The XMM-Newton View of GRS1915+105

Details The XMM-Newton View of GRS1915+105 The XMM-Newton View of GRS1915+105

2005-10-21

arxiv.org/abs/astro-ph/0510651v2

Astron.Astrophys.448:677,2006

Astronomy and Astrophysics

Astrophysics

11 pages, 7 figures. Accepted for publication on Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20053446

(abridged) Two XMM-Newton observations of the black-hole binary GRS1915+105 were triggered in 2004, during a long "plateau" state of the source. (...) While the light curves show just small amplitude variations (a few percent) at timescales longer than a few seconds, a QPO is seen at about 0.6 Hz (...). The pn spectrum is well fitted without invoking thermal disk emission, on the base of four main components: a primary one (...), absorbed by cold matter with abundances different than those of standard ISM; reprocessing from an ionized disk; emission and absorption lines; and a soft X-ray excess around 1 keV. However, the latter is not confirmed by the RGS spectra, whose difference from the EPIC-pn ones actually lacks of a fully satisfactory explanation. If real, the soft X-ray excess may be due to reflection from an optically thin, photoionized disk wind; in this case it may yield a way to disentangle intrinsic from interstellar absorption.

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