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    Profiled spectral lines generated in the field of Kerr superspinars

    Zdeněk Stuchlík · 01 dubna, 2013 · Fyzika · 0 comments
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    Publication date: Apr 2013

    Abstract:
    String Theory suggests existence of primordial Kerr superspinars,
    extremely compact objects with external spacetime described by the Kerr
    naked singularity geometry. The primordial Kerr superspinars have to be
    converted to a near-extreme black hole due to accretion, but they could
    survive to the era of highly redshifted quasars. We study the shape of
    the profiled spectral lines generated by radiating rings or the
    innermost parts of Keplerian discs orbiting the Kerr superspinars.
    Influence of the superspinar surface location on the profiled lines is
    also considered. We demonstrate strong difference of the character of
    the profiled lines generated by radiating rings for all values of the
    superspinar spin and all values of the inclination angles of the
    observer when compared to those generated in the field of Kerr black
    holes. For small and mediate inclination angles there are large
    quantitative differences in the extension and position of the lines. For
    large inclination angles even strong qualitative difference appears as
    the profiled lines have a clear doubled character. The smaller,
    redshifted region of the profiled line is related to the photons
    reaching the regions near the superspinar surface. Strong differences
    are obtained also for profiled lines generated by the innermost parts of
    Keplerian discs especially in the shape of the line. The influence of
    the superspinar surface location is reflected in the intermediate parts
    of the the profiled lines. The line profiles can give a clear signature
    of the presence of a Kerr superspinar and in principle enable estimates
    of its surface location since the signatures of the superspinar surface
    location are of different character as those corresponding to the
    presence of the black hole horizon.

    Authors:
    Schee, Jan; Stuchlík, Zdeněk;

    http://adsabs.harvard.edu/abs/2013JCAP…04..005S

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