Chandra X-Ray Observations of the Two Brightest Unidentified High Galactic Latitude Fermi-LAT γ-Ray Sources
Abstract
We present Chandra ACIS-I X-ray observations of 0FGL J1311.9-3419 and 0FGL J1653.4-0200, the two brightest high Galactic latitude (|b| >10°) γ-ray sources from the three-month Fermi Large Area Telescope (LAT) bright source list that are still unidentified. Both were also detected previously by EGRET, and despite dedicated multi-wavelength follow-up, they are still not associated with established classes of γ-ray emitters like pulsars or radio-loud active galactic nuclei. X-ray sources found in the ACIS-I fields of view are cataloged, and their basic properties are determined. These are discussed as candidate counterparts to 0FGL J1311.9-3419 and 0FGL J1653.4-0200, with particular emphasis on the brightest of the 9 and 13 Chandra sources detected within the respective Fermi-LAT 95% confidence regions. Further follow-up studies, including optical photometric and spectroscopic observations, are necessary to identify these X-ray candidate counterparts in order to ultimately reveal the nature of these enigmatic γ-ray objects.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 2012
- DOI:
- 10.1088/0004-637X/756/1/33
- arXiv:
- arXiv:1207.1129
- Bibcode:
- 2012ApJ...756...33C
- Keywords:
-
- galaxies: active;
- gamma rays: general;
- pulsars: general;
- X-rays: general;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- ApJ, accepted. 18 pages, 5 figures