EVOLUTION OF THE SIZES OF GALAXIES OVER 7 < z < 12 REVEALED BY THE 2012 HUBBLE ULTRA DEEP FIELD CAMPAIGN

We analyze the redshift- and luminosity-dependent sizes of dropout galaxy candidates in the redshift range z ~ 7-12 using deep images from the 2012 Hubble Ultra Deep Field (UDF 12) campaign, which offers two advantages over that used in earlier work. First, we utilize the increased signal-to-noise r...

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Bibliographic Details
Published in:The Astrophysical journal 2013-11, Vol.777 (2), p.1-13
Main Authors: Ono, Yoshiaki, Ouchi, Masami, Curtis-Lake, Emma, Schenker, Matthew A, Ellis, Richard S, McLure, Ross J, Dunlop, James S, Robertson, Brant E, Koekemoer, Anton M, Bowler, Rebecca A A
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Asymptotic properties
COMPARATIVE EVALUATIONS
Density
Disk galaxies
Dropouts
Evolution
GALACTIC EVOLUTION
GALAXIES
INDEXES
LUMINOSITY
RED SHIFT
Sciences of the Universe
SIGNAL-TO-NOISE RATIO
Starburst galaxies
STARS
VISIBLE RADIATION
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Summary:We analyze the redshift- and luminosity-dependent sizes of dropout galaxy candidates in the redshift range z ~ 7-12 using deep images from the 2012 Hubble Ultra Deep Field (UDF 12) campaign, which offers two advantages over that used in earlier work. First, we utilize the increased signal-to-noise ratio offered by the UDF12 imaging to provide improved measurements for known galaxies at z [Asymptotically = to] 6.5-8 in the HUDF. Second, because the UDF 12 data have allowed the construction of the first robust galaxy sample in the HUDF at z > 8, we have been able to extend the measurement of average galaxy size out to higher redshifts. The average star formation surface density in dropout galaxies is 2-3 orders of magnitude lower than that found in extreme starburst galaxies, but is comparable to that seen today in the centers of normal disk galaxies.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/777/2/155