Title:
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Long-term X-ray variability of the microquasar system LS5039/RX J1826.2-1450
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Author:
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Reig, P.; Ribó Gomis, Marc; Paredes i Poy, Josep Maria; Martí Ribas, Josep
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Estels -Estels binaris de raigs X -Radioastronomia -Quàsars -Stars -X-ray binaries -Radio astronomy -Quasars |
Rights:
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(c) Springer Verlag, 2003
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Document type:
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Article Article - Accepted version |
Published by:
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Springer Verlag
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