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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
; | | Date: |
2 Mar 2001 | | Journal: | ApJ, 555, 477 | | Subject: | astro-ph | | Abstract: | The X-ray nova XTE J1118+480 suffers minimal extinction (b = 62 degrees) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. (2000) 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 approximately 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 approximately 24 eV thermal component which is due to an accretion disk with a large inner disk radius: > 35 Schwarzschild radii. The second is a quasi power-law component that was recorded with complete spectral coverage from 0.4-160 keV. A model for this two-component spectrum is presented in a companion paper by Esin et al. (2001). | | Source: | arXiv, astro-ph/0103051 | | Services: | Forum | Review | PDF | Favorites | |
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