Search for GeV gamma-ray emission from ultraluminous X-ray sources
Abstract
Ultraluminous X-ray (ULX) sources show X-ray luminosities above 1039 erg/s which correspond to Eddington luminosities of 20 ~ 200 solar-mass objects. They are found in arms of spiral galaxies and a catalog of 127 ULX objects has been issued by Swartz et al. (2011). None but M82 of these sources are known as gamma-ray emitters in the second Fermi-LAT catalog. We have searched for gamma-ray signal for 18 galaxies which include ULX sources with Fermi-LAT data collected during 2.5 years after launch. In this paper we report the result of this search and discuss its implication on ULX activies.
- Publication:
-
High Energy Gamma-Ray Astronomy: 5th International Meeting on High Energy Gamma-Ray Astronomy
- Pub Date:
- December 2012
- DOI:
- 10.1063/1.4772350
- Bibcode:
- 2012AIPC.1505..677U