Multiwavelength spectral evolution during the 2011 outburst of the very faint X-ray transient swift j1357.2-0933

Armas M. Padilla, N. Degenaar, Dave Russell, R. Wijnands

    Research output: Contribution to journalArticle

    Abstract

    We report our multiwavelength study of the 2011 outburst evolution of the newly discovered black hole candidateX-ray binary Swift J1357.2-0933. We analysed the Swift X-ray Telescope and Ultraviolet/Optical Telescope (UVOT) data taken during the ~7 months duration of the outburst. It displayed a 2-10 keV X-ray peak luminosity of ~1035(D/1.5 kpc)2 erg s-1, which classifies the source as a very faint X-ray transient. We found that the X-ray spectrum at the peak was consistent with the source being in the hard state, but it softened with decreasing luminosity, a common behaviour of black holes returning to quiescence from the hard state. The correlations between the simultaneous X-ray and ultraviolet/optical data suggest a system with a black hole accreting from a viscous disc, and we do not detect X-ray reprocessing on the disc surface. The UVOT filters provide the opportunity to study these correlations up to ultraviolet wavelengths, a regime so far unexplored. If the black hole nature is confirmed, Swift J1357.2-0933 would be one of the very few established black hole very-faint X-ray transients.

    Original languageEnglish (US)
    Pages (from-to)3083-3088
    Number of pages6
    JournalMonthly Notices of the Royal Astronomical Society
    Volume428
    Issue number4
    DOIs
    StatePublished - Feb 19 2013

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    x rays
    telescopes
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    erg
    rays
    filter
    wavelength
    filters
    wavelengths

    Keywords

    • Accretion
    • Accretion discs - stars
    • Binaries
    • Individual
    • Swift J1357.2-0933 -X-rays

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Multiwavelength spectral evolution during the 2011 outburst of the very faint X-ray transient swift j1357.2-0933. / Padilla, Armas M.; Degenaar, N.; Russell, Dave; Wijnands, R.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 428, No. 4, 19.02.2013, p. 3083-3088.

    Research output: Contribution to journalArticle

    Padilla, Armas M. ; Degenaar, N. ; Russell, Dave ; Wijnands, R. / Multiwavelength spectral evolution during the 2011 outburst of the very faint X-ray transient swift j1357.2-0933. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 428, No. 4. pp. 3083-3088.
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