XMM-Newton and Swift observations of XTE J1743-363

摘要

XTEJ1743-363 is a poorly known hard X-ray transient, that displays short andintense flares similar to those observed from Supergiant Fast X-ray Transients.The probable optical counterpart shows spectral properties similar to those ofan M8 III giant, thus suggesting that XTEJ1743-363 belongs to the class of theSymbiotic X-ray Binaries. In this paper we report on the first dedicatedmonitoring campaign of the source in the soft X-ray range with XMM-Newton andSwift/XRT. T hese observations confirmed the association of XTEJ1743-363 withthe previously suggested M8 III giant and the classification of the source as amember of the Symbiotic X-ray binaries. In the soft X-ray domain, XTEJ1743-363displays a high absorption (~6x10^22 cm^-2 ) and variability on time scales ofhundreds to few thousand seconds, typical of wind accreting systems. Arelatively faint flare (peak X-ray flux 3x10^-11 erg/cm^2/s) lasting ~4 ks isrecorded during the XMM-Newton observation and interpreted in terms of the windaccretion scenario.