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Photoionized features in the X-ray spectrum of Ex Hydrae
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Luna, G. J. M., Raymond, J., Brickhouse, Nancy, Mauche, Christopher W., Proga, D., Steeghs, D. (Danny), 1972- and Hoogerwerf, R.. (2010) Photoionized features in the X-ray spectrum of Ex Hydrae. Astrophysical Journal, Vol.711 (No.2). pp. 1333-1337. ISSN 0004-637X
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Official URL: http://dx.doi.org/10.1088/0004-637X/711/2/1333
Abstract
We present the first results from a long (496 ks) Chandra High Energy Transmission Grating observation of the intermediate polar EX Hydrae ( EX Hya). In addition to the narrow emission lines from the cooling post-shock gas, for the first time we have detected a broad component in some of the X-ray emission lines, namely, O VIII lambda 18.97, Mg XII lambda 8.42, Si XIV lambda 6.18, and Fe XVII lambda 16.78. The broad and narrow components have widths of similar to 1600 km s(-1) and similar to 150 km s(-1), respectively. We propose a scenario where the broad component is formed in the pre-shock accretion flow, photoionized by radiation from the post-shock flow. Because the photoionized region has to be close to the radiation source in order to produce strong photoionized emission lines from ions such as O VIII, Fe XVII, Mg XII, and Si XIV, our photoionization model constrains the height of the standing shock above the white dwarf surface. Thus, the X-ray spectrum from EX Hya manifests features of both magnetic and non-magnetic cataclysmic variables.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Faculty of Science > Physics |
| Library of Congress Subject Headings (LCSH): | Cataclysmic variable stars |
| Journal or Publication Title: | Astrophysical Journal |
| Publisher: | IOP Publishing |
| ISSN: | 0004-637X |
| Date: | 10 March 2010 |
| Volume: | Vol.711 |
| Number: | No.2 |
| Number of Pages: | 5 |
| Page Range: | pp. 1333-1337 |
| Identification Number: | 10.1088/0004-637X/711/2/1333 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | United States. National Aeronautics and Space Administration (NASA), United States. Dept. of Energy |
| Grant number: | GO7-8026X (NASA), NAS8-03060 (NASA), DE-AC52-07NA27344 (DoE) |
| Related URLs: | |
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| URI: | http://wrap.warwick.ac.uk/id/eprint/6354 |
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