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Wide band simultaneous multi-frequency single pulse study of PSR J1822–2256 with upgraded GMRT

Published online by Cambridge University Press:  04 June 2018

Bhal Chandra Joshi
National Centre for Radio Astrophysics (TIFR), Postbag No 3, Ganeshkhind, PuneINDIA email:
Arun Naidu
Mcgill Space Institute, McGill University, MontrealCanada
Vishal Gajjar
Space Science Laboratory, University of California, BerkeleyUSA
Geoffrey A. E. Wright
Jodrell Bank Centre for Astrophysics, University of ManchesterUK
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We present simultaneous multi-frequency observations of PSR J1822–2256 for the first time, utilizing the unique capabilities of upgraded Giant Meterwave Radio Telescope (uGMRT). No emission is detected in about 10 % of pulses. At least two drift modes and a possibly third rare mode, occur for 66, 21 and 2 % pulses respectively (P3 ~ 17, 7.5 and 5 P0 respectively). The three drift modes and the nulls occur concurrently from 250 to 1500 MHz. Modal average profiles are distinct with their widths increasing with drift rate. These sub-pulse drift related profile mode-changes can provide independent probes of beam geometry and polar gap physics.

Contributed Papers
Copyright © International Astronomical Union 2018 


Gajjar, V., Joshi, B. C., & Kramer, M., 2012, MNRAS, 424, 1197Google Scholar
Gajjar, V., Joshi, B. C., Kramer, M., Karuppusamy, R., & Smits, R. 2014, ApJ, 797, 18Google Scholar
Gupta, Y., et al. 2017, Current Science, 113, 707Google Scholar
Joshi, B. C., 2013, Proc. IAU Symp., 291, 414Google Scholar
van Leeuwen, J., & Timokhin, A. N., 2012, ApJ, 752, 155CrossRefGoogle Scholar
Lyne, A., Hobbs, G., Kramer, M., Stairs, I., & Stappers, B., 2010, Science, 329, 408Google Scholar
Naidu, A., Joshi, B. C., Manoharan, P. K., & Krishnakumar, M. 2017, A&A, 604, A45Google Scholar
Rankin, J., Wright, G., & Brown, A., 2013, MNRAS, 433, 445Google Scholar
Ruderman, M. A., & Sutherland, P. G., 1975, ApJ, 196, 51Google Scholar
Timokhin, A. N., 2010, MNRAS, 408, L41CrossRefGoogle Scholar
Vivekanand, M., & Joshi, B. C., 1997, ApJ, 477, 431CrossRefGoogle Scholar
Wen, Z. G. et al. 2016, A&A, 592, A127Google Scholar
Wright, G. A., & Fowler, L. A., 1981, A&A, 101, 356Google Scholar