The Spectral Evolution of GRS 1915+105 During the Dips

Details The Spectral Evolution of GRS 1915+105 During the Dips The Spectral Evolution of GRS 1915+105 During the Dips

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.3509s&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #35.09; Bulletin of the American Astronomical Society, Vol. 28, p.1315

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Between April and October 1996, as has been reported, several RXTE observations of GRS 1915+105 revealed the existence of large dips in the light curve in which the intensity was reduced by up to a factor of ten from the mean. These dips have varying duration (of several hundred seconds) and repetition time-scales (up to a few thousand seconds). From detailed energy spectra, it is found that the spectral evolution during the dips is dramatic but nevertheless similar for all these observations. In comparison with the mean spectrum, the spectrum during the dip is much harder. A spectral transition occurs at the phase corresponding to a sudden increase in source intensity. In particular, the spectrum jumps discontinuously from the hard dip spectrum to a one which is softer than the mean. It is suggested that the dips are a result of a rapid evacuation of the cold inner accretion disk. The evacuated mass may fall into the black hole or be ejected in the vertical direction. In both cases the gravitational potential energy is converted into kinetic energy without significant radiative losses.

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