Modeling the hard states of three black hole candidates

Abstract

Simultaneous multiwavelength observations were recently performed for three black hole candidates --- SWIFT J1753.5-0127, GRO J1655-40 and XTE J1720-318. In this paper we test the accretion-jet model originally proposed to XTE J1118+480 by investigating the hard state of these three sources using this model. The accretion flow in the model is composed of an inner hot accretion flow and an outer truncated thin disk. We find that the model satisfactorily explains the spectrum ranging from radio to X-rays, with the radio and X-ray spectra dominated by the synchrotron and thermal Comptonization emissions in the jet and the hot accretion flow respectively, while the infrared and optical being the sum of the emissions from the jet, hot accretion flow, and the truncated thin disk. Similar to the case of XTE J1118+480, the model can also explain, although only qualitatively in some cases, the observed timing features including QPO, and positive and negative time lags between the optical and X-ray emissions detected in SWIFT J1753.5-0127. The origin of the ejection events detected in XTE J1720-318 is also briefly discussed.

7 pages, 6 figures accepted for publication in ApJ, minor modification after proof

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• The Emission from Inner Disk and Corona in the Low and Intermediate Spectral States of Black Hole X-ray Binaries
• Multiwavelength Observations of Swift J1753.5-0127
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• The disk evaporation model for the spectral features of low-luminosity active galactic nuclei
• The Accreting Black Hole Swift J1753.5-0127 from Radio to Hard X-Ray
• Relationship Between the Kinetic Power and Bolometric Luminosity of Jets: limitation from black hole X-ray binaries, active galactic nuclei, and gamma-ray bursts
• Optical and Near-Infrared Spectroscopy of the Black Hole Swift J1753.5-0127
• Do Intermediate-Mass Black Holes Exist in Globular Clusters?
• A model for the radio/X-ray correlation in three neutron star low-mass X-ray binaries 4U 1728-34, Aql X-1 and EXO 1745-248
• The influence of outflows on the 1/f-like luminosity fluctuations
• Modeling the Spectrum of IGR J17177-3656
• A disk-corona model for low/hard state of black hole X-ray binaries