English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present simultaneous XMM-Newton and INTEGRAL observations of the luminousblack hole transient and relativistic jet source GX 339-4. GX 339-4 started anoutburst on November of 2006 and our observations were undertaken from Januaryto March of 2007. We triggered five INTEGRAL and three XMM-Newton target ofOpportunity observations within this period. Our data cover different spectralstates, namely Hard Intermediate, Soft Intermediate and High/Soft. We performedspectral analysis to the data with both phenomenological and more physicalmodels and find that a non-thermal component seems to be required by the datain all the observations. We find a hardening of the spectrum in the thirdobservation 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 fitwith the hybrid thermal/non-thermal Comptonization model (EQPAIR). While thismodel accounts very well for the high/energy emission observed, it has severaldrawbacks in the description of the lower energy channels. Our results implyevolution in the coronal properties, the most important one being thetransition from a compact corona in the first observation to the disappearanceof coronal material in the second and re-appearance in the third. This fact,accompanied by the plasma ejection events detected in radio on February 4 to18, suggest that the ejected medium is the coronal material responsible for thehard X-ray emission.

INTEGRAL and XMM-Newton Spectroscopy of GX 339-4 During Hard/Soft Intermediate and High/Soft States in the 2007 Outburst