Journal
ASTROPHYSICAL JOURNAL
Volume 821, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/0004-637X/821/2/72
Keywords
cosmology: observations; early universe; galaxies: formation; galaxies: high-redshift
Categories
Funding
- 3D-HST Treasury Program [GO 12177, 12328]
- NASA [NAS5-26555]
- NASA by JPL/Caltech
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan, KAKENHI through Japan Society for the Promotion of Science (JSPS) [23244025, 21244013, 15H02064]
- Advanced Leading Graduate Course for Photon Science grant
- Grants-in-Aid for Scientific Research [15H02064, 16J07046] Funding Source: KAKEN
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We investigate the. evolution of clumpy galaxies with. Hubble Space Telescope (HST) samples of similar to 17,000 photo-z and Lyman break galaxies at z similar or equal to 0-8. We detect clumpy galaxies with off-center clumps in a self-consistent algorithm that is well tested with previous study results, and we. measure the number fraction of clumpy galaxies at the rest-frame UV, f(clumpy)(UV). We identify an evolutionary trend of f(clumpy)(UV) over z similar or equal to 0-8 for the first time: f(clumpy)(UV) increases from z similar or equal to 8 to z similar or equal to 1-3 and subsequently decreases from z similar or equal to 1 to z similar or equal to 0, which follows the trend of the. Madau-Lilly plot. A low average Sersic index of n similar or equal to 1 is found in the underlining components of our clumpy galaxies at z similar or equal to 0-2, indicating that typical clumpy galaxies have disk-like surface brightness profiles. Our f(clumpy)(UV) values correlate with physical quantities related to star formation activities for star-forming galaxies at z similar or equal to 0-7. We find that clump colors tend to be red at a small galactocentric distance for massive galaxies with logM(*)/M-circle dot greater than or similar to 11. All of these results are consistent with the picture that a majority of clumps form in the violent disk instability and migrate into the galactic centers.
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