High-energy observations of the state transition of X-ray novaXTE J1720-318

Details High-energy observations of the state transition of X-ray novaXTE J1720-318 High-energy observations of the state transition of X-ray novaXTE J1720-318

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..331c&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report on INTEGRAL, XMM and RXTE observations of the transient source XTE J1720-318 discovered in January 2003 with RXTE. In the first observations, the source was in a very soft state, similar to those seen in black hole transients. Following INTEGRAL observations revealed that the source, active only few months after the outburst, transited towards a much harder state: the source was detected up to 200 keV with typical power law photon index of 1.9 and a peak luminosity of 7.35*1036 ergs s-1.
We will present the spectral and timing properties of the source during the year 2003, using all the high energy instrument data available to us. We conclude that XTE J1720-318 is a new specimen of the black hole X-ray novae which populate our galactic bulge and we discuss its properties in the frame of the spectral models used for transient black hole binaries.

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