KILOPARSEC-SCALE PROPERTIES OF EMISSION-LINE GALAXIES

We perform a detailed study of the resolved properties of emission-line galaxies at kilo-parsec scales to investigate how small-scale and global properties of galaxies are related. We use a sample of 119 galaxies in the GOODS fields. Using the HST/ACS and HST/WFC3 imaging data taken as a part of the...

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Bibliographic Details
Published in:The Astrophysical journal 2014-12, Vol.797 (2), p.1-16, Article 108
Main Authors: Hemmati, Shoubaneh, Miller, Sarah H, Mobasher, Bahram, Nayyeri, Hooshang, Ferguson, Henry C, Guo, Yicheng, Koekemoer, Anton M, Koo, David C, Papovich, Casey
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Clumps
COLOR
COMPARATIVE EVALUATIONS
CONCENTRATION RATIO
DENSITY
ENERGY SPECTRA
GALACTIC EVOLUTION
GALAXIES
MASS
RED SHIFT
RESOLUTION
SPATIAL DISTRIBUTION
Spectral energy distribution
STAR EVOLUTION
STARS
Stellar age
Stellar mass
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Summary:We perform a detailed study of the resolved properties of emission-line galaxies at kilo-parsec scales to investigate how small-scale and global properties of galaxies are related. We use a sample of 119 galaxies in the GOODS fields. Using the HST/ACS and HST/WFC3 imaging data taken as a part of the CANDELS project, for each galaxy, we perform spectral energy distribution fitting per resolution element, producing resolved rest-frame U - V color, stellar mass, star formation rate (SFR), age, and extinction maps. We develop a technique to identify "regions" of statistical significance within individual galaxies, using their rest-frame color maps to select red and blue regions, a broader definition for what are called "clumps" in other works. The blue regions show higher specific SFRs (sSFRs) than their red counterparts with the sSFR decreasing since z ~ 1, driven primarily by the stellar mass surface densities rather than the SFRs at a given resolution element.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.1088/0004-637X/797/2/108