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An Optical Precursor to the Recent X-ray Outburst of the Black Hole Binary GRO J1655-40 | | Jerome A. Orosz
; Ronald A. Remillard
; Charles D. Bailyn
; Jeffrey E. McClintock
; | | Date: |
15 Dec 1996 | | Subject: | astro-ph | | Affiliation: | The Pennsylvania State University, Massachusetts Institute of Technology, Yale University, Harvard-Smithsonian Center for Astrophysics | | Abstract: | The All Sky Monitor on the Rossi X-ray Timing Explorer detected an X-ray (2-12 keV) outburst from the black hole binary GRO J1655-40 beginning near April 25, 1996. Optical photometry obtained April 20-24, 1996 shows a steady brightening of the source in B, V, R, and I beginning about six days before the start of the X-ray outburst. The onset of the optical brightening was earliest in I and latest in B. However, the rate of the optical brightening was fastest in B and slowest in I. The order of the increases in the different optical filters suggests that the event was an "outside-in" disturbance of the accretion disk. The substantial delay between the optical rise and the rise of the X-rays may provide indirect support for the advection-dominated accretion flow model of the inner regions of the accretion disk. | | Source: | arXiv, astro-ph/9701098 | | Services: | Forum | Review | PDF | Favorites | |
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