Photoionized Features in the X-ray Spectrum of EX Hydrae

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We present the first results from a long (496 ks) Chandra High Energy Transmission Grating observation of the intermediate polar EX Hydrae. 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 {approx} 1600 km s{sup -1} and {approx} 150 km s{sup -1}, respectively. We also find that the flux of the broad component is modulated at the white ... continued below

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Luna, G M; Raymond, J C; Brickhouse, N S; Mauche, C W; Proga, D; Steeghs, D et al. September 28, 2009.

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We present the first results from a long (496 ks) Chandra High Energy Transmission Grating observation of the intermediate polar EX Hydrae. 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 {approx} 1600 km s{sup -1} and {approx} 150 km s{sup -1}, respectively. We also find that the flux of the broad component is modulated at the white dwarf spin period, constraining the region where the gas is formed. We propose a scenario where the broad component is formed in the pre-shock 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 like O VIII, Mg XII, and Si XIV, our photoionization model constrains the height of the standing shock above the white dwarf surface.

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PDF-file: 21 pages; size: 0.2 Mbytes

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  • Journal Name: Astrophysical Journal, vol. 711, no. 2, March 10, 2010, pp. 1333-1337; Journal Volume: 711; Journal Issue: 2

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  • Report No.: LLNL-JRNL-417591
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 973868
  • Archival Resource Key: ark:/67531/metadc930850

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  • September 28, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 30, 2016, 4:43 p.m.

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Luna, G M; Raymond, J C; Brickhouse, N S; Mauche, C W; Proga, D; Steeghs, D et al. Photoionized Features in the X-ray Spectrum of EX Hydrae, article, September 28, 2009; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc930850/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.