2002ApJ...581..562S -
Astrophys. J., 581, 562-569 (2002/December-2)
The X-ray halo of GX 13+1.
SMITH R.K., EDGAR R.J. and SHAFER R.A.
Abstract (from CDS):
We present observations of the X-ray halo around the low-mass X-ray binary GX 13+1 from the Chandra X-ray telescope. The halo is caused by scattering in interstellar dust grains, and we use it to diagnose the line-of-sight position, size distribution, and density of the grains. Using the intrinsic energy resolution of Chandra's ACIS CCDs and the recent calibration observation of the Chandra point-spread function, we were able to extract the halo fraction as a function of energy and off-axis angle. We define a new quantity, the ``halo coefficient'', or the total halo intensity relative to the source extrapolated to 1 keV, and measure it to be 1.5+0.5–0.1 for GX 13+1. We find a relationship between this value and the dust size, density, and hydrogen column density along the line of sight to GX 13+1. We also conclude that our data do not agree with ``fluffy'' dust models that earlier X-ray halo observations have supported and that models including an additional large dust grain population are not supported by these data.
Abstract Copyright:
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Journal keyword(s):
ISM: Dust, Extinction - Scattering - X-Rays: Binaries - X-Rays: ISM
Nomenclature:
Table 1: [SES2002] A (Nos B-G).
Simbad objects:
9
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