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Evidence for Doppler-Shifted Iron Emission Lines in Black Hole Candidate 4U 1630-47 | | Wei Cui
; Wan Chen
; S. N. Zhang
; | | Date: |
1 Sep 1999 | | Subject: | astro-ph | | Affiliation: | MIT), Wan Chen (UMd/GSFC), and S. N. Zhang (UAH | | Abstract: | We report the first detection of a pair of correlated emission lines in the X-ray spectrum of black hole candidate 4U 1630-47 during its 1996 outburst, based on RXTE observations of the source. At the peak plateau of the outburst, the emission lines are detected, centered mostly at $sim$5.7 keV and $sim$7.7 keV, respectively, while the line energies exhibit random variability $sim$5%. Interestingly, the lines move in a concerted manner to keep their separation roughly constant. The lines also vary greatly in strength, but with the lower-energy line always much stronger than the higher-energy one. The measured equivalent width ranges from $sim$50 eV to $sim$270 eV for the former, and from insignificant detection to $sim$140 eV for the latter; the two are reasonably correlated. The correlation between the lines implies a causal connection --- perhaps they share a common origin. Both lines may arise from a single $K_{alpha}$ line of highly ionized iron that is Doppler-shifted either in a Keplerian accretion disk or in a bi-polar outflow or even both. In both scenarios, a change in the line energy might simply reflect a change in the ionization state of line-emitting matter. We discuss the implication of the results and also raise some questions about such interpretations. | | Source: | arXiv, astro-ph/9909023 | | Services: | Forum | Review | PDF | Favorites | |
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