RADIO PHYSICS AND RADIO ASTRONOMY

Purpose: Due to the significant increase of a number of pulsars discovered with high-frequency radio telescopes over the last ten years and the necessity to obtain accurate parameters of their decameter radiation (as well as to identify single pulses detected with the UTR-2), the second decameter census of these sources with the UTR-2 radio telescope became needed.

Design/methodology/approach: Single pulses detected as a result of the first decameter survey of pulsars and transient emission sources can be anomalously intense pulses of the recently discovered pulsars. Identification is only possible with an accurate information on the dispersion measure (DM) of each of these sources. Given that the new pulsars are likely to have a low radiant flux density, in contrast to the first decameter pulsar census [1], the second one plans to increase the signal-to-noiseratio by increasing the observation time of each pulsar. This paper gives a complete list of the studied sources, limited by the dispersion measure (DM< 30 pc·cm-³), period (P> 0.1 s) and declination (δ>-10º), known for the beginning of 2020, as well as some examples of the decameter pulsar radio emission detected by means of pipeline data processing with the possibility of flexible adjustment of search parameters.

Findings: For the first time in the low-frequency wavelength range, the radio emission from the PSR J2325-0530, PSR J0613+3731, and PSR J1426+52 pulsars has been detected. The main result of present work is specified period for the latter pulsar (PSR J1426+52), being 0.995866 s ± 5 µs, the other parameters of its radio emission are also specified.

Conclusions: High sensitivity of the UTR-2 radio telescope, its receiving equipment and efficient data processing and analysis pipeline allow detecting the decameter radiation of weak pulsars, as well as obtaining their parameters with the accuracy sufficient for identification of previously discovered transient signals.

Key words: pulsar, census, decameter wavelengths, pulsar period, flux, dispersion measure, UTR-2

Manuscript submitted 27.07.2020

Radio phys. radio astron. 2020, 25(3): 193-210

REFERENCES

1. HEWISH, A., BELL, S. J., PILKINGTON, J. D. H., SCOTT, P. F. and COLLINS, R. A., 1968. Observation of a rapidly pulsating radio source. Nature. vol. 217, pp. 709–713. DOI: https://doi.org/10.1038/217709a0

2. BAILES, M., JAMESON, A., FLYNN, C., BATEMAN, T., BARR, E. D., BHANDARI, S., BUNTON, J. D., CALEB, M., CAMPBELL-WILSON, D., FARAH, W., GAENSLER, B., GREEN, A. J., HUNSTEAD, R. W., JANKOWSKI, F., KEANE, E. F., KRISHNAN, V. V., TARA, M., O’NEILL, M., OSLOWSKI, S., PARTHASARATHY, A. R. V., ROSADO, P. and TEMBY, D., 2017. The UTMOST: A Hybrid Digital Signal Processor Transforms the Molonglo Observatory Synthesis Telescope. Publ. Astron. Soc. Aust. vol. 34, id. e045. DOI: https://doi.org/10.1017/pasa.2017.39

3. KEANE, E. F., BHATTACHARYYA, B., KRAMER, M., STAPPERS, B. W., BATES, S. D., BURGAY, M., CHATTERJEE, S., CHAMPION, D. J., EATOUGH, R. P., HESSELS, J. W. T., JANSSEN, G., LEE, K. J, VAN LEEUWEN, J., MARGUERON, J., OERTEL, M., POSSENTI, A., RANSOM, S., THEUREAU, G. and TORNE, P., 2014. A Cosmic Census of Radio Pulsars with the SKA. In: Advancing Astrophysics with the Square Kilometre Array (AASKA14) Conference Proceedings. (June 9-13, 2014. Giardini Naxos). Giardini Naxos, Italy. id. PoS (AASKA14)040. DOI: 0.22323/1.215.0040

4. STOVALL, K., RAY, P. S., BLYTHE, J., DOWELL, J., EFTEKHARI, T., GARCIA, A., LAZIO, T. J. W., MCCRACKAN, M., SCHINZEL, F. K. and TAYLOR, G. B., 2015. Pulsar Observations Using the First Station of the Long Wavelength Array and the LWA Pulsar Data Archive. Astrophys. J. vol. 808, is. 2, id. 156. DOI: https://doi.org/10.1088/0004-637X/808/2/156

5. ZARKA, P., TAGGER, M., DENIS, L., GIRARD, J. N., KONOVALENKO, A., ATEMKENG, M., ARNAUD, M., AZARIAN, S., BARSUGLIA, M., BONAFEDE, A., BOONE, F., BOSMA, A., BOYER, R., BRANCHESI, M., BRIAND, C., CECCONI, B., CÉLESTIN, S., CHARRIER, D., CHASSANDE-MOTTIN, E., COFFRE, A., COGNARD, I., COMBES, F., CORBEL, S., COURTE, C., DABBECH, A., DAIBOO, S., DALLIER, R., DUMEZVIOU, C., EL KORSO, M. N., FALGARONE, E., FALKOVYCH, I., FERRARI, A., FERRARI, C., FERRIÈ-RE, K., FEVOTTE, C., FIALKOV, A., FULLEKRUG, M., GÉRARD, E., GRIEßMEIER, J.-M., GUIDERDONI, B., GUILLEMOT, L., HESSELS, J., KOOPMANS, L., KONDRATIEV, V., LAMY, L., LANZ, T., LARZABA, P., LEHNERT, M., LEVRIER, F., LOH, A., MACARIO, G., MAINTOUX, J.-J., MARTIN, L., MARY, D., MASSON, S., MIVILLE-DESCHENES, M.-A., OBEROI, D., PANCHENKO, M., PANDEY-POMMIER, M., PETITEAU, A., PINÇON, J.-L., REVENU, B., RIBLE, F., RICHARD, C., RUCKER, H. O., SALOMÉ, P., SEMELIN, B., SERYLAK, M., SMIRNOV, O., STAPPERS, B., TAFFOUREAU, C., TASSE, C., THEUREAU, G., TOKARSKY, P., TORCHINSKY, S., ULYANOV, O., VAN DRIEL, W., VASYLIEVA, I., VAUBAILLON, J., VAZZA, F., VERGANI, S., WAS, M., WEBER, R. and ZAKHARENKO, V., 2015. NenuFAR: Instrument description and science case. In: 2015 International Conference on Antenna Theory and Techniques (ICATT). Kharkiv, Ukraine, pp. 1–6. DOI: https://doi.org/10.1109/ICATT.2015.7136773

6. SANIDAS, S., COOPER, S., BASSA, C. G., HESSELS, J. W. T., KONDRATIEV, V. I., MICHILLI, D., STAPPERS, B. W., TAN, C. M., VAN LEEUWEN, J., CERRIGONE, L., FALLOWS, R. A, IACOBELLI, M., ORRU, E., PIZZO, R. F., SHULEVSKI, A., TORIBIO, M. C., TER VEEN, S., ZUCCA, P., BONDONNEAU, L., GRIEßMEIER, J.-M., KARASTERGIOU, A., KRAMER, M. and SOBEY, C., 2019. The LOFAR Tied-Array All-Sky Survey (LOTAAS): Survey overview and initial pulsar discoveries. Astron. Astrophys. vol. 626, id. A104. DOI: https://doi.org/10.1051/0004-6361/201935609

7. KAWASH, A. M., MCLAUGHLIN, M. A., KAPLAN, D. L., DECESAR, M. E., LEVIN, L., LORIMER, D. R., LYNCH, R. S., STOVALL, K., SWIGGUM, J. K., FONSECA, E., ARCHIBALD, A. M., BANASZAK, S., BIWER, C. M., BOYLES, J., CUI, B., DARTEZ, L. P., DAY, D., ERNST, S., FORD, A. J., FLANIGAN, J., HEATHERLY, S. A., HESSELS, J. W. T., HINOJOSA, J., JENET, F. A., KARAKO-ARGAMAN, C., KASPI, V. M., KONDRATIEV, V. I., LEAKE, S., LUNSFORD, G., MARTINEZ, J. G., MATA, A., MATHENY, T. D., MCEWEN, A. E., MINGYAR, M. G., ORSINI, A. L., RANSOM, S. M., ROBERTS, M. S. E., ROHR, M. D., SIEMENS, X., SPIEWAK, R., STAIRS, I. H., VAN LEEUWEN, J., WALKER, A. N. and WELLS, B. L., 2018. The Green Bank Northern Celestial Cap Pulsar Survey. II. The Discovery and Timing of 10 Pulsars. Astrophys. J. vol. 857, is. 2, id. 131. DOI: https://doi.org/10.3847/1538-4357/aab61d

8. KONOVALENKO, A., SODIN, L., ZAKHARENKO, V., ZARKA, P., ULYANOV, O., SIDORCHUK, M., STEPKIN, S., TOKARSKY, P., MELNIK, V., KALINICHENKO, N., STANISLAVSKY, A., KOLIADIN, V., SHEPELEV, V., DOROVSKYY, V., RYABOV, V., KOVAL, A., BUBNOV, I., YERIN, S., GRIDIN, A., KULISHENKO, V., REZNICHENKO, A., BORTSOV, V., LISACHENKO, V., REZNIK, A., KVASOV, G., MUKHA, D., LITVINENKO, G., KHRISTENKO, A., SHEVCHENKO, V. V., SHEVCHENKO, V. A., BELOV, A., RUDAVIN, E., VASYLIEVA, I., MIROSHNICHENKO, A., VASILENKO, N., OLYAK, M., MYLOSTNA, K., SKORYK, A., SHEVTSOVA, A., PLAKHOV, M., KRAVTSOV, I., VOLVACH, Y., LYTVINENKO, O., SHEVCHUK, N., ZHOUK, I., BOVKUN, V., ANTONOV, A., VAVRIV, D., VINOGRADOV, V., KOZHIN, R., KRAVTSOV, A., BULAKH, E., KUZIN, A., VASILYEV, A., BRAZHENKO, A., VASHCHISHIN, R., PYLAEV, O., KOSHOVYY, V., LOZINSKY, A., IVANTYSHIN, O., RUCKER, H. O., PANCHENKO, M., FISCHER, G., LECACHEUX, A., DENIS, L., COFFRE, A., GRIEßMEIER, J.-M., TAGGER, M., GIRARD, J., CHARRIER, D., BRIAND, C. and MANN, G., 2016. The modern radio astronomy network in Ukraine: UTR-2, URAN and GURT. Exp. Astron. vol. 42, is. 1, pp. 11–48. DOI: https://doi.org/10.1007/s10686-016-9498-x

9. ZAKHARENKO, V., KONOVALENKO, A., ZARKA, P., ULYANOV, O., SIDORCHUK, M., STEPKIN, S., KOLIADIN, V., KALINICHENKO, N., STANISLAVSKY, A., DOROVSKYY, V., SHEPELEV, V., BUBNOV, I., YERIN, S., MELNIK, V., KOVAL, A., SHEVCHUK, N., VASYLIEVA, I., MYLOSTNA, K., SHEVTSOVA, A., SKORYK, A., KRAVTSOV, I., VOLVACH, Y., PLAKHOV, M., VASILENKO, N., VASYLKIVSKYI, Y., VAVRIV, D., VINOGRADOV, V., KOZHIN, R., KRAVTSOV, A., BULAKH, E., KUZIN, A., VASILYEV, A., RYABOV, V., REZNICHENKO, A., BORTSOV, V., LISACHENKO, V., KVASOV, G., MUKHA, D., LITVINENKO, G., BRAZHENKO, A., VASHCHISHIN, R., PYLAEV, O., KOSHOVYY, V., LOZINSKY, A., IVANTYSHIN, O., RUCKER, H. O., PANCHENKO, M., FISCHER, G., LECACHEUX, A., DENIS, L., COFFRE, A. and GRIEßMEIER, J.-M., 2016. Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT. J. Astron. Instrum. vol. 5, is. 4, id. 1641010-738. DOI: https://doi.org/10.1142/S2251171716410105

10. ZAKHARENKO, V. V., VASYLIEVA, I. Y., KONOVALENKO, A. A., ULYANOV, O. M., SERYLAK, M., ZARKA, P., GRIEßMEIER, J.-M., COGNARD, I. and NIKOLAENKO, V. S., 2013. Detection of decametre-wavelength pulsed radio emission of 40 known pulsars. Mon. Not. R. Astron. Soc. vol. 431, is. 4, pp. 3624–3641. DOI: https://doi.org/10.1093/mnras/stt470

11. KRAVTSOV, I. P., 2018. Survey of the Northern sky in order to find sporadic radio emission sources in decametre wave range. PhD thesis ed. Kharkiv, Ukraine, Institute of Radio Astronomy of NAS of Ukraine, V. N. Karazin Kharkiv National University. (in Ukrainian).

12. ZAKHARENKO, V. V., KRAVTSOV, I. P., VASYLIEVA, I. Y., KONOVALENKO, A. A., ULYANOV, O. M. and KOLYADIN, V. L., 2018. Search for Low-Intensity Interference and Distributions of Transient Signals’ Characteristics in the Data of Decameter Survey of Northern Sky. Radio Phys. Radio Astron. vol. 23, no. 2, pp. 79–93. (in Russian). DOI: https://doi.org/10.15407/rpra23.02.079

13. ZAKHARENKO, V. V., KRAVTSOV, I. P. and VASYLIEVA, I. Y., 2017. Decameter Pulsar/Transient Survey of Northen Sky. Parameters of Individual Pulses. Radio Phys. Radio Astron. vol. 22, no. 1, pp. 31–44. (in Russian). DOI: https://doi.org/10.15407/rpra22.01.031

14. KRAVTSOV, I. P., ZAKHARENKO, V. V., VASYLIEVA, I. Y., MYKHAILOVA, S. S., ULYANOV, O. M., SHEVTSOVA, A. I. and SKORYK, A. O., 2016. Parameters of the transient signals detected in the decameter survey of the Northern sky. Odessa Astronomical Publications. vol. 29, pp. 179–183. DOI: https://doi.org/10.18524/1810-4215.2016.29.85210

15. VASYLIEVA, I. Y., 2015. Pulsars and transients survey, and exoplanet search at low-frequencies with the UTR-2 radio telescope: methods and first results [online]. PhD thesis ed. Observatoire de Paris [viewed 19 April 2018]. Available from: https://tel.archives-ouvertes.fr/tel-01246634

16. ZAKHARENKO, V. V., KRAVTSOV, I. P., VASYLIEVA, I. Y., MYKHAILOVA, S. S., ULYANOV, O. M., SHEVTSOVA, A. I., SKORYK, A. O., ZARKA, P. and KONOVALENKO, O. O., 2015. Decameter Pulsars and Transients Survey of the Northern Sky. Status, First Results, Multiparametric Pipeline for Candidate Selection. Odessa Astronomical Publications. vol. 28, is. 2, pp. 252–255. DOI: https://doi.org/10.18524/1810-4215.2015.28.71047

17. KRAVTSOV, I. P., ZAKHARENKO, V. V., VASYLIEVA, I. Y., MYKHAILOVA, S. S., ULYANOV, O. M., SHEVTSOVA, A. I., SKORYK, A. O., ZARKA, P. and KONOVALENKO, O. O., 2016. Search for Transient Signals in the Data of Decameter Survey of Northern Sky. Adv. Astron. Space Phys. vol. 6, is. 2, pp. 79–84. DOI: https://doi.org/10.17721/2227-1481.6.79-84

18. KRAVTSOV, I. P., ZAKHARENKO, V. V., VASYLIEVA, I. Y., ULYANOV, O. M., SHEVTSOVA, A. I., SKORYK, A. O. and MYKHAILOVA, S. S., 2016. Decameter Pulsars and Transients Survey of the Northern Sky. Observations and Data Processing. In: 9th International Kharkiv Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves MSMW’2016. Kharkiv, Ukraine. DOI: https://doi.org/10.1109/MSMW.2016.7538020

19. KRAVTSOV, I. P., ZAKHARENKO, V. V., VASYLIEVA, I. Y., ULYANOV, O. M., SHEVTSOVA, A. I., SKORYK A. O. and MYKHAILOVA, S. S., 2017. Analysis of the Transient Signals in Decameter Survey of the Northern Sky. In: 2017 IEEE International Young Scientists Forum on Applied Physics and Engineering YSF-2017 Proceedings. [CD-ROM]. Lviv, Ukraine. id. MWA-7.

20. CAMILO, F. and NICE, D. J., 1995. Timing Parameters of 29 Pulsars. Astrophys. J. vol. 445, no. 2, pp. 756–761. DOI: https://doi.org/10.1086/175737

21. DENEVA, J. S., STOVALL, K., MCLAUGHLIN, M. A., BAGCHI, M., BATES, S. D., FREIRE, P. C. C., MARTINEZ, J. G., JENET, F. and GARVER-DANIELS, N., 2016. New Discoveries from the Arecibo 327 MHz Drift Pulsar Survey Radio Transient Search. Astrophys. J. vol. 821, no. 1, id. 10. DOI: https://doi.org/10.3847/0004-637X/821/1/10

22. LARGE, M. I., VAUGHAN, A. E. and WIELEBINSKI, R., 1969. Highly Dispersed Pulsar and Three Others. Nature. vol. 223, pp. 1249–1250. DOI: https://doi.org/10.1038/2231249a0

23. SAYER, R. W., NICE, D. J. and TAYLOR, J. H., 1997. The Green Bank Northern Sky Survey for Fast Pulsars. Astrophys. J. vol. 474, no. 1, pp. 426–432. DOI: https://doi.org/10.1086/303446

24. HESSELS, J. W. T., RANSOM, S. M., KASPI, V. M., ROBERTS, M. S. E., CHAMPION, D. J. and STAPPERS, B. W., 2008. The GBT350 Survey of the Northern Galactic Plane for Radio Pulsars and Transients. In: C. BASSA, Z. WANG, A. CUMMING, V. M. KASPI, eds. 40 Years of Pulsars: Millisecond Pulsars, Magnetars and More. New York: AIP Publ., pp. 613–615. DOI: https://doi.org/10.1063/1.2900310

25. DEWEY, R. J., TAYLOR, J. H., WEISBERG, J. M. and STOKES, G. H., 1985. A search for low-luminosity pulsars. Astrophys. J. vol. 294, pp. L25–L29. DOI: https://doi.org/10.1086/184502

26. LORIMER, D. R., XILOURIS, K. M., FRUCHTER, A. S., STAIRS, I. H., CAMILO, F., VAZQUEZ, A. M., EDER, J. A., MCLAUGHLIN, M. A., ROBERTS, M. S. E., HESSELS, J. W. T. and RANSOM, S. M., 2005. Discovery of 10 pulsars in an Arecibo drift-scan survey. Mon. Not. R. Astron. Soc. vol. 359, is. 4, pp. 1524–1530. DOI: https://doi.org/10.1111/j.1365-2966.2005.09005.x

27. TYUL’BASHEV, S. A., TYUL’BASHEV, V. S., MALOFEEV, V. M., LOGVINENKO, S. V., ORESHKO, V. V., DAGKESAMANSKII, R. D., CHASHEI, I. V., SHISHOV, V. I. and BURSOV, N. N., 2018. Detection of Five New RRATs at 111 MHz. Astron. Rep. vol. 62, is. 1, pp. 63–71. DOI: https://doi.org/10.1134/S1063772918010079

28. TYUL’BASHEV, S. A., TYUL’BASHEV, V. S., ORESHKO, V. V. and LOGVINENKO, S. V., 2016. Detection of new pulsars at 111 MHz. Astron. Rep. vol. 60, pp. 220–232. DOI: https://doi.org/10.1134/S1063772916020128

29. MANCHESTER, R. N., LYNE, A. G., TAYLOR, J. H., DURDIN, J. M., LARGE, M. I. and LITTLE, A. G., 1978. The second Molonglo pulsar survey – discovery of 155 pulsars. Mon. Not. R. Astron. Soc. vol. 185, is. 2, pp. 409–421. DOI: https://doi.org/10.1093/mnras/185.2.409

30. CHAMPION, D. J., LORIMER, D. R., MCLAUGHLIN, M. A., XILOURIS, K. M., ARZOUMANIAN, Z., FREIRE, P. C. C., LOMMEN, A. N., CORDES, J. M. and CAMILO, F., 2005. Arecibo timing and single-pulse observations of 17 pulsars. Mon. Not. R. Astron. Soc. vol. 363, is. 3, pp. 929–936. DOI: https://doi.org/10.1111/j.1365-2966.2005.09499.x

31. DENEVA, J. S., STOVALL, K., MCLAUGHLIN, M. A., BATES, S. D., FREIRE, P. C. C., MARTINEZ, J. G., JENET, F. and BAGCHI, M., 2013. Goals, Strategies and First Discoveries of AO327, the Arecibo All-sky 327 MHz Drift Pulsar Survey. Astrophys. J. vol. 775, is. 1, id. 51. DOI: https://doi.org/10.1088/0004-637X/775/1/51

32. KARAKO-ARGAMAN, C., KASPI, V. M., LYNCH, R. S., HESSELS, J. W. T., KONDRATIEV, V. I., CLAUGHLIN, M. A., RANSOM, S. M., ARCHIBALD, A. M., BOYLES, J., JENET, F. A., KAPLAN, D. L., LEVIN, L., LORIMER, D. R., MADSEN, E. C., ROBERTS, M. S. E., SIEMENS, X., STAIRS, I. H., STOVALL, K., SWIGGUM, J. K. and VAN LEEUWEN, J., 2015. Discovery and Follow-up of Rotating Radio Transients with the Green Bank and LOFAR Telescopes. Astrophys. J. Vol. 809, no. 1, id. 67. DOI: https://doi.org/10.1088/0004-637X/809/1/67

33. ASTRON., 2020. LOTAAS non-confirmed (yet) candidates. LOTAAS Pulsar Discoveries – 74 (LOFAR pulsar to Available from: https://www.astron.nl/lotaas/index.php?sort=0&order=0

34. BONSIGNORI-FACONDI, S. R., SALTER, C. J. and SUTTON, J. M., 1973. The Bologna 408 MHz Pulsar Search. Astron. Astrophys. vol. 27, no. 1, pp. 67–71.

35. TYUL’BASHEV, S. A., TYUL’BASHEV, V. S. and MALOFEEV, V. M., 2018. Detection of 25 new rotating radio transients at 111 MHz. Astron. Astrophys. vol. 618, id. A70. DOI: https://doi.org/10.1051/0004-6361/201833102

36. DAMASHEK, M., TAYLOR, J. H. and HULSE, R. A., 1978. Parameters of 17 newly discovered pulsars in the northern Sky. Astrophys. J. vol. 225, pp. L31–L33. DOI: https://doi.org/10.1086/182786

37. COLE, T. W. and PILKINGTON, J. D. H., 1968. Search for Pulsating Radio Sources in the Declination Range +44°<d<+90°. Nature. vol. 219, pp. 574–576. DOI: https://doi.org/10.1038/219574a0

38. MICHILLI, D., HESSELS, J. W. T., LYON, R. J., TAN, C. M., BASSA, C., COOPER, S., KONDRATIEV, V. I., SANIDAS, S., STAPPERS, B. W. and VAN LEEUWEN, J., 2018. Single-pulse classifier for the LOFAR Tied-Array All-sky Survey. Mon. Not. R. Astron. Soc. vol. 480, is. 3, pp. 3457–3467. DOI: https://doi.org/10.1093/mnras/sty2072

39. MANCHESTER, R. N., LYNE, A. G., D’AMICO, N., BAILES, M., JOHNSTON, S., LORIMER, D. R., HARRISON, P. A., NICASTRO, L. and BELL, J. F., 1996. The Parkes Southern pulsar Survey – I. Observing and data analysis systems and initial results. Mon. Not. R. Astron. Soc. vol. 279, is. 4, pp. 1235–1250. DOI: https://doi.org/10.1093/mnras/279.4.1235

40. CHANDLER, A. M., 2003. Pulsar searches: from radio to gamma-rays. Dissertation [online]. PhD thesis ed. California Institute of Technology [viewed 14 August 2020]. DOI: 10.7907/MDJX-M255 Available from: https://resolver.caltech.edu/CaltechETD:etd-01232003-213508

41. STOKES, G. H., TAYLOR, J. H., WEISBERG, J. M. and DEWEY, R. J., 1985. A survey for short-period pulsars. Nature. vol. 317, pp. 787–788. DOI: https://doi.org/10.1038/317787a0

42. COENEN, T., VAN LEEUWEN, J., HESSELS, J. W. T., STAPPERS, B. W., KONDRATIEV, V. I., ALEXOV, A., BRETON, R. P., BILOUS, A., COOPER, S., FALCKE, H., FALLOWS, R. A., GAJJAR, V., GRIEßMEIER, J.-M., HASSALL, T. E., KARASTERGIOU, A., KEANE, E. F., KRAMER, M., KUNIYOSHI, M., NOUTSOS, A., OSŁOWSKI, S., PILIA, M., SERYLAK, M., SCHRIJVERS, C., SOBEY, C., TER VEEN, S., VERBIEST, J., WELTEVREDE, P., WIJNHOLDS, S., ZAGKOURIS K., VAN AMESFOORT, A. S., ANDERSON, J., ASGEKAR, A., AVRUCH, I. M, BELL, M. E., BENTUM, M. J., BERNARDI, G., BEST, P., BONAFEDE, A., BREITLING, F., BRODERICK, J., BRÜGGEN, M., BUTCHER, H. R., CIARDI, B., CORSTANJE, A., DELLER, A., DUSCHA, S., EISLÖFFEL, J., M., FENDER, R., FERRARI, C., FRIESWIJK, W., GARRETT, M. A., DE GASPERIN, F., DE GEUS, E., GUNST, A. W., HAMAKER, J. P., HEALD, G., HOEFT, M., VAN DER HORST, A., JUETTE, E., KUPER, G., LAW, C., MANN, G., MCFADDEN, R., MCKAY-BUKOWSKI, D., MCKEAN, J. P., MUNK, H., ORRU, E., PAAS, H., PANDEY-POMMIER, M., POLATIDIS, A. G., REICH, W., RENTING, A., RÖTTGERING, H., ROWLINSON, A., SCAIFE, A. M. M., SCHWARZ, D., SLUMAN, J., SMIRNOV, O., SWINBANK J., TAGGER, M., TANG Y., TASSE, C., THOUDAM, S., TORIBIO, C., VERMEULEN, R., VOCKS, C., VAN WEEREN, R. J., WUCKNITZ, O., ZARKA, P. and ZENSUS, A. 2014. The LOFAR pilot surveys for pulsars and fast radio transients. Astron. Astrophys. vol. 570, id. A60. DOI: https://doi.org/10.1051/0004-6361/201424495

43. HALPERN, J. P. and HOLT, S. S., 1992. Discovery of soft X-ray pulsations from the g-ray source Geminga. Nature. vol. 357, pp. 222–224. DOI: https://doi.org/10.1038/357222a0

44. STOVALL, K., LYNCH, R. S., RANSOM, S. M., ARCHIBALD, A. M., BANASZAK, S., BIWER, C. M., BOYLES, J., DARTEZ, L. P., DAY, D., FORD, A. J., FLANIGAN, J., GARCIA, A., HESSELS, J. W. T., HINOJOSA, J., JENET, F. A., KAPLAN, D. L., KARAKO-ARGAMAN, C., KASPI, V. M., KONDRATIEV, V. I., LEAKE, S., LORIMER, D. R., LUNSFORD, G., MARTINEZ, J. G., MATA, A., MCLAUGHLIN, M. A., ROBERTS, M. S. E., ROHR, M. D., SIEMENS, X., STAIRS, I. H., VAN LEEUWEN, J., WALKER, A. N. and WELLS, B. L., 2014. The Green Bank Northern Celestial Cap Pulsar Survey. I. Survey Description, Data Analysis, and Initial Results. Astrophys. J. vol. 791, is. 1, id. 67. DOI: https://doi.org/10.1088/0004-637X/791/1/67

45. ANDREWS, J. J., AGÜEROS, M. A., CAMILO, F., KILIC, M., GIANNINAS, A., BROWN, W. and HEINKE, C., 2018. A Serendipitous Pulsar Discovery in a Search for a Companion to a Low-mass White Dwarf. Res. Notes AAS. vol. 2, no. 2, id. 60. DOI: https://doi.org/10.3847/2515-5172/aacd04

46. TYUL’BASHEV, S. A., TYUL’BASHEV, V. S., KITAEVA, M. A., CHERNYSHOVA, A. I., MALOFEEV, V. M., CHASHEI, I. V., SHISHOV, V. I., DAGKESAMANSKII, R. D., KLIMENKO, S. V., NIKITIN, I. N. and NIKITINA, L. D., 2017. Search for and detection of pulsars inmonitoring observations at 111 MHz. Astron. Rep. vol. 61, is. 10, pp. 848–858. DOI: https://doi.org/10.1134/S1063772917100109

47. CRAFT, H. D., LOVELACE, R. V. E. and SUTTON, J. M., 1968. New pulsar. IAU Circ. no. 2100.

48. PILKINGTON, J. D. H., HEWISH, A., BELL, S. J. and COLE, T. W., 1968. Observations of some further Pulsed Radio Sources. Nature. vol. 218, pp. 126–129. DOI: https://doi.org/10.1038/218126a0

49. RAY, P. S., THORSETT, S. E., JENET, F. A., VAN KERKWIJK, M. H., KULKARNI, S. R., PRINCE, T. A., SANDHU, J. S. and NICE, D. J., 1996. A Survey for Millisecond Pulsars. Astrophys. J. vol. 470, pp. 1103–1110. DOI: https://doi.org/10.1086/177934

50. THORSETT, S. E., DEICH, W. T. S., KULKARNI, S. R., NAVARRO, J. and VASISHT, G., 1993. A search for pulsars at high Galactic latitudes. Astrophys. J. vol. 416, pp. 182–184. DOI: https://doi.org/10.1086/173224

51. VITKEVICH, V. V., ALEKSEEV, YU. I., ZHURAVLEV, V. F. and SHITOV, YU. P., 1969. Pulsar PP 0943. Nature. vol. 224, p. 49. DOI: https://doi.org/10.1038/224049a0

52. MORELLO, V., BARR, E. D., COOPER, S., BAILES, M., BATES, S., BHAT, N. D. R., BURGAY, M., BURKE SPOLAOR, S., CAMERON, A. D., CHAMPION, D. J., EATOUGH, R. P., FLYNN, C. M. L., JAMESON, A., JOHNSTON, S., KEITH, M. J., KEANE, E. F., KRAMER, M., LEVIN, L., NG, C., PETROFF, E., POSSENTI, A., STAPPERS, B. W., VAN STRATEN, W. and TIBURZI, C., 2019. The High Time Resolution Universe survey – XIV. Discovery of 23 pulsars through GPU-accelerated reprocessing. Mon. Not. R. Astron. Soc. vol. 483, is. 3, pp. 3673–3685. DOI: https://doi.org/10.1093/mnras/sty3328

53. BURGAY, M., JOSHI, B. C., D’AMICO, N., POSSENTI, A., LYNE, A. G., MANCHESTER, R. N., MCLAUGHLIN, M. A., KRAMER, M., CAMILO, F. and FREIRE, P. C. C., 2006. The Parkes High-Latitude pulsar survey. Mon. Not. R. Astron. Soc. vol. 368, is. 1, pp. 283–292. DOI: https://doi.org/10.1111/j.1365-2966.2006.10100.x

54. ASTRON., 2020. LOFAR targeted searches for pulsars. LOTAAS Pulsar Discoveries – 74 (LOFAR pulsar total – 81). [online table]. [viewed 14 August 2020]. Available from: https://www.astron.nl/lotaas/index.php?sort=0&order=0

55. LANG, K. R., 1969. Periodic Variations in Pulsar Radiation Intensity. Astrophys. J. vol. 158, no. 3, pp. L175–L177. DOI: https://doi.org/10.1086/180459

56. LOMMEN, A. N., ZEPKA, A., BACKER, D. C., MCLAUGHLIN, M., CORDES, J. M., ARZOUMANIAN, Z. and XILOURIS, K., 2000. New Pulsars from an Arecibo Drift Scan Search. Astrophys. J. vol. 545, no. 2, pp. 1007–1014. DOI: https://doi.org/10.1086/317841

57. DAMASHEK, M., BACKUS, P. R., TAYLOR, J. H. and BURKHARDT, R. K., 1982. Northern Hemisphere Pulsar Survey: A Third Radio Pulsar in a Binary System. Astrophys. J. vol. 253, pp. L57–L60. DOI: https://doi.org/10.1086/183736

58. LYNCH, R. S., BOYLES, J., RANSOM, S. M., STAIRS, I. H., LORIMER, D. R., MCLAUGHLIN, M. A., HESSELS, J. W. T., KASPI, V. M., KONDRATIEV, V. I., ARCHIBALD, A. M., BERNDSEN, A., CARDOSO, R. F., CHERRY, A., EPSTEIN, C. R., KARAKO-ARGAMAN, C., MCPHEE, C. A., PENNUCCI, T., ROBERTS, M. S. E., STOVALL, K. and VAN LEEUWEN, J., 2013. The Green Bank Telescope 350 MHz Drift-scan Survey II: Data Analysis and the Timing of 10 New Pulsars, Including a Relativistic Binary. Astrophys. J. vol. 763, no. 2, id. 81. DOI: https://doi.org/10.1088/0004-637X/763/2/81

59. HUGUENIN, G. R., TAYLOR, J. H., GOAD, L. E., HARTAI, A., ORSTEN, G. S. F. and RODMAN, A. K., 1968. New Pulsating Radio Source. Nature. vol. 219, pp. 576–577. DOI: https://doi.org/10.1038/219576a0

60. FOSTER, R. S., CADWELL, B. J., WOLSZCZAN, A. and ANDERSON, S. B., 1995. A High Galactic Latitude Pulsar Survey of the Arecibo Sky. Astrophys. J. vol. 454, pp. 826–830. DOI: https://doi.org/10.1086/176535

61. BOYLES, J., LYNCH, R. S., RANSOM, S. M., STAIRS, I. H., LORIMER, D. R., MCLAUGHLIN, M. A., HESSELS, J. W. T., KASPI, V. M., KONDRATIEV, V. I., ARCHIBALD, A., BERNDSEN, A., CARDOSO, R. F., CHERRY, A., EPSTEIN, C. R., KARAKO-ARGAMAN, C., MCPHEE, C. A., PENNUCCI, T., ROBERTS, M. S. E., STOVALL, K. and VAN LEEUWEN, J., 2013. The Green Bank Telescope 350 MHz Drift-scan Survey. I. Survey Observations and the Discovery of 13 Pulsars. Astrophys. J. vol. 763, no. 2, id. 80. DOI: https://doi.org/10.1088/0004-637X/763/2/80

62. VAUGHAN, A. E. and LARGE, M. I., 1970. Five New Pulsars. Nature. vol. 225, pp. 167–168. DOI: https://doi.org/10.1038/225167a0

63. SHITOV, Y. P., KUZMIN, A. D., KUTZOV, S. M., ILYASOV, Y. P., ALEKSEEV, Y. I. and ALEKSEEV, I. A., 1980. New pulsars discovered at 3-m wavelength. Sov. Astron. Lett. vol. 6, p. 85–86.

64. MCLAUGHLIN, M., CORDES, J. M. and ARZOUMANIAN, Z., 2000. Searching for FAST Pulsars. Proc. Int. Astron. Union. vol. 177, pp. 41–42. DOI: https://doi.org/10.1017/S0252921100058966

65. LORIMER, D. R., FAULKNER, A. J., LYNE, A. G., MANCHESTER, R. N., KRAMER, M., MCLAUGHLIN, M. A., HOBBS, G., POSSENTI, A., STAIRS, I. H., CAMILO, F., BURGAY, M., D’AMICO, N., CORONGIU, A. and CRAWFORD, F., 2006. The Parkes Multibeam Pulsar Survey – VI. Discovery and timing of 142 pulsars and a Galactic population analysis. Mon. Not. R. Astron. Soc. vol. 372, is. 2, pp. 777–800. DOI: https://doi.org/10.1111/j.1365-2966.2006.10887.x

66. DAVIES, J. G., LYNE, A. G. and SEIRADAKIS, J. H., 1972. Pulsar Associated with the Supernova Remnant IC 443. Nature. vol. 240, pp. 229–230. DOI: https://doi.org/10.1038/240229a0

67. BURKE-SPOLAOR, S. and BAILES, M., 2010. The millisecond radio sky: transients from a blind single-pulse search. Mon. Not. R. Astron. Soc. vol. 402, is. 2, pp. 855–866. DOI: https://doi.org/10.1111/j.1365-2966.2009.15965.x

68. HOBBS, G., FAULKNER, A., STAIRS, I. H., CAMILO, F., MANCHESTER, R. N., LYNE, A. G., KRAMER, M., D’AMICO, N., KASPI, V. M., POSSENTI, A., MCLAUGHLIN, M. A., LORIMER, D. R., BURGAY, M., JOSHI, B. C. and CRAWFORD, F., 2004. The Parkes multibeam pulsar survey – IV. Discovery of 180 pulsars and parameters for 281 previously known pulsars. Mon. Not. R. Astron. Soc. vol. 352, is. 4, pp. 1439–1472. DOI: https://doi.org/10.1111/j.1365-2966.2004.08042.x

69. NICE, D. J., FRUCHTER, A. S. and TAYLOR, J. H., 1995. A search for fast pulsars along the Galactic plane. Astrophys. J. vol. 449, pp. 156–163. DOI: https://doi.org/10.1086/176041

70. NICE, D. J., 1999. Radio Pulses along the Galactic Plane. Astrophys. J. vol. 513, no. 2, pp. 927–932. DOI: https://doi.org/10.1086/306898

71. HULSE, R. A. and TAYLOR, J. H., 1974. A High-Sensitivity Pulsar Survey. Astrophys. J. vol. 191, pp. L59–L61. DOI: https://doi.org/10.1086/181548

72. LORIMER, D. R., CAMILO, F. and MCLAUGHLIN, M. A., 2013. Timing of pulsars found in a deep Parkes multibeam survey. Mon. Not. R. Astron. Soc. vol. 434, is. 1, pp. 347–351. DOI: https://doi.org/10.1093/mnras/stt1023

73. LARGE, M. I., VAUGHAN, A. E. and WIELEBINSKI, R., 1968. Pulsar Searches at the Molonglo Radio Observatory. Nature. vol. 220, pp. 753–756. DOI: https://doi.org/10.1038/220753a0

74. DAVIES, J. G., LARGE, M. I. and PICKWICK, A. C., 1970. Five New Pulsars. Nature. vol. 227, pp. 1123–1124. DOI: https://doi.org/10.1038/2271123a0

75. CRAFT, H. D., SUTTON, J. M., COMELLA, J. M. and LOVELARCE, R. V. E., 1968. New Pulsar in Vulpecula. Nature. vol. 219, pp. 1237–1238. DOI: https://doi.org/10.1038/2191237a0

76. DAVIES, J. G. and LARGE, M. I., 1970. A Single-Pulse Search for Pulsars. Mon. Not. R. Astron. Soc. vol. 149, is. 4, pp. 301–310. DOI: https://doi.org/10.1093/mnras/149.4.301

77. BRINKMAN, C., FREIRE, P. C. C., RANKIN, J. and STOVALL, K., 2018. No pulsar left behind – I. Timing, pulse-sequence polarimetry and emission morphology for 12 pulsars. Mon. Not. R. Astron. Soc. vol. 474, is. 2, pp. 2012–2027. DOI: https://doi.org/10.1093/mnras/stx2842

78. LEWANDOWSKI, W., WOLSZCZAN, A., FEILER, G., KONACKI, M. and SOŁTYSIŃSKI, T., 2004. Arecibo Timing and Single-Pulse Observations of Eighteen Pulsars. Astrophys. J. vol. 600, no. 2, pp. 905–913. DOI: https://doi.org/10.1086/379923

79. CAMILO, F., NICE, D. J. and TAYLOR, J. H., 1996. A Search for Millisecond Pulsars at Galactic Latitudes –50 degrees < B < –20 degrees. Astrophys. J. vol. 461, pp. 812–819. DOI: https://doi.org/10.1086/177103

80. CAMILO, F., NICE, D. J., SHRAUNER, J. A. and TAYLOR, J. H., 1996. Princeton-Arecibo Declination-Strip Survey for Millisecond Pulsars. I. Astrophys. J. vol. 469, pp. 819–827. DOI: https://doi.org/10.1086/177829

81. ALOISI, R. J., CRUZ, A., DANIELS, L., MEYERS, N., ROEKLE, R., SCHUETT, A., SWIGGUM, J. K., DECESAR, M. E., KAPLAN, D. L., LYNCH, R. S., STOVALL, K., LEVIN, L., ARCHIBALD, A. M., BANASZAK, S., BIWER, C. M., BOYLES, J., CHAWLA, P., DARTEZ, L. P., CUI, B., DAY, D. F., FORD, A. J., FLANIGAN, J., FONSECA, E., HESSELS, J. W. T., HINOJOSA, J., KARAKO-ARGAMAN, C., KASPI, V. M., KONDRATIEV, V. I., LEAKE, S., LUNSFORD, G., MARTINEZ, J. G., MATA, A., MCLAUGHLIN, M. A., AL NOORI, H., RANSOM, S. M., ROBERTS, M. S. E., ROHR, M. D., SIEMENS, X., SPIEWAK, R., STAIRS, I. H., VAN LEEUWEN, J., WALKER, A. N. and WELLS, B. L., 2019. The Green Bank North Celestial Cap Pulsar Survey. IV. Four New Timing Solutions. Astrophys. J. vol. 875, no. 1, id. 19. DOI: https://doi.org/10.3847/1538-4357/ab0d21

82. MANCHESTER, R. N., HOBBS, G. B., TEOH, A. and HOBBS, M., 2005. The Australia Telescope National Facility Pulsar Catalogue. Astrophys. J. vol. 129, no. 4, pp. 1993–2006. DOI: https://doi.org/10.1086/428488

83. CSIRO., 2020. ATNF Pulsar Catalogue. Australia Telescope National Facility. [online table]. [viewed 14 August 2020]. Available from: https://www.atnf.csiro.au/research/pulsar/psrcat/

84. SIDORCHUK, M. A., ULYANOV, O. M., SHEPELEV, V. A., MUKHA, D. V., BRAZHENKO, A. I., VASHCHISHIN, R. V. and FRANTZUSENKO, A. V., 2008. Largescale structure of the Northern sky at decametric waves. In: Scientific Workshop – Astrophysics with E-LOFAR [online]. [viewed 14 August 2020]. Available from: https://www.researchgate.net/publication/312367692_Largescale_structure_of_the_Northern_sky_at_decametric_waves DOI: 10.13140/RG.2.2.28090.82881