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  Half-mass radii for ~7000 galaxies at 1.0 ≤ z ≤ 2.5: Most of the evolution in the mass–size relation is due to color gradients

Suess, K. A., Kriek, M., Price, S. H., & Barro, G. (2019). Half-mass radii for ~7000 galaxies at 1.0 ≤ z ≤ 2.5: Most of the evolution in the mass–size relation is due to color gradients. The Astrophysical Journal, 877(2): 103. doi:10.3847/1538-4357/ab1bda.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-D929-B Version Permalink: http://hdl.handle.net/21.11116/0000-0003-D937-B
Genre: Journal Article

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Half-mass Radii for ~7000 Galaxies at 1.0 ≤ z ≤ 2.5 Most of the Evolution in the Mass–Size Relation Is Due to Color Gradients.pdf (Any fulltext), 4MB
 
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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: Radial mass-to-light ratio gradients cause the half-mass and half-light radii of galaxies to differ, potentially biasing studies that use half-light radii. Here we present the largest catalog to date of galaxy half-mass radii at z > 1: 7,006 galaxies in the CANDELS fields at 1.0 < z < 2.5. The sample includes both star-forming and quiescent galaxies with stellar masses 9.0 < log(M_* / M_\odot) < 11.5. We test three methods for calculating half-mass radii from multi-band PSF-matched HST imaging: two based on spatially-resolved SED modeling, and one that uses a rest-frame color profile. All three methods agree, with scatter <~0.3 dex. In agreement with previous studies, most galaxies in our sample have negative color gradients (the centers are redder than the outskirts, and r_e,mass < r_e,light). We find that color gradient strength has significant trends with increasing stellar mass, half-light radius, U-V color, and stellar mass surface density. These trends have not been seen before at z>1. Furthermore, color gradients of star-forming and quiescent galaxies show a similar redshift evolution: they are flat at z>~2, then steeply decrease as redshift decreases. This affects the galaxy mass-size relation. The normalizations of the star-forming and quiescent r_mass-M_* relations are 10-40% smaller than the corresponding r_light-M_* relations; the slopes are ~0.1-0.3 dex shallower. Finally, the half-mass radii of star-forming and quiescent galaxies at M_* = 10^{10.5}M_\odot only grow by ~1%$ and ~8% between z~2.25 and z~1.25. This is significantly less than the ~37% and ~47% size increases found when using the half-light radius.

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 Dates: 2019-05-31
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab1bda
Other: LOCALID: 3072985
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol, England : IOP Publishing LTD
Pages: - Volume / Issue: 877 (2) Sequence Number: 103 Start / End Page: - Identifier: ISSN: 1538-4357
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3