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Echoes from an Irradiated Disc in GRO J1655-40 | | R. I. Hynes
; K. O’Brien
; Keith Horne
; W. Chen
; C. A. Haswell
; | | Date: |
2 Jun 1998 | | Journal: | MNRAS, 299, L37 | | Subject: | astro-ph | | Affiliation: | U. Sussex), K. O’Brien, Keith Horne (U. St. Andrews), W. Chen (U. Maryland, NASA/GSFC), C. A. Haswell (U. Sussex, Columbia | | Abstract: | We demonstrate correlated rapid variability between the optical/UV and X-ray emission for the first time in a soft X-ray transient, GRO J1655-40: HST light curves show similar features to those seen by RXTE, but with mean delay of 10-20s. We interpret the correlations as due to reprocessing of X-rays into optical and UV emission, with a delay due to finite light travel time, and thus perform echo mapping of the system. The time-delay distribution has a mean of 14.6s +/- 1.4 and dispersion (i.e. the standard deviation of the distribution) of 10.5s +/- 1.9 at binary phase 0.4. Hence we identify the reprocessing region as the accretion disc rather than the mass donor star. | | Source: | arXiv, astro-ph/9806038 | | Services: | Forum | Review | PDF | Favorites | |
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