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

Abstract

Detecting gamma-rays from microquasars is a challenging but worthwhile endeavor for understanding particle acceleration, the jet mechanism, and for constraining leptonic/hadronic emission models. We present results from a likelihood analysis on timescales of 1 d and 10 d of ~4 years 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 5 new days on which Cyg X-3 is detected at a significance of ~5-sigma that are not reported in the literature. In addition, Cyg X-3 is significantly detected on 10-d 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 (~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 2.3e-8 ph/cm2/s and 1.6e-8 ph/cm2/s, 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.

24 pages, 12 figures, 5 tables, accepted for publication in the Astrophysical Journal

References in corpus (15)

• Precise Gamma-Ray Timing and Radio Observations of 17 Fermi Gamma-Ray Pulsars
• Time-Integrated Searches for Point-like Sources of Neutrinos with the 40-String IceCube Detector
• HESS J0632+057 : A new gamma-ray binary?
• Periodic Emission from the Gamma-ray Binary 1FGL J1018.6-5856
• High-energy gamma-ray emission from Cyg X-1 measured by Fermi and its theoretical implications
• Two Years of INTEGRAL monitoring of GRS 1915+105 Part 2: X-Ray Spectro-Temporal Analysis
• Episodic Transient Gamma-Ray Emission from the Microquasar Cygnus X-1
• Stellar Wind Variations During the X-ray High and Low States of Cygnus X-1
• Effects of the stellar wind on X-ray spectra of Cygnus X-3
• Two years of INTEGRAL monitoring of GRS 1915+105 Part 1: multiwavelength coverage with INTEGRAL, RXTE, and the Ryle radio Telescope
• The magnetic field and the location of the TeV emitter in Cygnus X-1 and LS 5039
• The AGILE monitoring of Cygnus X-3: transient gamma-ray emission and spectral constraints
• A classification of the X-ray and radio states of Cyg X-3 and their long-term correlations
• Correlated radio--X-ray variability of Galactic Black Holes: A radio--X-ray flare in Cygnus X-1
• The 2010 May Flaring Episode of Cygnus X-3 in Radio, X-Rays, and γ-Rays

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