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

McClintock, J.E.; Haswell, C.A.; Garcia, M.R.; Drake, J.J.; Hynes, R.I.; Marshall, H.L.; Muno, M.P.; Chaty, S.; Garnavich, P.M.; Groot, P.J.; Lewin, W.H.G.; Mauche, C.W.; Miller, J.M.; Pooley, G.G.; Shrader, C.R. and Vrtilek, S.D. (2001). Complete and simultaneous spectral observations of the black hole X-Ray nova XTE J1118+480. Astrophysical Journal, 555(number 1,) pp. 477–482.




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 0.247 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: 35R Schw. 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.

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