HARD X-RAY FLUX UPPER LIMITS OF CENTRAL COMPACT OBJECTS IN SUPERNOVA REMNANTS

Erdeve I., Kalemci E., Alpar M. A.

ASTROPHYSICAL JOURNAL, vol.696, no.2, pp.1792-1797, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 696 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1088/0004-637x/696/2/1792
  • Journal Name: ASTROPHYSICAL JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1792-1797
  • Istanbul University Affiliated: Yes

Abstract

We searched for hard X-ray (20-300 keV) emission from nine central compact objects (CCOs) 1E 1207.4-5209, 1WGA J1713-3949, J082157.5-430017, J085201.4-461753, J160103.1-513353, J1613483-5055, J181852.0-150213, J185238.6+004020, and J232327.9+584843 with the International Gamma-Ray Astrophysics Laboratory observatory. We applied spectral imaging analysis and did not detect any of the sources with luminosity upper limits in the range of 10(33)-10(34) erg s(-1) in the 20-75 keV band. For nearby CCOs (less than 4 kpc), the upper-limit luminosities are an order of magnitude lower than the measured persistent hard X-ray luminosities of anomalous X-ray pulsars. This may indicate that the CCOs are low magnetic field systems with fallback disks around them.