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    KINEMATIC DOWNSIZING AT z similar to 2

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    Simons_2016_ApJ_830_14.pdf
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    Author
    Simons, Raymond C. cc
    Kassin, Susan A. cc
    Trump, Jonathan R. cc
    Weiner, Benjamin cc
    Heckman, Timothy M.
    Barro, Guillermo cc
    Koo, David C. cc
    Guo, Yicheng cc
    Pacifici, Camilla cc
    Koekemoer, A. cc
    Stephens, Andrew W.
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-10-03
    Keywords
    galaxies: evolution
    galaxies: formation
    galaxies: fundamental parameters
    galaxies: kinematics and dynamics
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    KINEMATIC DOWNSIZING AT z similar to 2. 2016, 830 (1):14 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2016. 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
    We present results from a survey of the internal kinematics of 49 star-forming galaxies at z similar to 2 in the CANDELS fields with the Keck/MOSFIRE spectrograph, Survey in the near-Infrared of Galaxies with Multiple position Angles (SIGMA). Kinematics (rotation velocity V-rot and gas velocity dispersion sg) are measured from nebular emission lines which trace the hot ionized gas surrounding star-forming regions. We find that by z similar to 2, massive star-forming galaxies (log M-*/M-circle dot less than or similar to 10.2) have assembled primitive disks: their kinematics are dominated by rotation, they are consistent with a marginally stable disk model, and they form a Tully-Fisher relation. These massive galaxies have values of V-rot sg that are factors of 2-5 lower than local well-ordered galaxies at similar masses. Such results are consistent with findings by other studies. We find that low-mass galaxies (log M-*/M-circle dot less than or similar to 10.2) at this epoch are still in the early stages of disk assembly: their kinematics are often dominated by gas velocity dispersion and they fall from the Tully-Fisher relation to significantly low values of V-rot. This "kinematic downsizing" implies that the process(es) responsible for disrupting disks at z similar to 2 have a stronger effect and/or are more active in low-mass systems. In conclusion, we find that the period of rapid stellar mass growth at z similar to 2 is coincident with the nascent assembly of low-mass disks and the assembly and settling of high-mass disks.
    ISSN
    1538-4357
    DOI
    10.3847/0004-637X/830/1/14
    Version
    Final published version
    Sponsors
    STScI JDF; NASA through Hubble Fellowship grant - Space Telescope Science Institute [51330]; NASA [NAS 5-26555]
    Additional Links
    http://stacks.iop.org/0004-637X/830/i=1/a=14?key=crossref.fff89233ad01a38d0de63e5e715b4ecc
    ae974a485f413a2113503eed53cd6c53
    10.3847/0004-637X/830/1/14
    Scopus Count
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    UA Faculty Publications

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