Chandra X-ray observations of the two brightest unidentified high galactic latitude Fermi-LAT γ-ray sources

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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. © © 2012. The American Astronomical Society. All rights reserved..

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Cheung, C. C., Donato, D., Gehrels, N., Sokolovsky, K. V., & Giroletti, M. (2012). Chandra X-ray observations of the two brightest unidentified high galactic latitude Fermi-LAT γ-ray sources. Astrophysical Journal, 756(1). https://doi.org/10.1088/0004-637X/756/1/33

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