Two classes of glitches in the pulsar B1822-09

Astronomy and Astrophysics – Astronomy

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97.60.Jd, 97.60.Gb, 97.10.Kc, 97.10.Sj

Scientific paper

A large glitch has been detected in the pulsar B1822-09 (J1825-0935) using the LPA antenna of the Pushchino Observatory. This glitch occurred on January 15, 2007 and had a relative amplitude of Δ ν/ν ˜ 1.2 × 10-7 and a shape typical of classical glitches; i.e., it corresponded to a sudden, jump-like increase in the rotational velocity of the star within a day. The detection of this large, typical glitch together with the series of unusual, slow glitches discovered earlier in 1995-2004 indicates the existence of two classes of glitches in the rotational frequency of this pulsar. The presence of various classes of glitches in a single pulsar provides new possibilities for studying the mechanisms giving rise to glitches, which are a source of information about the internal structure of the neutron star. A possible interpretation of these results is discussed.

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