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Journal Article

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


Bosch-Ramon,  Valenti
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Paredes, J. M., Ribo, M., Bosch-Ramon, V., West, J. R., Butt, Y. M., Torres, D. F., et al. (2007). Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure? Astrophysical Journal, Part 2 Letters, 664(1), L39-L42.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7CA4-B
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/cm2/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.