Argon X-ray absorption in the local ISM
Abstract
We present the first comprehensive analysis of the argon K-edge absorption region (3.1-4.2 ) using high-resolution HETGS Chandra spectra of 33 low-mas X-ray binaries. Utilizing R-matrix theory, we computed new K photoabsorption cross-sections for Ar~ i-- Ar~ xvi species. For each X-ray source, we estimated column densities for the Ar~ i, Ar~ ii, Ar~ iii, Ar~ xvi, Ar~ xvii and Ar~ xviii ions, which trace the neutral, warm and hot components of the gaseous Galactic interstellar medium. We examined their distribution as a function of Galactic latitude, longitude, and distances to the sources. However, no significant correlations were discerned among distances, Galactic latitude, or longitude. Future X-ray observatories will allow us to benchmark the atomic data as the main resonance lines will be resolved.
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