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    A disrupted bulgeless satellite galaxy as counterpart of the ultraluminous X-ray source ESO 243-49 HLX-1

    194148_99591_satellite_galaxy.pdf (541.8Kb)
    Access Status
    Open access
    Authors
    Mapelli, M.
    Annibali, F.
    Zampieri, L.
    Soria, Roberto
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Mapelli, M. and Annibali, F. and Zampieri, L. and Soria, R. 2013. A disrupted bulgeless satellite galaxy as counterpart of the ultraluminous X-ray source ESO 243-49 HLX-1. Astronomy and Astrophysics. 559: 7 pages.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201322435
    ISSN
    0004-6361
    Remarks

    © ESO 2013

    URI
    http://hdl.handle.net/20.500.11937/44661
    Collection
    • Curtin Research Publications
    Abstract

    The point-like X-ray source HLX-1, close to the S0 galaxy ESO 243-49, is one the strongest intermediate-mass black hole candidates, but the nature of its counterpart is still puzzling. By means of N-body/smoothed particle hydrodynamics simulations, we investigate the hypothesis that the HLX-1 counterpart is the nucleus of a bulgeless satellite galaxy, which undergoes a minor merger with the S0galaxy.We derived synthetic surface brightness profiles for the simulated counterpart of HLX-1 in six Hubble Space Telescope (HST) filters, ranging from far ultraviolet (FUV) to infrared wavelengths, and we compared them with the observed profiles. Our model matches the emission associated with the HLX-1 counterpart in all considered filters, including the bluer ones, even without requiring the contribution of an irradiated disc. The simulation can also account for an extended FUV emission, which is hinted at by the analysis of the F140LP HST filter. This matching is impossible to achieve by assuming either a bulgy satellite, a young star cluster, or an irradiated disc component.

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