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Title: On the origin of highly ionized X-ray absorbers detected in the galactic X-ray binaries

Abstract

X-ray observations of the Galactic X-ray binaries (XRBs) revealed numerous highly ionized metal absorption lines. However, it is unclear whether such lines are produced by the hot interstellar medium (ISM) or the circumstellar medium intrinsic to the binaries. Here we present a Chandra X-ray absorption line study of 28 observations of 12 XRBs, with a focus on the Ne IX and Fe XVII lines. We report the first detections of these lines in a significant amount of observations. We do not find a significant dependence of the line equivalent width on the distance of the XRBs, but we do see a weak dependence on the source X-ray luminosity. We also find 2 out of 12 selected targets show strong temporal variation of the Ne IX absorbers. While the line ratio between the two ion species suggests a temperature consistent with the previous predictions of the ISM, comparing with two theoretical models of the ISM shows the observed column densities are significantly higher than predictions. On the other hand, photoionization by the XRBs provides a reasonably good fit to the data. Our findings suggest that a significant fraction of these X-ray absorbers may originate in the hot gas intrinsic to themore » XRBs, and that the ISM makes small, if not negligible, contribution. We briefly discuss the implications to the study of the Milky Way hot gas content.« less

Authors:
;  [1]
  1. Department of Astronomy and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian 361005 (China)
Publication Date:
OSTI Identifier:
22348236
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 780; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; COMPARATIVE EVALUATIONS; DENSITY; DETECTION; DISTANCE; LUMINOSITY; METALS; MILKY WAY; PHOTOIONIZATION; X RADIATION

Citation Formats

Luo, Yang, and Fang, Taotao. On the origin of highly ionized X-ray absorbers detected in the galactic X-ray binaries. United States: N. p., 2014. Web. doi:10.1088/0004-637X/780/2/170.
Luo, Yang, & Fang, Taotao. On the origin of highly ionized X-ray absorbers detected in the galactic X-ray binaries. United States. https://doi.org/10.1088/0004-637X/780/2/170
Luo, Yang, and Fang, Taotao. 2014. "On the origin of highly ionized X-ray absorbers detected in the galactic X-ray binaries". United States. https://doi.org/10.1088/0004-637X/780/2/170.
@article{osti_22348236,
title = {On the origin of highly ionized X-ray absorbers detected in the galactic X-ray binaries},
author = {Luo, Yang and Fang, Taotao},
abstractNote = {X-ray observations of the Galactic X-ray binaries (XRBs) revealed numerous highly ionized metal absorption lines. However, it is unclear whether such lines are produced by the hot interstellar medium (ISM) or the circumstellar medium intrinsic to the binaries. Here we present a Chandra X-ray absorption line study of 28 observations of 12 XRBs, with a focus on the Ne IX and Fe XVII lines. We report the first detections of these lines in a significant amount of observations. We do not find a significant dependence of the line equivalent width on the distance of the XRBs, but we do see a weak dependence on the source X-ray luminosity. We also find 2 out of 12 selected targets show strong temporal variation of the Ne IX absorbers. While the line ratio between the two ion species suggests a temperature consistent with the previous predictions of the ISM, comparing with two theoretical models of the ISM shows the observed column densities are significantly higher than predictions. On the other hand, photoionization by the XRBs provides a reasonably good fit to the data. Our findings suggest that a significant fraction of these X-ray absorbers may originate in the hot gas intrinsic to the XRBs, and that the ISM makes small, if not negligible, contribution. We briefly discuss the implications to the study of the Milky Way hot gas content.},
doi = {10.1088/0004-637X/780/2/170},
url = {https://www.osti.gov/biblio/22348236}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 780,
place = {United States},
year = {Fri Jan 10 00:00:00 EST 2014},
month = {Fri Jan 10 00:00:00 EST 2014}
}