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arXiv:0706.0877 (astro-ph)
[Submitted on 6 Jun 2007]

Title:Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure?

Authors:J.M. Paredes, M. Ribo, V. Bosch-Ramon, J.R. West, Y.M. Butt, D.F. Torres, J. Marti
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Abstract: We present a 50 ks observation of the gamma-ray binary LSI+61303 carried out with the ACIS-I array aboard the Chandra X-ray Observatory. This is the highest resolution X-ray observation of the source conducted so far. Possible evidence of an extended structure at a distance between 5 and 12 arcsec towards the North of LSI+61303 have been found at a significance level of 3.2 sigma. The asymmetry of the extended emission excludes an interpretation in the context of a dust-scattered halo, suggesting an intrinsic nature. On the other hand, while the obtained source flux, of F_{0.3-10 keV}=7.1^{+1.8}_{-1.4} x 10^{-12} ergs/cm^2/s, and hydrogen column density, N_{H}=0.70+/-0.06 x 10^{22} cm^{-2}, are compatible with previous results, the photon index Gamma=1.25+/-0.09 is the hardest ever found. In light of these new results, we briefly discuss the physics behind the X-ray emission, the location of the emitter, and the possible origin of the extended emission ~0.1 pc away from LSI+61303.
Comments: 4 pages, 3 figures. Accepted for publication in ApJ Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.0877 [astro-ph]
  (or arXiv:0706.0877v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.0877
Journal reference: Astrophys.J.664:L39-L42,2007
Related DOI: https://doi.org/10.1086/520674

Submission history

From: Marc Ribo [view email]
[v1] Wed, 6 Jun 2007 17:57:24 UTC (109 KB)
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