X-ray softening in the new X-ray transient XTE J1719-291 during its 2008 outburst decay

M Armas Padilla, N Degenaar, A Patruno, D M Russell, M Linares, Thomas Maccarone, J Homan, R Wijnands

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Abstract

The X-ray transient XTE J1719-291 was discovered with Rossi X-ray Timing Explorer/Proportional Counter Array (RXTE/PCA) during its outburst in 2008 March, which lasted at least 46 d. Its 2-10 keV peak luminosity is 7 × 1035 erg s-1 assuming a distance of 8 kpc, which classifies the system as a very faint X-ray transient. The outburst was monitored with Swift, RXTE, Chandra and XMM-Newton. We analysed the X-ray spectral evolution during the outburst. We fitted the overall data with a simple power-law model corrected for absorption and found that the spectrum softened with decreasing luminosity. However, the XMM-Newton spectrum cannot be fitted with a simple one-component model, but it can be fitted with a thermal component (blackbody or disc blackbody) plus a power-law model affected by absorption. Therefore, the softening of the X-ray spectrum with decreasing X-ray luminosity might be due to a change in photon index or alternatively it might be due to a change in the properties of th
Original languageEnglish
Pages (from-to)659
JournalMonthly Notices of the Royal Astronomical Society
StatePublished - Oct 2011

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    Padilla, M. A., Degenaar, N., Patruno, A., Russell, D. M., Linares, M., Maccarone, T., Homan, J., & Wijnands, R. (2011). X-ray softening in the new X-ray transient XTE J1719-291 during its 2008 outburst decay. Monthly Notices of the Royal Astronomical Society, 659.