M. D. Caballero-García et al. 2009 ApJ 692 1339 doi:10.1088/0004-637X/692/2/1339
M. D. Caballero-García1,8, J. M. Miller2, M. Díaz Trigo3, E. Kuulkers3, A. C. Fabian1, J. M. Mas-Hesse4, D. Steeghs5,6 and M. van der Klis7
Show affiliationsWe present simultaneous XMM-Newton and International Gamma-Ray Astrophysics Laboratory (INTEGRAL) observations of the luminous black hole transient and relativistic jet source GX 339-4. GX 339-4 started an outburst on 2006 November and our observations were undertaken from 2007 January to March. We triggered five INTEGRAL and three XMM-Newton Target of Opportunity observations within this period. Our data cover different spectral states, namely hard intermediate, soft intermediate, and high/soft. We performed spectral analysis to the data with both phenomenological and more physical models and found that a nonthermal component seems to be required by the data in all the observations. We find a hardening of the spectrum in the third observation coincident with appearance of a broad and skewed Fe Kα line. In all spectral states joint XMM/EPIC-pn, JEM-X, ISGRI, and SPI data were fitted with the hybrid thermal/nonthermal Comptonization EQPAIR model. While this model accounts very well for the high-energy emission observed, it has several drawbacks in the description of the lower-energy channels. Our results imply evolution in the coronal properties, the most important one being the transition from a compact corona in the first observation to the disappearance of coronal material in the second and reappearance in the third. This fact, accompained by the plasma ejection events detected in radio on February 4-18, suggest that the ejected medium is the coronal material responsible for the hard X-ray emission.
accretion, accretion disks; black hole physics; gamma rays: observations; radiation mechanisms: non-thermal; radiation mechanisms: thermal; binaries: close
Issue 2 (2009 February 20)
Received 2008 January 2, accepted for publication 2008 October 29
Published 2009 February 24
M. D. Caballero-García et al. 2009 ApJ 692 1339
Saburo Takahashi and Sadamichi Maekawa 2008 Sci. Technol. Adv. Mater. 9 014105
R. D. Blum et al. 2001 The Astronomical Journal 122 1875
T. D. Arber et al. 2009 ApJ 705 1183
Barbara Ancarani(Production Editor) et al 2008 EPL 81 20000
Eric Keto 2003 ApJ 599 1196
M. Siarkowski et al 2009 ApJ 705 L143
F. J. Martínez-Serrano et al 2009 ApJ 705 L133
M A Hakulinen et al 2003 Phys. Med. Biol. 48 1741
P. Tanga et al 2009 ApJ 706 L197