Journal
ASTROPHYSICAL JOURNAL
Volume 692, Issue 1, Pages 502-510Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/692/1/502
Keywords
dust, extinction; globular clusters: individual (Terzan 2); X-rays: ISM
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Funding
- NASA
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We use the X-ray dust halo of the low-mass X-ray binary 4U 1724-307, located in the globular cluster Terzan 2, to probe the interstellar medium along this line of sight (LOS). The X-ray dust halo arises from X-rays scattering off of interstellar dust grains. Using a low optical depth sight line to determine the Chandra ACIS point-spread function, we extracted the radial profile as a function of energy and used it to determine the H column density (N-H) and cloud location along the LOS for several dust grain models, including the commonly-used models of MRN and WD. The resulting N-H values were used to determine the reddening E(B-V), which was then compared with the average E(B-V) for this sight line found by other workers. We found that for this LOS, only the ZDA BARE-AC-S, BARE-GR-FG, and BARE-GR-S models yield reddenings within 1 sigma of the literature average.
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