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Title: Chandra observations of the gamma-ray binary LSI+61303: extended X-ray Structure?
Author: Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Bosch i Ramon, Valentí
West, Jennifer R.
Butt, Yousaf M.
Torres, Diego F.
Martí, Josep
Keywords: Raigs X
Raigs gamma
Observacions astronòmiques
Gamma rays
Astronomical observations
Issue Date: 11-Jul-2007
Publisher: Institute of Physics (IOP)
Abstract: We present a 50 ks observation of the gamma-ray binary LS I +61 303 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' toward the north of LS I +61 303 has been found at a significance level of 3.2 σ. 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 F0.3-10keV=7.1+1.8-1.4×10-12 ergs cm-2 s-1 and hydrogen column density NH=(0.70+/-0.06)×1022 cm-2 are compatible with previous results, the photon index Γ=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 LS I +61 303.
Note: Reproducció del document publicat a:
It is part of: Astrophysical Journal, 2007, vol. 664, num. 1, p. L39-L42
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ISSN: 0004-637X
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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