Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4101g&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #41.01; Bulletin of the American Astronomical Society, Vol. 30, p.1308
Astronomy and Astrophysics
Astrophysics
Scientific paper
The paradigm that young (< 10(4-5) yrs) neutron stars (NSs) evolve as rapidly rotating Crab-like pulsars requires re-examination. Recent comprehensive radio surveys suggest that most radio pulsars near SNRs can be attributed to chance overlap (e.g. Lorimer et al. 1998, AA, 331, 1002; Gaensler & Johnston 1995, MNRAS, 277, 1243; see Kaspi et al. 1996, AJ, 111, 2028 for a review). With the results of these new surveys, traditional arguments for the lack of observed radio pulsars associated with SNR, such as those invoking beaming and large ``kick'' velocities, are less compelling. It is now clear that this discrepancy is an important and vexing problem in current astrophysics. Progress in resolving this mystery is suggested by recent X-ray observations of young SNRs. Evidence is accumulating that many young NSs are slowly rotating (P ~ 10-s) X-ray pulsars, lacking in detectable radio emission. There are currently about a dozen slow X-ray pulsars apparently associated with young SNRs. These include the four known soft gamma -ray repeaters (SGR), which have recently been confirmed as slow rotators. In fact, there are now more known slow, radio-quiet X-ray pulsars in the center of identified SNR than confirmed Crab-like radio pulsars! Here, we consider the observational properties of these radio-quiet NS candidates associated with supernova remnants, which suggests that alternative evolutionary-paths exist for young pulsars. We postulate that such objects account for the apparent paucity of radio pulsars in supernova remnants.
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