An X-Ray Dip in the X-Ray Transient 4U 1630-47

Abstract

An x-ray dip was observed during a 1996 Rossi X-Ray Timing Explorer observation of the recurrent x-ray transient 4U 1630-47. During the dip, the 2-60 keV x-ray flux drops by a factor of about three, and, at the lowest point of the dip, the x-ray spectrum is considerably softer than at non-dip times. We find that the 4U 1630-47 dip is best explained by absorption of the inner part of an accretion disk, while the outer part of the disk is unaffected. The spectral evolution during the dip is adequately described by the variation of a single parameter, the column density obscuring the inner disk.

13 pages, 4 figures, Accepted for publication in ApJ

References in corpus (2)

• An unstable central disk in the superluminal black-hole X-ray binary GRS 1915+105
• Complex outburst behaviour from the black-hole candidate 4U 1630-47

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• X-Ray Observations of the Black Hole Transient 4U 1630-47 During Two Years of X-Ray Activity
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• RXTE Studies of Long-Term X-ray Spectral Variations in 4U 1820-30
• XMM-Newton observations reveal the disappearance of the wind in 4U 1630-47
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• Reflection Modeling of the Black Hole Binary 4U~1630$-$47: the Disk Density and Returning Radiation
• The Timing Evolution of 4U 1630-47 During its 1998 Outburst
• Radio-loudness in black hole transients: evidence for an inclination effect
• AstroSat and MAXI view of the Black Hole binary 4U 1630-472 during 2016 and 2018 Outbursts
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• X-ray Polarization of the Black Hole X-ray Binary 4U 1630-47 Challenges Standard Thin Accretion Disk Scenario
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• Suzaku Observation of the Black Hole Binary 4U 1630--47 in the Very High State
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