State transition of GX 339-4

Details State transition of GX 339-4 State transition of GX 339-4

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005atel..455....1s&link_type=abstract

The Astronomer's Telegram, #455

Astronomy and Astrophysics

Astronomy

3

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

Scientific paper

Twice-weekly monitoring with the Proportional Counter Array (PCA) of the Rossi X-ray Timing Explorer shows that GX 339-4 is coming out of an extended period spent in the soft state. The most recent observation, made on 6 April 2005 from 18:03:00 to 18:20:00, shows spectral and timing characteristics of an intermediate state. A disk blackbody component of best-fit maximum temperature (0.57 +/- 0.02) keV carries 2/3 of the energy from 2.5 to 25 keV, and a power law of best-fit photon index (2.21 +/- 0.09) carries most of the remainder.

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