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    Near-infrared Spectroscopy of Five Ultra-massive Galaxies at 1.7 < z < 2.7

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    Issue Date
    2017-03-20
    Author
    Kado-Fong, Erin
    Marchesini, Danilo
    Marsan, Z. Cemile
    Muzzin, Adam
    Quadri, Ryan
    Brammer, Gabriel
    Bezanson, Rachel
    Labbé, Ivo
    Lundgren, Britt
    Rudnick, Gregory H.
    Stefanon, Mauro
    Tal, Tomer
    Wake, David
    Williams, Rik
    Whitaker, Katherine
    van Dokkum, Pieter
    Publisher
    American Astronomical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
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    Abstract
    We present the results of a pilot near-infrared spectroscopic campaign of five very massive galaxies ($\mathrm{log}({M}_{\star }/{M}_{\odot })\gt 11.45$) in the range of $1.7\lt z\lt 2.7$. We measure an absorption feature redshift for one galaxy at ${z}_{\mathrm{spec}}=2.000\pm 0.006$. For the remaining galaxies, we combine the photometry with the continuum from the spectra to estimate continuum redshifts and stellar population properties. We define a continuum redshift (${z}_{\mathrm{cont}}$ ) as one in which the redshift is estimated probabilistically from the combination of catalog photometry and the observed spectrum using EAZY. We derive the uncertainties on the stellar population synthesis properties using a Monte Carlo simulation and examine the correlations between the parameters with and without the use of the spectrum in the modeling of the spectral energy distributions. The spectroscopic constraints confirm the extreme stellar masses of the galaxies in our sample. We find that three out of five galaxies are quiescent (star-formation rate of $\lesssim 1{M}_{\odot }\,{\mathrm{yr}}^{-1}$) with low levels of dust obscuration (${A}_{{\rm{V}}}\lt 1$) , that one galaxy displays both high levels of star formation and dust obscuration ($\mathrm{SFR}\approx 300{M}_{\odot }\,{\mathrm{yr}}^{-1}$, ${A}_{{\rm{V}}}\approx 1.7$ mag), and that the remaining galaxy has properties that are intermediate between the quiescent and star-forming populations.
    URI
    http://hdl.handle.net/1808/27301
    DOI
    https://doi.org/10.3847/1538-4357/aa6037
    Collections
    • Physics and Astronomy Scholarly Works [1605]
    Citation
    Kado-Fong, E., Marchesini, D., Marsan, Z. C., Muzzin, A., Quadri, R., Brammer, G., ... & Stefanon, M. (2017). Near-infrared Spectroscopy of Five Ultra-massive Galaxies at 1.7< z< 2.7. The Astrophysical Journal, 838(1), 57.

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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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