SPITZER IRS Spectroscopy of Highly-Obscured X-ray Binaries

Details SPITZER IRS Spectroscopy of Highly-Obscured X-ray Binaries SPITZER IRS Spectroscopy of Highly-Obscured X-ray Binaries

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20913105m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #131.05; Bulletin of the American Astronomical Society,

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We present the results of SPITZER IRS spectroscopy of the three highly-obscured X-ray binaries: IGR J16318-4848, XTE J0421+641, and GX 301-2. The hydrogen column densities towards these sources in X-ray observations have been estimated to be greater than 1023/cm2, sometimes reaching 1024/cm2, which makes them some of the most heavily obscured sources known. Our IRS observations revealed the existence of multiple continuum components from these sources in the mid-infrared, together with numerous emission lines. The strong continuum emission may represent the circumstellar dust which is likely responsible for the heavy obscuration of these sources. One interesting feature is that while IGR J16318-4848 and GX 301-2 are somewhat similar to each other in the mid-infrared, XET J0421+641 appears to be different from them. Our results demonstrate the importance of mid-infrared observations to understand these new growing number of highly-obscured X-ray binaries.

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