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    Selection of ULIRGs in infrared and submm surveys

    236204_236204.pdf (2.829Mb)
    Access Status
    Open access
    Authors
    Symeonidis, M.
    Page, M.
    Seymour, Nick
    Date
    2011
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Symeonidis, M. and Page, M. and Seymour, N. 2011. Selection of ULIRGs in infrared and submm surveys. Monthly Notices of the Royal Astronomical Society. 411 (2): pp. 983-992.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1111/j.1365-2966.2010.17735.x
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/40397
    Collection
    • Curtin Research Publications
    Abstract

    We examine the selection characteristics of infrared and submm surveys with IRAS, Spitzer, BLAST, Herschel and SCUBA, and identify the range of dust temperatures these surveys are sensitive to, for galaxies in the ultraluminous IR galaxy (ULIRG) luminosity range [12 < log (LIR/ L☉) < 13], between z= 0 and 4. We find that the extent of the redshift range over which surveys are unbiased is a function of the wavelength of selection, flux density limit and ULIRG luminosity. Short wavelength (~< 200 μm) surveys with IRAS, Spitzer/MIPS and Herschel/PACS are sensitive to all spectral energy distribution (SED) types in a large temperature interval (17–87 K), over a substantial fraction of their accessible redshift range. On the other hand, long wavelength (~> 200 μm) surveys with BLAST, Herschel/SPIRE and SCUBA are significantly more sensitive to cold ULIRGs, disfavouring warmer SEDs even at low redshifts.In order to evaluate observations in the context of survey selection effects, we examine the temperature distribution of four ULIRG samples from IRAS, Spitzer/MIPS, BLAST and SCUBA. We find that the lack of cold ULIRGs in the local (z ≤ 0.1) Universe is not a consequence of the selection and that the range of ULIRG temperatures seen locally is only a subset of a much larger range which exists at high redshift. We demonstrate that the local luminosity–temperature (L–T) relation, which indicates that more luminous sources are also hotter, is not applicable in the distant Universe when extrapolated to the ULIRG regime, because the scatter in observed temperatures is too large. Finally, we show that the difference between the ULIRG temperature distributions locally and at high redshift is not the result of galaxies becoming colder due to an L–T relation which evolves as a function of redshift. Instead, they are consistent with a picture where the evolution of the infrared luminosity function is temperature dependent, i.e. cold galaxies evolve at a faster rate than their warm counterparts.

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