The Library
Integral and XMM-Newton spectroscopy of GX 339-4 during hard/soft intermediate and high/soft states in the 2007 outburst
Tools
Caballero-Garcia, M. D., Miller, J. M., Diaz Trigo, M., Kuulkers, E., Fabian, A. C., Mas-Hesse, J. M., Steeghs, D. and van der Klis, M. (2009) Integral and XMM-Newton spectroscopy of GX 339-4 during hard/soft intermediate and high/soft states in the 2007 outburst. Astrophysical Journal, Vol.692 (No.2). pp. 1339-1353. doi:10.1088/0004-637X/692/2/1339
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1088/0004-637X/692/2/1339
Abstract
We 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 K-alpha 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.
Item Type: | Journal Item | ||||
---|---|---|---|---|---|
Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Astrophysical Journal | ||||
Publisher: | IOP Publishing | ||||
ISSN: | 0004-637X | ||||
Official Date: | 20 February 2009 | ||||
Dates: |
|
||||
Volume: | Vol.692 | ||||
Number: | No.2 | ||||
Number of Pages: | 15 | ||||
Page Range: | pp. 1339-1353 | ||||
DOI: | 10.1088/0004-637X/692/2/1339 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | NASA |
Data sourced from Thomson Reuters' Web of Knowledge
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |