Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-06-17
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Accepted for publication in the Astrophysical Journal; 10 pages; 10 figures; 3 tables; emulateapj style
Scientific paper
We present a detailed study of the X-ray dust scattering halo of the black hole candidate \cygx1 based on two \chandra\ HETGS observations. Using 18 different dust models, including one modified by us (dubbed XLNW), we probe the interstellar medium between us and this source. A consistent description of the cloud properties along the line of sight that describes at the same time the halo radial profile, the halo lightcurves, and the column density from source spectroscopy is best achieved with a small subset of these models. Combining the studies of the halo radial profile and the halo lightcurves, we favor a geometric distance to \cygx1 of $d=1.81\pm{0.09}$\,kpc. Our study also shows that there is a dense cloud, which contributes $\sim$50% of the dust grains along the line of sight to \cygx1, located at $\sim1.6$ kpc from us. The remainder of the dust along the line of sight is close to the black hole binary.
Lee Julia C.
Nowak Michael A.
Wilms Jörn
Xiang Jingen
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