MODELING THE HARD STATES OF THREE BLACK HOLE CANDIDATES
- Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030 (China)
- AIM-Astrophysique Interactions Multi-echelles (UMR 7158 CEA/CNRS/Universite Paris 7 Denis Diderot), CEA Saclay, DSM/IRFU/Service d'Astrophysique, Bat. 709, L'Orme des Merisiers, FR-91 191 Gif-sur-Yvette Cedex (France)
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 for 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, with 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 quasi-periodic oscillation, 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.
- OSTI ID:
- 21455205
- Journal Information:
- Astrophysical Journal, Vol. 717, Issue 2; Other Information: DOI: 10.1088/0004-637X/717/2/929; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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