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

Glitch behavior of the pulsar B1822-09 in the range 0.1 - 2.3 GHz

T.V. Shabanova ¹ and J.O. Urama <sup>2,3

1</sup> Astro Space Center, P.N. Lebedev Physical Institute, 53 Leninskij Prospect, 117924 Moscow, Russia (tvsh@prao.psn.ru)
² Hartebeesthoek Radio Astronomy Observatory (HartRAO), P.O. Box 443, Krugersdorp 1740, South Africa (johnson@bootes.hartrao.ac.za)
³ Department of Physics & Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria

Received 28 May 1999 / Accepted 3 December 1999

Abstract

An analysis of four glitches observed in the pulsar B1822-09 during the period 1994 - 1999 is presented. The main distinguishing feature of these glitches is that the sudden increase in rotational frequency is accompanied by a decrease in the frequency derivative. The largest change of the frequency derivative was measured in the fourth glitch. This glitch occurred around MJD 51054 and was characterized by rather a small increase in rotational frequency of , but a large decrease in the frequency derivative by .

The first two glitches were observed practically simultaneously at two frequencies of 0.1 GHz in Pushchino, Russia and 1.6/2.3 GHz at HartRAO, South Africa. An analysis of the high- and low frequency timing data showed that glitches did not affect the pulse arrival times at different frequencies within 2 ms. Glitch signature was identical in the wide frequency range from 0.1 to 2.3 GHz.

In addition, a more exact value of the dispersion measure was measured to be 19.383(3) .

Key words: stars: neutron stars: pulsars: general stars: pulsars: individual: PSR B1822-09 stars: rotation

Send offprint requests to: T.V. Shabanova

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Contents

• 1. Introduction
• 2. Observations and data analysis
• 3. Results and discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: February 25, 2000
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