English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

IGR J17091-3624 is a low mass X-ray binary (LMXB) which received wideattention from the community thanks to its similarities with the bright blackhole system GRS 1915+105. Both systems exhibit a wide range of highlystructured X-ray variability during outburst, with time scales from few secondsto tens of minutes, which make them unique in the study of mass accretion inLMXBs. In this work we present a general overview into the long-term evolutionof IGR J17091-3624, using Swift/XRT observations from the onset of the2011-2013 outburst in February 2011 to the end of the last bright outburst inNovember 2016. We found 4 re-flares during the decay of the 2011 outburst, butno similar re-flares appear to be present in the latter one. We studied indetail the period with the lowest flux observed in the last 10 years, just atthe tail end of the 2011-2013 outburst, using Chandra and XMM-Newtonobservations. We observed changes in flux as high as a factor of 10 during thisperiod of relative quiescence, without strong evidence of softening in thespectra. This result suggests that the source has not been observed at its truequiescence so far. By comparing the spectral properties at low luminosities ofIGR J17091-3624 and those observed for a well studied population of LMXBs, weconcluded that IGR J17091-3624 is most likely to host a black hole as a compactcompanion rather than a neutron star.

Swift/XRT, Chandra and XMM-Newton observations of IGR J17091-3624 as it returns into quiescence