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Complete and simultaneous spectral observations of the black hole X-ray nova XTE J1118 + 480

  • J. E. McClintock
  • , C. A. Haswell
  • , M. R. Garcia
  • , J. J. Drake
  • , R. I. Hynes
  • , H. L. Marshall
  • , M. P. Muno
  • , S. Chaty
  • , P. M. Garnavich
  • , P. J. Groot
  • , W. H.G. Lewin
  • , C. W. Mauche
  • , J. M. Miller
  • , G. G. Pooley
  • , C. R. Shrader
  • , S. D. Vrtilek
  • Center for Astrophysics | Harvard & Smithsonian
  • The Open University
  • University of Southampton
  • Massachusetts Institute of Technology
  • University of Notre Dame
  • Lawrence Livermore National Laboratory
  • Mullard Radio Astronomy Observatory
  • NASA Goddard Space Flight Center

Research output: Contribution to journalArticlepeer-review

139 Citations (Scopus)

Abstract

The X-ray nova XTE J1118 + 480 suffers minimal extinction (b = 62°) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. conducted the first such study, which was centered on 2000 April 8 using UKIRT, EUVE, HST, and RXTE. On 2000 April 18, the Chandra X-Ray Observatory obtained data coincident with a second set of observations using all of these same observatories. A 30 ks grating observation using Chandra yielded a spectrum with high resolution and sensitivity covering the range 0.24-7 keV. Our near-simultaneous observations cover ≈ 80% of the electromagnetic spectrum from the infrared to hard X-rays. The UV/X-ray spectrum of XTE J1118 + 480 consists of two principal components. The first of these is an ≈ 24 eV thermal component that is caused by an accretion disk with a large inner disk radius: ≳ 35RSchw. The second is a quasi power-law component that was recorded with complete spectral coverage from 0.4 to 160 keV. A model for this two-component spectrum is presented in a companion paper by Esin et al.

Original languageEnglish
Pages (from-to)477-482
Number of pages6
JournalAstrophysical Journal
Volume555
Issue number1 PART 1
DOIs
Publication statusPublished - 1 Jul 2001
Externally publishedYes

Keywords

  • Accretion, accretion disks
  • Binaries: close
  • Ultraviolet : stars
  • X-rays: stars

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