期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 885, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab4db3
关键词
Galaxy evolution; Galaxy formation; Galaxy radii; Galaxy structure
资金
- NASA [NNX14AR86G]
- NASA through Space Telescope Science Institute (STScI) [AR-12847]
- National Science Foundation [DGE 1106400]
- NASA [674130, NNX14AR86G] Funding Source: Federal RePORTER
We use high-resolution, multiband imaging of ?16,500 galaxies in the CANDELS fields at 0 & xfffd;?& xfffd;z & xfffd;?& xfffd;2.5 to study the evolution of color gradients and half-mass radii over cosmic time. We find that galaxy color gradients at fixed mass evolve rapidly between z & xfffd;?& xfffd;2.5 and z & xfffd;?& xfffd;1, but remain roughly constant below z & xfffd;?& xfffd;1. This result implies that the sizes of both star-forming and quiescent galaxies increase much more slowly than previous studies found using half-light radii. The half-mass radius evolution of quiescent galaxies is fully consistent with a model that uses observed minor merger rates to predict the increase in sizes due to the accretion of small galaxies. Progenitor bias may still contribute to the growth of quiescent galaxies, particularly if we assume a slower timescale for the minor merger growth model. The slower half-mass radius evolution of star-forming galaxies is in tension with cosmological simulations and semianalytic galaxy models. Further detailed, consistent comparisons with simulations are required to place these results in context.
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