2005ApJ...620..905Y -
Astrophys. J., 620, 905-914 (2005/February-3)
An accretion-jet model for black hole binaries: interpreting the spectral and timing features of XTE J1118+480.
YUAN F., CUI W. and NARAYAN R.
Abstract (from CDS):
Multiwavelength observations of the black hole X-ray binary XTE J1118+480 have offered abundant spectral and timing information about the source and have thus provided serious challenges to theoretical models. We propose a coupled accretion-jet model to interpret the observations. We model the accretion flow as an outer standard thin accretion disk truncated at a transition radius by an inner hot accretion flow. The accretion flow accounts for the observed UV and X-ray emission, but it substantially underpredicts the radio and infrared fluxes, even after we allow for nonthermal electrons in the hot flow. We attribute the latter components to a jet. We model the jet emission by means of the internal shock scenario, which is widely employed for gamma-ray bursts. In our accretion-jet model of XTE J1118+480, the jet dominates the radio and infrared emission, the thin disk dominates the UV emission, and the hot flow produces most of the X-ray emission. The optical emission has contributions from all three components: jet, thin disk, and hot flow. The model qualitatively accounts for timing features, such as the intriguing positive and negative time lags between the optical and X-ray emission and the wavelength-dependent variability amplitude.
Abstract Copyright:
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Journal keyword(s):
Accretion, Accretion Disks - Black Hole Physics - ISM: Jets and Outflows - Stars: Individual: Alphanumeric: XTE J1118+480 - X-Rays: Stars
Simbad objects:
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