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Clumpy galaxies in CANDELS. II. Physical properties of UV-bright clumps at 0.5 ? z < 3


Yicheng Guo

Marc Rafelski

Eric F. Bell

Christopher J. Conselice

Avishai Dekel

S. M. Faber

Mauro Giavalisco

Anton M. Koekemoer

David C. Koo

Yu Lu

Nir Mandelker

Joel R. Primack

Daniel Ceverino

Duilia F. de Mello

Henry C. Ferguson

Nimish Hathi

Dale Kocevski

Ray A. Lucas

Pablo G.

Swara Ravindranath

Emmaris Soto

Amber Straughn

Weichen Wang


Studying giant star-forming clumps in distant galaxies is important to understand galaxy formation and evolution. At present, however, observers and theorists have not reached a consensus on whether the observed "clumps" in distant galaxies are the same phenomenon that is seen in simulations. In this paper, as a step to establish a benchmark of direct comparisons between observations and theories, we publish a sample of clumps constructed to represent the commonly observed "clumps" in the literature. This sample contains 3193 clumps detected from 1270 galaxies at $0.5\leqslant z\lt 3.0$. The clumps are detected from rest-frame UV images, as described in our previous paper. Their physical properties (e.g., rest-frame color, stellar mass (M*), star formation rate (SFR), age, and dust extinction) are measured by fitting the spectral energy distribution (SED) to synthetic stellar population models. We carefully test the procedures of measuring clump properties, especially the method of subtracting background fluxes from the diffuse component of galaxies. With our fiducial background subtraction, we find a radial clump U ? V color variation, where clumps close to galactic centers are redder than those in outskirts. The slope of the color gradient (clump color as a function of their galactocentric distance scaled by the semimajor axis of galaxies) changes with redshift and M* of the host galaxies: at a fixed M*, the slope becomes steeper toward low redshift, and at a fixed redshift, it becomes slightly steeper with M*. Based on our SED fitting, this observed color gradient can be explained by a combination of a negative age gradient, a negative E(B ? V) gradient, and a positive specific SFR gradient of the clumps. We also find that the color gradients of clumps are steeper than those of intra-clump regions. Correspondingly, the radial gradients of the derived physical properties of clumps are different from those of the diffuse component or intra-clump regions.


Guo, Y., Rafelski, M., Bell, E. F., Conselice, C. J., Dekel, A., Faber, S. M., …Wang, W. (2018). Clumpy galaxies in CANDELS. II. Physical properties of UV-bright clumps at 0.5 ≤ z < 3. Astrophysical Journal, 853(2),

Journal Article Type Article
Acceptance Date Nov 24, 2017
Publication Date Jan 26, 2018
Deposit Date Feb 8, 2018
Publicly Available Date Feb 8, 2018
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 853
Issue 2
Keywords galaxies: evolution ; galaxies: formation ; galaxies: starburst ; galaxies: star formation ; galaxies: structure ; ultraviolet: galaxies
Public URL
Publisher URL


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