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    The MOSDEF survey: The dependence of H α-to-UV SFR ratios on SFR and size at z ∼2

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    Author
    Fetherolf, T.
    Reddy, N.A.
    Shapley, A.E.
    Kriek, M.
    Siana, B.
    Coil, A.L.
    Mobasher, B.
    Freeman, W.R.
    Sanders, R.L.
    Price, S.H.
    Shivaei, I.
    Azadi, M.
    de Groot, L.
    Leung, G.C.K.
    Zick, T.O.
    Show allShow less
    Affiliation
    Steward Observatory, University of Arizona
    Issue Date
    2021
    Keywords
    Galaxies: Evolution
    Galaxies: Fundamental parameters
    Galaxies: High-redshift
    Galaxies: Star formation
    Methods: Data analysis
    
    Metadata
    Show full item record
    Publisher
    Oxford University Press
    Citation
    Fetherolf, T., Reddy, N. A., Shapley, A. E., Kriek, M., Siana, B., Coil, A. L., Mobasher, B., Freeman, W. R., Sanders, R. L., Price, S. H., Shivaei, I., Azadi, M., de Groot, L., Leung, G. C. K., & Zick, T. O. (2021). The MOSDEF survey: The dependence of H α-to-UV SFR ratios on SFR and size at z ∼2. Monthly Notices of the Royal Astronomical Society.
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    Copyright © 2021 The Author(s).
    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 perform an aperture-matched analysis of dust-corrected H α and UV star formation rates (SFRs) using 303 star-forming galaxies with spectroscopic redshifts 1.36 < zspec < 2.66 from the MOSFIRE Deep Evolution Field survey. By combining H α and H β emission line measurements with multiwaveband resolved Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey/3D-HST imaging, we directly compare dust-corrected H α and UV SFRs, inferred assuming a fixed attenuation curve shape and constant SFHs, within the spectroscopic aperture. Previous studies have found that H α and UV SFRs inferred with these assumptions generally agree for typical star-forming galaxies, but become increasingly discrepant for galaxies with higher SFRs (Z100 M⊙ yr-1), with H α-to-UV SFR ratios being larger for these galaxies. Our analysis shows that this trend persists even after carefully accounting for the apertures over which H α and UV-based SFRs (and the nebular and stellar continuum reddening) are derived. Furthermore, our results imply that H α SFRs may be higher in the centres of large galaxies (i.e. where there is coverage by the spectroscopic aperture) compared to their outskirts, which could be indicative of inside-out galaxy growth. Overall, we suggest that the persistent difference between nebular and stellar continuum reddening and high H α-to-UV SFR ratios at the centres of large galaxies may be indicative of a patchier distribution of dust in galaxies with high SFRs. © 2021 The Author(s).
    Note
    Immediate access
    ISSN
    0035-8711
    DOI
    10.1093/mnras/stab2570
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stab2570
    Scopus Count
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    UA Faculty Publications

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