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    A bright, dust-obscured, millimetre-selected galaxy beyond the Bullet Cluster (1E0657−56)

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    Wilson_2008_MNNRAS_390(3)1061.pdf (4.463Mb)
    Issue Date
    2008-03-24
    Author
    Wilson, Graham Wallace
    Hughes, D. H.
    Aretxaga, I.
    Ezawa, H.
    Austermann, J. E.
    Doyle, S.
    Ferrusca, D.
    Hernández-Curiel, I.
    Kawabe, R.
    Kitayama, T.
    Kohno, K.
    Kuboi, A.
    Matsuo, H.
    Mauskopf, P. D.
    Murakoshi, Y.
    Montaña, A.
    Natarajan, Pradeep
    Oshima, T.
    Ota, N.
    Perera, Thushara A.
    Rand, J.
    Scott, K. S.
    Tanaka, K.
    Tsuboi, M.
    Williams, C. C.
    Yamaguchi, N.
    Yun, M. S.
    Publisher
    Oxford University Press
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    Deep 1.1 mm continuum observations of 1E0657−56 (the ‘Bullet Cluster’) taken with the millimeter-wavelength camera AzTEC on the 10-m Atacama Submillimeter Telescope Experiment (ASTE), have revealed an extremely bright (S1.1 mm= 15.9 mJy) unresolved source. This source, MMJ065837−5557.0, lies close to a maximum in the density of underlying mass distribution, towards the larger of the two interacting clusters as traced by the weak-lensing analysis of Clowe et al. Using optical–infrared (IR) colours, we argue that MMJ065837−5557.0 lies at a redshift of z= 2.7 ± 0.2. A lensing-derived mass model for the Bullet Cluster shows a critical line (caustic) of magnification within a few arcsec of the AzTEC source, sufficient to amplify the intrinsic millimetre-wavelength flux of the AzTEC galaxy by a factor of ≫20. After subtraction of the foreground cluster emission at 1.1 mm due to the Sunyaev-Zel'dovich effect, and correcting for the magnification, the rest-frame far-IR luminosity of MMJ065837−5557.0 is ≤1012L⊙, characteristic of a luminous infrared galaxy (LIRG). We explore various scenarios to explain the colours, morphologies and positional offsets between the potential optical and IR counterparts, and their relationship with MMJ065837−5557.0. Until higher resolution and more sensitive (sub)millimetre observations are available, the detection of background galaxies close to the caustics of massive lensing clusters offers the only opportunity to study this intrinsically faint millimetre-galaxy population.
    Description
    This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2008 G. W. Wilson et al. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
    URI
    http://hdl.handle.net/1808/17712
    DOI
    https://doi.org/10.1111/j.1365-2966.2008.13774.x
    Collections
    • Physics & Astronomy Scholarly Works [1711]
    Citation
    G. W. Wilson et al. (2008). "A bright, dust-obscured, millimetre-selected galaxy beyond the Bullet Cluster (1E0657−56)." Monthly notices of the Royal Astronomical Society, 390(3):1061-1070. http://www.dx.doi.org/10.1111/j.1365-2966.2008.13774.x.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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