Astron. Astrophys. 354, 960-964 (2000)

1. Introduction

In 1994 and 1995 the pulsar B1822-09 underwent two glitches in its spin-down behavior and they had an unusual signature. These glitches were accompanied by a decrease in the magnitude of the frequency derivative, . Moreover, the frequency derivative after some relaxation time came back to its pre-glitch value. As a consequense, the observed post-glitch relaxation presented a continuous spin-up of the pulsar which lasted days (Shabanova 1998).

In this paper we continue to investigate the glitch behavior of the pulsar B1822-09. Two new glitches were detected on 1998 April 28 and 1998 August 30. Their signature was similar to that of the previous glitches - an increase in rotational frequency was accompanied by a decrease in the magnitude of the frequency derivative.

PSR B1822-09 is the first glitching pulsar to be observed practically simultaneously at widely separated frequencies of 0.1 and 2.3 GHz during seven years since 1991 March to 1998 May. It is shown that glitches did not affect the pulse arrival times at different observing frequencies within 2 ms. Glitch signature was identical in the wide frequency range from 0.1 to 2.3 GHz.

© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000
helpdesk.link@springer.de