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    The Faint "Heartbeats" of IGR J17091-3624: An Exceptional Black Hole Candidate

    Access Status
    Fulltext not available
    Authors
    Altamirano, D.
    Belloni, T.
    Linares, M.
    van der Klis, M.
    Wijnands, R.
    Curran, Peter
    Kalamkar, M.
    Stiele, H.
    Motta, S.
    Munoz-Darias, T.
    Casella, P.
    Krimm, H.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Altamirano, 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.
    Source Title
    The Astrophysical Journal Letters
    Additional URLs
    http://iopscience.iop.org/2041-8205/742/2/L17/pdf/apjl_742_2_17.pdf
    ISSN
    2041-8205
    URI
    http://hdl.handle.net/20.500.11937/4153
    Collection
    • Curtin Research Publications
    Abstract

    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).

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