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Evidence for Reduced Species Star Formation Rates in the Centers of Massive Galaxies at zeta = 4We perform the first spatially-resolved stellar population study of galaxies in the early universe z equals 3.5 -6.5, utilizing the Hubble Space Telescope Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) imaging dataset over the GOODS-S field. We select a sample of 418 bright and extended galaxies at z less than or approximately equal to 3.5-6.5 from a parent sample of approximately 8000 photometric-redshift selected galaxies from Finkelstein et al. We first examine galaxies at 3.5 less than or equal to z less than or approximately equal to 4.0 using additional deep K-band survey data from the HAWK-I UDS and GOODS Survey (HUGS) which covers the 4000 Angstrom break at these redshifts. We measure the stellar mass, star formation rate, and dust extinction for galaxy inner and outer regions via spatially-resolved spectral energy distribution fitting based on a Markov Chain Monte Carlo algorithm. By comparing specific star formation rates (sSFRs) between inner and outer parts of the galaxies we find that the majority of galaxies with the high central mass densities show evidence for a preferentially lower sSFR in their centers than in their outer regions, indicative of reduced sSFRs in their central regions. We also study galaxies at z approximately equal to 5 and 6 (here limited to high spatial resolution in the rest-frame ultraviolet only), finding that they show sSFRs which are generally independent of radial distance from the center of the galaxies. This indicates that stars are formed uniformly at all radii in massive galaxies at z approximately equal to 5-6, contrary tomassive galaxies at z. less than approximately equal to 4.
Document ID
20170006555
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Jung, Intae
(Texas Univ. Austin, TX, United States)
Finkelstein, Steven L.
(Texas Univ. Austin, TX, United States)
Song, Mimi
(Universities Space Research Association Greenbelt, MD, United States)
Dickinson, Mark
(National Optical Astronomy Observatories Tucson, AZ, United States)
Dekel, Avishai
(Hebrew Univ. Jerusalem, Israel)
Ferguson, Henry C.
(Space Telescope Science Inst. Baltimore, MD, United States)
Fontana, Adriano
(Osservatorio Astronomico Rome, Italy)
Koekemoer, Anton M.
(Space Telescope Science Inst. Baltimore, MD, United States)
Lu, Yu
(Carnegie Institution for Science Pasadena, CA, United States)
Mobasher, Bahram
(California Univ. Riverside, CA, United States)
Papovich, Casey
(Texas A&M System Univ. College Station, TX, United States)
Ryan Russell E., Jr.
(Space Telescope Science Inst. Baltimore, MD, United States)
Salmon, Brett
(Space Telescope Science Inst. Baltimore, MD, United States)
Straughn, Amber N.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
July 13, 2017
Publication Date
January 4, 2017
Publication Information
Publication: The Astrophysical Journal
Publisher: The Institute of Physics (IOP)
Volume: 834
Issue: 1
ISSN: 0004-637X
e-ISSN: 1538-4357
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN44170
Funding Number(s)
CONTRACT_GRANT: NAS5-03127
CONTRACT_GRANT: NNX13AI50G
CONTRACT_GRANT: NNH15CO48B
CONTRACT_GRANT: NNX15AM02G
Distribution Limits
Public
Copyright
Other
Keywords
early universe – galaxies: bulges – galaxies: evolution – galaxies: high-r

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