X-RAY OBSERVATIONS OF DISRUPTED RECYCLED PULSARS: NO REFUGE FOR ORPHANED CENTRAL COMPACT OBJECTS

作者：Gotthelf E V^*; Halpern J P; Allen B; Knispel B

来源：Astrophysical Journal, 2013, 773(2): 141.

DOI：10.1088/0004-637X/773/2/141

• pulsars: individual (PSR J0609+2130, PSR J1038+0032, PSR J1320-3512, PSR J1333-4449, PSR J1339-4712, PSR J1355-6206, PSR J1548-4821, PSR J1611-5847, PSR J1753-1914, PSR 1821+0155, PSR B1952+29, PSR J2
• stars: neutron

We present a Chandra X-ray survey of the disrupted recycled pulsars (DRPs), isolated radio pulsars with P > 20 ms and B-s < 3 x 10(10) G. These observations were motivated as a search for the immediate descendants of the approximate to 10 central compact objects (CCOs) in supernova remnants (SNRs), 3 of which have similar timing and magnetic properties as the DRPs, but are bright, thermal X-ray sources consistent with minimal neutron star (NS) cooling curves. Since none of the DPRs were detected in this survey, there is no evidence that they are "orphaned" CCOs, NSs whose SNRs has dissipated. Upper limits on their thermal X-ray luminosities are in the range of log L-x[erg s(-1)] = 31.8-32.8, which implies cooling ages > 10(4)-10(5) yr, roughly 10 times the ages of the approximate to 10 known CCOs in a similar volume of the Galaxy. The order of a hundred CCO descendants that could be detected by this method are thus either intrinsically radio quiet or occupy a different region of (P, B-s) parameter space from the DRPs. This motivates a new X-ray search for orphaned CCOs among radio pulsars with larger B-fields, which could verify the theory that their fields are buried by the fall-back of supernova ejecta, but quickly regrow to join the normal pulsar population.

• 出版日期2013-8-20