Transition to the soft state in GX 339-4

Details Transition to the soft state in GX 339-4 Transition to the soft state in GX 339-4

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2577....1b&link_type=abstract

The Astronomer's Telegram, #2577

Astronomy and Astrophysics

Astronomy

5

X-Ray, Binaries, Black Holes, Transients

Scientific paper

The daily RXTE pointed monitoring of the black-hole candidate GX 339-4 showed clear indications of a transition to the soft intermediate state and then to the soft state. On 2010 April 17 14:49UT the source was in the hard intermediate state, displaying a type-C QPO at 5.71+/- 0.03 Hz in the power density spectrum, together with band limited noise. The total 0.1-64 Hz fractional rms was 14%. The source spectrum was already softening considerably since a few days (see ATel # 2573) and its X-ray color (defined as the ratio of PCA counts in the 5.7-9.5 keV band over those in the 2.9-5.7 keV band) was at 0.36.

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