Journal Article

A re-analysis of the iron line in the <i>XMM–Newton</i> data from the low/hard state in GX339−4

Chris Done and Maria Diaz Trigo

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 4, pages 2287-2296
Published in print October 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17092.x
A re-analysis of the iron line in the XMM–Newton data from the low/hard state in GX339−4

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The detection of an extremely broad iron line in XMM–Newton MOS data from the low/hard state of the black hole binary GX339−4 is the only piece of evidence which unambiguously conflicts with the otherwise extremely successful truncated disc interpretation of this state. However, it also conflicts with some aspect of observational data for all other alternative geometries of the low/hard state, including jet models, making it very difficult to understand. We re-analyse these data and show that they are strongly affected by pile-up even with extensive centroid removal as the source is ∼200 times brighter than the recommended maximum count rate. Instead, we extract the simultaneous PN timing-mode data which should not be affected by pile-up. These show a line which is significantly narrower than in the MOS data. Thus these data are easily consistent with a truncated disc, and indeed, strongly support such an interpretation.

Keywords: accretion, accretion discs; black hole physics; relativistic processes; X-rays: binaries

Journal Article.  8508 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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