GAMMA-RAY OBSERVATIONS OF THE MICROQUASARS CYGNUS X-1, CYGNUS X-3, GRS 1915+105, AND GX 339-4 WITH THE FERMI LARGE AREA TELESCOPE
Bodaghee A, Tomsick JA, Pottschmidt K, Rodriguez J, Wilms J, Pooley GG (2013)
Publication Status: Published
Publication Type: Journal article
Publication year: 2013
Journal
Publisher: IOP PUBLISHING LTD
Book Volume: 775
Article Number: ARTN 98
Journal Issue: 2
DOI: 10.1088/0004-637X/775/2/98
Abstract
Detecting gamma-rays from microquasars is a challenging but worthwhile endeavor for understanding particle acceleration and the jet mechanism and for constraining leptonic/hadronic emission models. We present results from a likelihood analysis on timescales of 1 day and 10 days of similar to 4 yr worth of gamma-ray observations (0.1-10 GeV) by Fermi-LAT of Cyg X-1, Cyg X-3, GRS 1915 + 105, and GX 339-4. Our analysis reproduced all but one of the previous gamma-ray outbursts of Cyg X-3 as reported with Fermi or AGILE, plus five new days on which Cyg X-3 is detected at a significance of similar to 5 sigma that are not reported in the literature. In addition, Cyg X-3 is significantly detected on 10 day timescales outside of known gamma-ray flaring epochs, which suggests that persistent gamma-ray emission from Cyg X-3 has been detected for the first time. For Cyg X-1 we find three low-significance excesses (similar to 3-4 sigma) on daily timescales that are contemporaneous with gamma-ray flares reported (also at low significance) by AGILE. Two other microquasars, GRS 1915+105 and GX 339-4, are not detected, and we derive 3 sigma upper limits of 2.3 x 10(-8) photons cm(-2) s(-1) and 1.6 x 10-8 photons cm(-2) s(-1), respectively, on the persistent flux in the 0.1-10 GeV range. These results enable us to define a list of the general conditions that are necessary for the detection of gamma-rays from microquasars.
Authors with CRIS profile
Involved external institutions
University of Cambridge
United Kingdom (GB)
University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot
France (FR)
University of Maryland
United States (USA) (US)
University of California, Berkeley
United States (USA) (US)
United Kingdom (GB)
University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot
France (FR)
University of Maryland
United States (USA) (US)
University of California, Berkeley
United States (USA) (US)
How to cite
APA:
Bodaghee, A., Tomsick, J.A., Pottschmidt, K., Rodriguez, J., Wilms, J., & Pooley, G.G. (2013). GAMMA-RAY OBSERVATIONS OF THE MICROQUASARS CYGNUS X-1, CYGNUS X-3, GRS 1915+105, AND GX 339-4 WITH THE FERMI LARGE AREA TELESCOPE. Astrophysical Journal, 775(2). https://doi.org/10.1088/0004-637X/775/2/98
MLA:
Bodaghee, Arash, et al. "GAMMA-RAY OBSERVATIONS OF THE MICROQUASARS CYGNUS X-1, CYGNUS X-3, GRS 1915+105, AND GX 339-4 WITH THE FERMI LARGE AREA TELESCOPE." Astrophysical Journal 775.2 (2013).
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