NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T20:00:25 PDT
Help | Comment | NED Home

For refcode 2013ApJ...777..155O:
Retrieve 49 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2013ApJ...777..155O Evolution of the Sizes of Galaxies over 7 < z < 12 Revealed by the 2012 Hubble Ultra Deep Field Campaign 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.; Rogers, Alexander B.; Schneider, Evan; Charlot, Stephane; Stark, Daniel P.; Shimasaku, Kazuhiro; Furlanetto, Steven R.; Cirasuolo, Michele Abstract. 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 (UDF12) 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 ~= 6.5-8 in the HUDF. Second, because the UDF12 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. Restricting our measurements to sources detected at >15sigma, we confirm earlier indications that the average half-light radii of z ~ 7-12 galaxies are extremely small, 0.3-0.4 kpc, comparable to the sizes of giant molecular associations in local star-forming galaxies. We also confirm that there is a clear trend of decreasing half-light radius with increasing redshift, and provide the first evidence that this trend continues beyond z ~= 8. Modeling the evolution of the average half-light radius as a power law, vprop(1 + z)^ s ^, we obtain a best-fit index of s=-1.30^{+0.12}_{-0.14}_ over z ~ 4-12. A clear size-luminosity relation is evident in our dropout samples. This relation can be interpreted in terms of a constant surface density of star formation over a range in luminosity of 0.05{--}1.0 L^*_{z=3}_. 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. Key words: galaxies: evolution, galaxies: formation, galaxies: high-redshift, galaxies: structure
Retrieve 49 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home