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Title: Long-term X-ray variability of the microquasar system LS5039/RX J1826.2-1450
Author: Reig, P.
Ribó Gomis, Marc
Paredes i Poy, Josep Maria
Martí Ribas, Josep
Keywords: Estels
Estels binaris de raigs X
X-ray binaries
Radio astronomy
Issue Date: 2003
Publisher: Springer Verlag
Abstract: We report on the results of the spectral and timing analysis of a BeppoSAX observation of the microquasar system LS 5039/RX J1826.2-1450. The source was found in a low-flux state with Fx(1-10 keV)= 4.7 x 10^{-12} erg cm^{-2} s^{-1}, which represents almost one order of magnitude lower than a previous RXTE observation 2.5 years before. The 0.1--10 keV spectrum is described by an absorbed power-law continuum with photon-number spectral index Gamma=1.8+-0.2 and hydrogen column density of NH=1.0^{+0.4}_{-0.3} x 10^{22} cm^{-2}. According to the orbital parameters of the system the BeppoSAX observation covers the time of an X-ray eclipse should one occur. However, the 1.6-10 keV light curve does not show evidence for such an event, which allows us to give an upper limit to the inclination of the system. The low X-ray flux detected during this observation is interpreted as a decrease in the mass accretion rate onto the compact object due to a decrease in the mass-loss rate from the primary.
Note: Versió postprint del document publicat a:
It is part of: Astronomy and Astrophysics, 2003, vol. 405, num. 1, p. 285-290
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ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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