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dc.contributor.authorAltamirano, D.
dc.contributor.authorBelloni, T.
dc.contributor.authorLinares, M.
dc.contributor.authorvan der Klis, M.
dc.contributor.authorWijnands, R.
dc.contributor.authorCurran, Peter
dc.contributor.authorKalamkar, M.
dc.contributor.authorStiele, H.
dc.contributor.authorMotta, S.
dc.contributor.authorMunoz-Darias, T.
dc.contributor.authorCasella, P.
dc.contributor.authorKrimm, H.
dc.identifier.citationAltamirano, D. and Belloni, T. and Linares, M. and van der Klis, M. and Wijnands, R. and Curran, P. and Kalamkar, M. et al. 2011. The Faint "Heartbeats" of IGR J17091-3624: An Exceptional Black Hole Candidate. The Astrophysical Journal Letters. 742.

We report on the first 180 days of Rossi X-Ray Timing Explorer observations of the outburst of the black holecandidate IGR J17091–3624. This source exhibits a broad variety of complex light curve patterns including periodsof strong flares alternating with quiet intervals. Similar patterns in the X-ray light curves have been seen in the (upto now) unique black hole system GRS 1915+105. In the context of the variability classes defined by Belloni et al.for GRS 1915+105, we find that IGR J17091–3624 shows the ?, ?, a, ?, ß, and µ classes as well as quiet periodswhich resemble the ? class, all occurring at 2–60 keV count rate levels which can be 10–50 times lower thanobserved in GRS 1915+105. The so-called ? class “heartbeats” occur as fast as every few seconds and as slow as~100 s, tracing a loop in the hardness–intensity diagram which resembles that previously seen in GRS 1915+105.However, while GRS 1915+105 traverses this loop clockwise, IGR J17091–3624 does so in the opposite sense.We briefly discuss our findings in the context of the models proposed for GRS 1915+105 and find that either allmodels requiring near Eddington luminosities for GRS 1915+105-like variability fail, or IGR J17091–3624 lies ata distance well in excess of 20 kpc, or it harbors one of the least massive black holes known (<3M).

dc.publisherInstitute of Physics Publishing Ltd.
dc.subjectstars: individual (IGR J17091–3624
dc.subjectGRS 1915+105)
dc.subjectblack hole physics
dc.subjectX-rays: - binaries
dc.subjectbinaries: close
dc.titleThe Faint "Heartbeats" of IGR J17091-3624: An Exceptional Black Hole Candidate
dc.typeJournal Article
dcterms.source.titleThe Astrophysical Journal Letters
curtin.accessStatusFulltext not available

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