Giant star-forming clumps are a prominent feature of star-forming galaxies (SFGs) and contain important clues on galaxy formation and evolution. However, the basic demographics of clumps and their host galaxies remain uncertain. Using the Hubble Space Telescope/Wide Field Camera 3 F275W images from the Ultraviolet Imaging of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey, we detect and analyze giant star-forming clumps in galaxies at 0.5 ≤ z ≤ 1, connecting two epochs when clumps are common (at cosmic high noon, z ∼ 2) and rare (in the local Universe). We construct a clump sample whose rest-frame 1600 Å luminosity is 3 times higher than the most luminous local H ii regions (MUV ≤ −16 AB). In our sample, 35% ± 3% of low-mass galaxies (log[M∗/M⊙] < 10) are clumpy (i.e., containing at least one off-center clump). This fraction changes to 22% ± 3% and 22% ± 4% for intermediate (10 ≤ log[M∗/M⊙] ≤ 10.5) and high-mass (log[M∗/M⊙] > 10.5) galaxies, in agreement with previous studies. When compared to similar-mass nonclumpy SFGs, low- and intermediate-mass clumpy SFGs tend to have higher star formation rates (SFRs) and bluer rest-frame U − V colors, while high-mass clumpy SFGs tend to be larger than nonclumpy SFGs. However, clumpy and nonclumpy SFGs have similar Sérsic index, indicating a similar underlying density profile. Furthermore, we investigate how the UV luminosity of star-forming regions correlates with the physical properties of host galaxies. On average, more luminous star-forming regions reside in more luminous, smaller, and/or higher specific SFR galaxies and are found closer to their hosts' galactic centers.
UV-bright Star-forming Clumps and Their Host Galaxies in UVCANDELS at 0.5 ≤ z ≤ 1
Creators
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Martin, Alec1
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Guo, Yicheng1
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Wang, Xin2, 3, 4
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Koekemoer, Anton M.5
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Rafelski, Marc5, 6
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Teplitz, Harry I.7
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Windhorst, Rogier A.8
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Alavi, Anahita7
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Grogin, Norman A.5
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Prichard, Laura5
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Sunnquist, Ben5
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Ceverino, Daniel9
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Chartab, Nima10
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Conselice, Christopher J.11
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Dai, Y. Sophia3
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Dekel, Avishai12
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Gardner, Jonathan P.13
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Gawiser, Eric14
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Hathi, Nimish P.5
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Hayes, Matthew J.15
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Jansen, Rolf A.8
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Ji, Zhiyuan16
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Koo, David C.17
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Lucas, Ray A.5
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Mandelker, Nir12
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Mehta, Vihang7
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Mobasher, Bahram18
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Nedkova, Kalina V.6
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Primack, Joel17
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Ravindranath, Swara5
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Robertson, Brant E.17
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Rutkowski, Michael J.19
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Sattari, Zahra10, 18
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Soto, Emmaris20
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Yung, L. Y. Aaron13
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1.
University of Missouri
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2.
University of Chinese Academy of Sciences
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3.
National Astronomical Observatories
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4.
Beijing Normal University
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5.
Space Telescope Science Institute
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6.
Johns Hopkins University
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7.
Infrared Processing and Analysis Center
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8.
Arizona State University
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9.
Autonomous University of Madrid
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10.
Carnegie Observatories
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11.
University of Manchester
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12.
Hebrew University of Jerusalem
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13.
Goddard Space Flight Center
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14.
Rutgers, The State University of New Jersey
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15.
Stockholm University
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16.
University of Arizona
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17.
University of California, Santa Cruz
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18.
University of California, Riverside
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19.
Minnesota State University, Mankato
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20.
Computational Physics (United States)
Abstract
Copyright and License
© 2023. The Author(s). Published by the American Astronomical Society.
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Acknowledgement
This work is based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contract NAS5-26555. Support for program numbers HST-GO-15647 and HST-AR-15798 was provided through a grant from the STScI under NASA contract NAS5-26555.
D.C. is a Ramon-Cajal Researcher and is supported by the Ministerio de Ciencia, Innovación y Universidades (MICIU/FEDER) under research grant No. PGC2018-094975-C21.
Y.S.D. acknowledges the support from National Key R&D Program of China for grant No. 2022YFA1605300, and the NSFC grant Nos. 12273051 and 11933003.
The specific observations analyzed can be accessed via 10.17909/96zb-g146.
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Additional details
Related works
- Is new version of
- Discussion Paper: arXiv:2308.00041 (arXiv)
- Is supplemented by
- Dataset: 10.17909/96zb-g146 (DOI)
Funding
- National Aeronautics and Space Administration
- NAS5-26555
- Space Telescope Science Institute
- HST-GO-15647
- Space Telescope Science Institute
- HST-AR-15798
- Ministerio de Ciencia, Innovación y Universidades
- PGC2018-094975-C21
- Ministry of Science and Technology of the People's Republic of China
- 2022YFA1605300
- National Natural Science Foundation of China
- 12273051
- National Natural Science Foundation of China
- 11933003
Dates
- Accepted
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2023-08-01
- Available
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2023-09-22Published