Journal Article

The 2009 outburst from the new X-ray transient and black-hole candidate XTE J1652–453

Peng Han, Jinlu Qu, Shu Zhang, Jianmin Wang, Liming Song, Guoqiang Ding, Shuping Yan and Yu Lu

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 2, pages 1072-1078
Published in print May 2011 | ISSN: 0035-8711
Published online April 2011 | e-ISSN: 1365-2966 | DOI:
The 2009 outburst from the new X-ray transient and black-hole candidate XTE J1652–453

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We analyse the Rossi X-ray Timing Explorer (RXTE) and Swift observations of the 2009 outburst from a newly discovered transient and black hole candidate XTE J1652−453. The behaviour of the source was observed by RXTE to be a sequence of spectral states that are typical of black-hole X-ray binaries. During the first seven observations, it is determined that the source remains in a high/soft state. This is determined from the spectrum that is dominated by a soft thermal component, which contributes an average of ∼85 per cent to the X-ray flux at 2–20 keV, and from the hardness ∼0.1 showing up in the hardness-intensity diagram. For the last 20 observations, the spectral state is classified as low/hard, according to an average hardness of ∼0.8 and a balance between the thermal and the non-thermal components; a power-law component takes ≥80 per cent of the total 2–20 keV flux. Located in between is an intermediate state that the source might have experienced. The usual relationship between the rms and hardness is also present in the hardness–rms diagram. Throughout the outburst, no quasi-periodic oscillations are found in XTE J1652−453.

Keywords: accretion, accretion discs; black hole physics; stars: evolution; stars: individual: XTE J1652–453; X-rays: binaries

Journal Article.  4551 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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