Hubble Space Telescope Observations of the Black Hole X-ray Transient GRO J0422+32 Near Quiescence

Details Hubble Space Telescope Observations of the Black Hole X-ray Transient GRO J0422+32 Near Quiescence Hubble Space Telescope Observations of the Black Hole X-ray Transient GRO J0422+32 Near Quiescence

1998-09-10

arxiv.org/abs/astro-ph/9809141v1

MNRAS, 303, 101

Astronomy and Astrophysics

Astrophysics

7 pages with 7 postscript figures included, uses mn.sty. Accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.1999.02227.x

We present HST/FOS ultraviolet and optical spectroscopy of the black hole X-ray transient GRO J0422+32 shortly before the system reached quiescence. We find that the accretion spectrum from 2500-9000A can be very well fit by a self-absorbed synchrotron model, with superposed HI and MgII emission lines. The explanations we suggest for this spectrum are that it is either due to active coronal regions above a geometrically thin accretion disc, or that the disc is evaporated into an advective flow.

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