The Rich Mid-Infrared Environments of Two Highly-Obscured X-ray Binaries: Spitzer Observations of IGR J16318-4848 and GX 301-2 - AstrophysicsReport as inadecuate




The Rich Mid-Infrared Environments of Two Highly-Obscured X-ray Binaries: Spitzer Observations of IGR J16318-4848 and GX 301-2 - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present the results of Spitzer mid-infrared spectroscopic observations oftwo highly-obscured massive X-ray binaries: IGR J16318-4848 and GX301-2. Ourobservations reveal for the first time the extremely rich mid-infraredenvironments of this type of source, including multiple continuum emissioncomponents a hot component with T > 700 K and a warm component with T ~ 180 Kwith apparent silicate absorption features, numerous HI recombination lines,many forbidden ionic lines of low ionization potentials, and pure rotational H2lines. This indicates that both sources have hot and warm circumstellar dust,ionized stellar winds, extended low-density ionized regions, andphoto-dissociated regions. It appears difficult to attribute the total opticalextinction of both sources to the hot and warm dust components, which suggeststhat there could be an otherwise observable colder dust component responsiblefor the most of the optical extinction and silicate absorption features. Theobserved mid-infrared spectra are similar to those from Luminous BlueVariables, indicating that the highly-obscured massive X-ray binaries mayrepresent a previously unknown evolutionary phase of X-ray binaries withearly-type optical companions. Our results highlight the importance and utilityof mid-infrared spectroscopy to investigate highly-obscured X-ray binaries.



Author: Dae-Sik Moon, David Kaplan, William Reach, Fiona Harrison, Jeong-Eun Lee, Peter Martin

Source: https://arxiv.org/



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