The Black Hole Candidate 4U 1630-47 in the Midst of a Transition to the Hard State

Details The Black Hole Candidate 4U 1630-47 in the Midst of a Transition to the Hard State The Black Hole Candidate 4U 1630-47 in the Midst of a Transition to the Hard State

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..247....1t&link_type=abstract

The Astronomer's Telegram, #247

Astronomy and Astrophysics

Astronomy

1

X-Ray, Request For Observations, Black Holes, Transients

Scientific paper

Monitoring observations by the Rossi X-ray Timing Explorer indicate that the recurrent black hole candidate X-ray transient 4U 1630-47 is undergoing a transition to the Hard state. The energy spectrum, which is well-described by the canonical disk-blackbody plus power-law model (along with interstellar absorption and an iron absorption edge), has been evolving over the past few weeks with the most significant evolution being a gradual drop in the inner disk temperature from about 1 keV to 0.49 +/- 0.03 keV during the most recent observation on UT 2004 March 7.

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