Echoes from an Irradiated Disc in GRO J1655-40

Details Echoes from an Irradiated Disc in GRO J1655-40 Echoes from an Irradiated Disc in GRO J1655-40

1998-06-02

arxiv.org/abs/astro-ph/9806038v1

MNRAS, 299, L37

Astronomy and Astrophysics

Astrophysics

5 pages with 11 postscript figures included, uses mn.sty. Accepted for publication as MNRAS letter

Scientific paper

10.1046/j.1365-8711.1998.01856.x

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.

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