A Search for Giant Pulses from Millisecond Pulsars

Details A Search for Giant Pulses from Millisecond Pulsars A Search for Giant Pulses from Millisecond Pulsars

2005-02-09

arxiv.org/abs/astro-ph/0502203v1

Astrophys.J. 625 (2005) 951-956

Astronomy and Astrophysics

Astrophysics

14 pages, 2 figures, accepted for publication in ApJ

Scientific paper

10.1086/429533

We have searched for microsecond-timescale broadband emission from a sample of eighteen millisecond pulsars. Our study places strong limits on such emission from several millisecond pulsars and shows that it is only present in a small subset of millisecond pulsars. Giant pulses of up to 64 times the mean pulse energy were detected from PSR J1823-3021A in the globular cluster NGC 6624. In contrast to the giant pulses of PSR B1937+21, nearly all of the giant pulses from PSR J1823-3021A were distributed within the trailing half of the main-pulse component of the integrated pulse profile. The fact that no giant pulses were observed on the leading side of the main-pulse component suggests that giant pulses are preferentially emitted closer to the last open field line than ordinary emission. The correlation between giant pulse emissivity and spin-down luminosity in millisecond pulsars suggests that the high period derivative of PSR J1823-3021A is intrinsic and is not just an artifact of its acceleration in the gravitational potential of NGC 6624.

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