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  Half-mass radii of quiescent and star-forming galaxies evolve slowly from 0 ≲ z ≤ 2.5: implications for galaxy assembly histories

Suess, K. A., Kriek, M., Price, S. H., & Barro, G. (2019). Half-mass radii of quiescent and star-forming galaxies evolve slowly from 0 ≲ z ≤ 2.5: implications for galaxy assembly histories. The Astrophysical Journal Letters, 885(1): L22. doi:10.3847/2041-8213/ab4db3.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-5F55-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-5F56-1
Genre: Journal Article

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Suess, Katherine A., Author
Kriek, Mariska, Author
Price, Sedona H.1, Author              
Barro, Guillermo, Author
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1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: We use high-resolution, multiband imaging of ~16,500 galaxies in the CANDELS fields at 0 ≲ z ≤ 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 ~ 2.5 and z ~ 1, but remain roughly constant below z ~ 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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 Dates: 2019-10-31
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/2041-8213/ab4db3
Other: LOCALID: 3182837
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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 885 (1) Sequence Number: L22 Start / End Page: - Identifier: ISSN: 2041-8205
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215