Скачать или смотреть Long-term X-ray evolution of the black hole candidate IGR J17091-3624 over the last decade

HOY Coloquio+After Paris, !Los esperamos!

Ponente: Margarita Pereyra Talamantes (IA-EN)

Hora y Lugar:
12:00, Sede IA-CU,
Auditorio Paris Pishmish.

Titulo: Long-term X-ray evolution of the black hole candidate IGR J17091-3624 over the last decade

Resumen:
IGR J17091-3624 is a low mass X-ray binary (LMXB) which received wide attention from the community thanks to its similarities with the bright black hole system GRS 1915+105. Both systems exhibit a wide range of highly structured X-ray variability, with time scales from a few seconds to tens of minutes. In this talk I will present the approach we have taken in the study of this peculiar source by analyzing the long term evolution of its X-ray emission over the last decade. Swift/XRT observations covering its two last outburst episodes, from the onset of the 2011--2013 outburst in February 2011 to the end of the last outburst in November 2016, show that the source exhibited 4 re-brightening events at the decay period of the former outburst. This kind of variability has been observed in other LMXBs, such as the black hole candidate XTE J1650-500 and the neutron star SAX J1808.4-3658, which might suggest that IGR J17091-3624 is not that peculiar after all. Using XMM-Newton and Chandra spectra we study the low luminosity period of the source, at the tail end of the 2011-2013 outburst, were changes in flux as high as a factor of 100 are observed but no strong evidence of softening in the spectra. In order to explore the nature of the compact object inside IGR J17091-3624, we also evaluate the existence of a thermal component in the low luminosity X-ray spectra but no conclusive results were found. The implications of our findings in the context of previous findings for IGR J17091-3624 and other LMXBs will be discussed here.



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