Relativistic iron emission and disk reflection in galactic microquasar XTE J1748-288

J. M. Miller, D. W. Fox, T. Di Matteo, R. Wijnands, T. Belloni, D. Pooley, C. Kouveliotou, W. H.G. Lewin

Research output: Contribution to journalArticle

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Abstract

We report evidence for an Fe Kα fluorescence line feature and disk reflection in the very high, high, and low-state X-ray spectra of the Galactic microquasar XTE J1748-288 during its 1998 June outburst. Spectral analyses are made on data gathered throughout the outburst by the Rossi X-Ray Timing Explorer Proportional Counter Array. Gaussian line, relativistic disk emission line, and ionized disk reflection models are fitted to the data. In the very high state the line profile appears strongly redshifted, consistent with disk emission from the innermost stable orbits around a maximally rotating Kerr black hole. In the high state the line profile is less redshifted and increasingly prominent. The low-state line profile is very strong (∼ 0.5 keV equivalent width) and centered at 6.7 ± 0.10 keV; disk line emission model fits indicate that the inner edge of the disk fluctuates between ∼ 20Rg and ∼ 100Rg in this state. The disk reflection fraction is traced through the outburst; reflection from an ionized disk is preferred in the very high and high states, and reflection from a relatively neutral disk is preferred in the low state. We discuss the implications of our findings for the binary system dynamics and accretion flow geometry in XTE J1748-288.

Original languageEnglish (US)
Pages (from-to)1055-1067
Number of pages13
JournalAstrophysical Journal
Volume546
Issue number2 PART 1
DOIs
StatePublished - Jan 10 2001

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outburst
iron
fluorescence
accretion
geometry
profiles
flow geometry
X Ray Timing Explorer
proportional counters
orbits

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Miller, J. M., Fox, D. W., Di Matteo, T., Wijnands, R., Belloni, T., Pooley, D., ... Lewin, W. H. G. (2001). Relativistic iron emission and disk reflection in galactic microquasar XTE J1748-288. Astrophysical Journal, 546(2 PART 1), 1055-1067. https://doi.org/10.1086/318291
Miller, J. M. ; Fox, D. W. ; Di Matteo, T. ; Wijnands, R. ; Belloni, T. ; Pooley, D. ; Kouveliotou, C. ; Lewin, W. H.G. / Relativistic iron emission and disk reflection in galactic microquasar XTE J1748-288. In: Astrophysical Journal. 2001 ; Vol. 546, No. 2 PART 1. pp. 1055-1067.
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Miller, JM, Fox, DW, Di Matteo, T, Wijnands, R, Belloni, T, Pooley, D, Kouveliotou, C & Lewin, WHG 2001, 'Relativistic iron emission and disk reflection in galactic microquasar XTE J1748-288', Astrophysical Journal, vol. 546, no. 2 PART 1, pp. 1055-1067. https://doi.org/10.1086/318291

Relativistic iron emission and disk reflection in galactic microquasar XTE J1748-288. / Miller, J. M.; Fox, D. W.; Di Matteo, T.; Wijnands, R.; Belloni, T.; Pooley, D.; Kouveliotou, C.; Lewin, W. H.G.

In: Astrophysical Journal, Vol. 546, No. 2 PART 1, 10.01.2001, p. 1055-1067.

Research output: Contribution to journalArticle

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AB - We report evidence for an Fe Kα fluorescence line feature and disk reflection in the very high, high, and low-state X-ray spectra of the Galactic microquasar XTE J1748-288 during its 1998 June outburst. Spectral analyses are made on data gathered throughout the outburst by the Rossi X-Ray Timing Explorer Proportional Counter Array. Gaussian line, relativistic disk emission line, and ionized disk reflection models are fitted to the data. In the very high state the line profile appears strongly redshifted, consistent with disk emission from the innermost stable orbits around a maximally rotating Kerr black hole. In the high state the line profile is less redshifted and increasingly prominent. The low-state line profile is very strong (∼ 0.5 keV equivalent width) and centered at 6.7 ± 0.10 keV; disk line emission model fits indicate that the inner edge of the disk fluctuates between ∼ 20Rg and ∼ 100Rg in this state. The disk reflection fraction is traced through the outburst; reflection from an ionized disk is preferred in the very high and high states, and reflection from a relatively neutral disk is preferred in the low state. We discuss the implications of our findings for the binary system dynamics and accretion flow geometry in XTE J1748-288.

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Miller JM, Fox DW, Di Matteo T, Wijnands R, Belloni T, Pooley D et al. Relativistic iron emission and disk reflection in galactic microquasar XTE J1748-288. Astrophysical Journal. 2001 Jan 10;546(2 PART 1):1055-1067. https://doi.org/10.1086/318291