Journal Article

The black hole candidate MAXI J1659−152: spectral and timing analysis during its 2010 outburst

T. Muñoz-Darias, S. Motta, H. Stiele and T. M. Belloni

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 1, pages 292-300
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI:
The black hole candidate MAXI J1659−152: spectral and timing analysis during its 2010 outburst

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We present a comprehensive spectral-timing study of the black hole candidate MAXI J1659−152 during its 2010 outburst. We analysed 65 Rossi X-ray timing explorer (RXTE) observations taken along this period, and computed the fundamental diagrams commonly used to study black hole transients. We fitted power density and energy spectra and studied the evolution of the spectral and timing parameters along the outburst. We discuss the evolution of the variability observed at different energy bands on the basis of the relative contribution of the disc and hard components to the energy spectrum of the source. We conclude that hard emission accounts for the observed fast variability, it being strongly quenched when type-B oscillations are observed. We find that both disc and hard emission are responsible for local count rate peaks until the system reaches the soft state. From that point, the peaks are only observed in the hard component, whereas the thermal component drops monotonically probably following the accretion rate decrease. We have also computed time-lags between soft and hard X-ray variability confirming that lags are larger during the hard-to-soft transition than during the hard state.

Keywords: accretion, accretion discs; binaries: close; stars: individual: MAXI J1659−152; X-rays: stars

Journal Article.  7238 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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