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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 ,
Arun Naidu ,
Vishal Gajjar  and
Geoffrey A. E. Wright
Bhal Chandra Joshi
Affiliation:
National Centre for Radio Astrophysics (TIFR), Postbag No 3, Ganeshkhind, Pune INDIA email: bcj@ncra.tifr.res.in
Arun Naidu
Affiliation:
Mcgill Space Institute, McGill University, Montreal Canada
Vishal Gajjar
Affiliation:
Space Science Laboratory, University of California, Berkeley USA
Geoffrey A. E. Wright
Affiliation:
Jodrell Bank Centre for Astrophysics, University of Manchester UK
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Abstract

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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.

Keywords

pulsars: individual : PSR J1822–2256radiation mechanisms: general

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