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    The Validity of 21 cm Spin Temperature as a Kinetic Temperature Indicator in Atomic and Molecular Gas

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    Shaw_2017_ApJ_843_149.pdf
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    Author
    Shaw, Gargi
    Ferland, G. J. cc
    Hubeny, I.
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-07-14
    Keywords
    ISM: clouds
    radiative transfer
    radio lines: galaxies
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    The Validity of 21 cm Spin Temperature as a Kinetic Temperature Indicator in Atomic and Molecular Gas 2017, 843 (2):149 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The gas kinetic temperature (T-K) of various interstellar environments is often inferred from observations that can deduce level populations of atoms, ions, or molecules using spectral line observations; H I 21 cm is perhaps the most widely used, and has a long history. Usually the H I 21 cm line is assumed to be in thermal equilibrium. and the populations are given by the Boltzmann distribution. A variety of processes, many involving Ly alpha, can affect the 21 cm line. Here we show how this is treated in the spectral simulation code Cloudy, and present numerical simulations of environments where this temperature indicator is used, with a detailed treatment of the physical processes that determine level populations within H-0. We discuss situations where this temperature indicator traces TK, cases where it fails, as well as the effects of Lya pumping on the 21 cm spin temperature. We also show that the Lya excitation temperature rarely traces the gas kinetic temperature.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aa7747
    Version
    Final published version
    Sponsors
    NSF [1108928, 1109061, 1412155]; NASA [10-ATP10-0053, 10-ADAP10-0073, NNX12AH73G, ATP13-0153]; STScI [HST-AR-13245, GO-12560, HST-GO-12309, GO-13310.002-A, HST-AR-13914]
    Additional Links
    http://stacks.iop.org/0004-637X/843/i=2/a=149?key=crossref.92c50c017c10319c30f64e7da049d548
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aa7747
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