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    Two stellar-mass black holes in the globular cluster M22

    Access Status
    Fulltext not available
    Authors
    Strader, J.
    Chomiuk, L.
    Maccarone, T.
    Miller-Jones, James
    Seth, A.
    Date
    2012
    Type
    Journal Article
    
    Metadata
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    Citation
    Strader, J. and Chomiuk, L. and Maccarone, T. and Miller-Jones, J. and Seth, A. 2012. Two stellar-mass black holes in the globular cluster M22. Nature. 490 (7418): pp. 71-73.
    Source Title
    Nature
    DOI
    10.1038/nature11490
    ISSN
    00280836
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/39444
    Collection
    • Curtin Research Publications
    Abstract

    Hundreds of stellar-mass black holes probably form in a typical globular star cluster, with all but one predicted to be ejected through dynamical interactions. Some observational support for this idea is provided by the lack of X-ray-emitting binary stars comprising one black hole and one other star (‘black-hole/X-ray binaries’) in Milky Way globular clusters, even though many neutron-star/X-ray binaries are known. Although a few black holes have been seen in globular clusters around other galaxies, the masses of these cannot be determined, and some may be intermediate-mass black holes that form through exotic mechanisms. Here we report the presence of two flat-spectrum radio sources in the Milky Way globular cluster M22, and we argue that these objects are black holes of stellar mass (each ~10–20 times more massive than the Sun) that are accreting matter. We find a high ratio of radio-to-X-ray flux for these black holes, consistent with the larger predicted masses of black holes in globular clusters compared to those outside. The identification of two black holes in one cluster shows that ejection of black holes is not as efficient as predicted by most models, and we argue that M22 may contain a total population of ~5–100 black holes. The large core radius of M22 could arise from heating produced by the black holes.

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