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    Accretion states of the Galactic microquasar GRS 1758-258

    181220_53926_Soriaetal2011b.pdf (1.687Mb)
    Access Status
    Open access
    Authors
    Soria, Roberto
    Broderick, J.
    Hao, J.
    Hannikainen, D.
    Mehdipour, M.
    Pottschmidt, K.
    Zhang, S.
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Soria, Roberto and Broderick, Jess W. and Hao, JingFang and Hannikainen, Diana C. and Mehdipour, Missagh and Pottschmidt, Katja and Zhang, Shuang-Nan. 2011. Accretion states of the Galactic microquasar GRS 1758-258. Monthly Notices of the Royal Astronomical Society. 415 (1): pp. 410-424.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2011.18714.x
    ISSN
    1365-2966
    School
    Curtin Institute of Radio Astronomy
    Remarks

    The definitive version is available at www.blackwell-synergy.com

    URI
    http://hdl.handle.net/20.500.11937/40861
    Collection
    • Curtin Research Publications
    Abstract

    We present the results of a radio and X-ray study of the Galactic microquasar GRS 1758−258, using unpublished archival data and new observations. We focus in particular on the 2000–2002 state transitions, and on its more quiet behaviour in 2008–2009. Our spectral and timing analysis of the XMM–Newton data shows that the source was in the canonical intermediate, soft and hard states in 2000 September 19, 2001 March 22 and 2002 September 28, respectively. We estimate the disc size, luminosity and temperature, which are consistent with a black hole mass ~10 M\astrosun. There is much overlap between the range of total X-ray luminosities (on average ~0.02L Edd) in the hard and soft states, and probably between the corresponding mass accretion rates; in fact, the hard state is often more luminous. The extended radio lobes seen in 1992 and 1997 are still present in 2008–2009. The 5-GHz radio core flux density has shown variability between ~0.1 and 0.5 mJy over the last two decades. This firmly places GRS 1758−258 in the radio-quiet sequence of Galactic black holes, in the radio/X-ray plane. We note that this dichotomy is similar to the dichotomy between the radio/X-ray sequences of Seyfert and radio galaxies. We propose that the different radio efficiency of the two sequences is due to relativistic electron/positron jets in radio-loud black holes, and subrelativistic, thermally dominated outflows in radio-quiet sources.

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