Discovery of a broad iron line in the black-hole candidate Swift J1753.5-0127, and the disk emission in the low/hard state revisited

Abstract

We analyzed simultaneous archival XMM-Newton and RXTE observations of the X-ray binary and black hole candidate Swift J1753.5-0127. In a previous analysis of the same data a soft thermal component was found in the X-ray spectrum, and the presence of an accretion disk extending close to the innermost stable circular orbit was proposed. This is in contrast with the standard picture in which the accretion disk is truncated at large radii in the low/hard state. We tested a number of spectral models and we found that several of them fit the observed spectra without the need of a soft disk-like component. This result implies that the classical paradigm of a truncated accretion disk in the low/hard state can not be ruled out by these data. We further discovered a broad iron emission line between 6 and 7 keV in these data. From fits to the line profile we found an inner disk radius that ranges between ~6-16 gravitational radii, which can be in fact much larger, up to ~250 gravitational radii, depending on the model used to fit the continuum and the line. We discuss the implications of these results in the context of a fully or partially truncated accretion disk.

10 pages, 3 figures, 1 table, accepted for publication on MNRAS, using mn2e.cls style file

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Cited by in corpus (29)

• Black hole accretion disks in the canonical low-hard state
• Accretion disc variability in the hard state of black hole X-ray binaries
• Truncation of the Inner Accretion Disk around a Black Hole at Low Luminosity
• Inclination dependence of QPO phase lags in black hole X-ray binaries
• The gas-to-extinction ratio and the gas distribution in the Galaxy
• Constraining Jet/Disk Geometry and Radiative Processes in Stellar Black Holes XTE J1118+480 and GX 339-4
• A systematic analysis of the broad Fe Kalpha line in neutron star LMXBs with XMM-Newton
• Following the 2008 outburst decay of the black hole candidate H1743-322 in X-ray and radio
• A strong and broad iron line in the XMM-Newton spectrum of the new X-ray transient and black-hole candidate XTE J1652-453
• A self-consistent approach to the hard and soft states of 4U 1705-44
• Investigating the disc-jet coupling in accreting compact objects using the black hole candidate Swift J1753.5-0127
• A complex state transition from the black hole candidate Swift J1753.5-0127
• An additional soft X-ray component in the dim low/hard state of black hole binaries
• Relations between X-ray timing features and spectral parameters of Galactic black hole X-ray binaries
• Lorentz Factors of compact jets in Black hole X-ray binaries
• On the nature of the "radio quiet" black hole binaries
• The hard to soft spectral transition in LMXBs - affected by recondensation of gas into an inner disk
• A low-luminosity soft state in the short period black hole X-ray binary Swift J1753.5-0127
• Multiwavelength Observations of Swift J1753.5-0127
• Different X-ray spectral evolution for black hole X-ray binaries in dual tracks of radio-X-ray correlation
• Suzaku broadband spectroscopy of Swift J1753.5-0127 in the Low-Hard State
• The Accreting Black Hole Swift J1753.5-0127 from Radio to Hard X-Ray
• Modeling the hard states of three black hole candidates
• Swift XRT Timing Observations of the Black-Hole Binary SWIFTJ1753.5-0127: Disk-Diluted Fluctuations in the Outburst Peak
• The Curious Case of Swift J1753.5-0127: A Black Hole Low-mass X-ray Binary Analogue to Z Cam Type Dwarf Novae
• Constraining distance and inclination angle of V4641 Sgr using $SWIFT$ and $NuSTAR$ observations during low soft spectral state
• The X-ray Spectrum Of The Black Hole Candidate Swift J1753.5-0127
• Suzaku Observations of the Galactic Center Microquasar 1E 1740.7-2942
• Long term variability of Swift J1753.5-0127]{Long term variability of Swift J1753.5-0127: X-ray spectral-temporal correlations during state transitions