Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2
We report the measurement of rest-frame UV size and morphology of H α -emission-selected star-forming galaxies (HAEs) in four protoclusters at z ∼ 2 (PKS 1138-262, USS 1558-003, PHz G237.0+42.5, and CC 2.2) using archival Hubble Space Telescope Advanced Camera Survey (HST/ACS) F814W data. We compare...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acfb81 |
| _version_ | 1797522320309354496 |
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| author | Abdurrahman Naufal Yusei Koyama Rhythm Shimakawa Tadayuki Kodama |
| author_facet | Abdurrahman Naufal Yusei Koyama Rhythm Shimakawa Tadayuki Kodama |
| author_sort | Abdurrahman Naufal |
| collection | DOAJ |
| description | We report the measurement of rest-frame UV size and morphology of H α -emission-selected star-forming galaxies (HAEs) in four protoclusters at z ∼ 2 (PKS 1138-262, USS 1558-003, PHz G237.0+42.5, and CC 2.2) using archival Hubble Space Telescope Advanced Camera Survey (HST/ACS) F814W data. We compare the measurement of 122 HAEs in protoclusters detected by HST/ACS to a coeval comparison field sample of 436 HAEs. We find the size distributions of protocluster and field HAEs are similar with a typical half-light radius of ∼2.5 kpc. At fixed stellar mass, there is no significant difference between HAEs in the protocluster and in the field, which is also supported by stacking analyses. This result suggests that the environment does not significantly affect the size of galaxies during the star-forming phase at this epoch. Based on the Sérsic index and nonparametric morphologies, HAE morphologies in both environments at z ∼ 2 in rest-frame UV are consistent with disk-like star-forming galaxies, although we also find 29% ± 4% HAEs showing disturbed morphologies. The fraction of disturbed galaxies is higher in the protocluster environment, with 39% ± 8% protocluster HAEs showing disturbed morphologies, compared to 26% ± 4% in the comparison field. The apparent disturbed morphologies are correlated with higher star formation activity and may be caused by either in situ giant clumps or mergers. |
| first_indexed | 2024-03-10T08:27:44Z |
| format | Article |
| id | doaj.art-cf429839c5354786860ac87d4cdf0e31 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-10T08:27:44Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-cf429839c5354786860ac87d4cdf0e312023-11-22T09:22:30ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01958217010.3847/1538-4357/acfb81Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2Abdurrahman Naufal0https://orcid.org/0000-0001-7713-0434Yusei Koyama1https://orcid.org/0000-0002-0479-3699Rhythm Shimakawa2https://orcid.org/0000-0003-4442-2750Tadayuki Kodama3https://orcid.org/0000-0002-2993-1576Department of Astronomical Science, The Graduate University for Advanced Studies , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; National Astronomical Observatory of Japan , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, JapanDepartment of Astronomical Science, The Graduate University for Advanced Studies , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; Subaru Telescope, National Astronomical Observatory of Japan , 650 North A’ohoku Place, Hilo, HI 96720, USAWaseda Institute for Advanced Study (WIAS), Waseda University , 1-21-1, Nishi-Waseda, Shinjuku, Tokyo 169-0051, Japan; Center for Data Science, Waseda University , 1-6-1, Nishi-Waseda, Shinjuku, Tokyo 169-0051, JapanTohoku University , 2-1-1 Katahira, Aoba Ward, Sendai, Miyagi 980-8577, JapanWe report the measurement of rest-frame UV size and morphology of H α -emission-selected star-forming galaxies (HAEs) in four protoclusters at z ∼ 2 (PKS 1138-262, USS 1558-003, PHz G237.0+42.5, and CC 2.2) using archival Hubble Space Telescope Advanced Camera Survey (HST/ACS) F814W data. We compare the measurement of 122 HAEs in protoclusters detected by HST/ACS to a coeval comparison field sample of 436 HAEs. We find the size distributions of protocluster and field HAEs are similar with a typical half-light radius of ∼2.5 kpc. At fixed stellar mass, there is no significant difference between HAEs in the protocluster and in the field, which is also supported by stacking analyses. This result suggests that the environment does not significantly affect the size of galaxies during the star-forming phase at this epoch. Based on the Sérsic index and nonparametric morphologies, HAE morphologies in both environments at z ∼ 2 in rest-frame UV are consistent with disk-like star-forming galaxies, although we also find 29% ± 4% HAEs showing disturbed morphologies. The fraction of disturbed galaxies is higher in the protocluster environment, with 39% ± 8% protocluster HAEs showing disturbed morphologies, compared to 26% ± 4% in the comparison field. The apparent disturbed morphologies are correlated with higher star formation activity and may be caused by either in situ giant clumps or mergers.https://doi.org/10.3847/1538-4357/acfb81ProtoclustersHigh-redshift galaxies |
| spellingShingle | Abdurrahman Naufal Yusei Koyama Rhythm Shimakawa Tadayuki Kodama Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2 The Astrophysical Journal Protoclusters High-redshift galaxies |
| title | Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2 |
| title_full | Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2 |
| title_fullStr | Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2 |
| title_full_unstemmed | Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2 |
| title_short | Environmental Impacts on the Rest-frame UV Size and Morphology of Star-forming Galaxies at z ∼ 2 |
| title_sort | environmental impacts on the rest frame uv size and morphology of star forming galaxies at z ∼ 2 |
| topic | Protoclusters High-redshift galaxies |
| url | https://doi.org/10.3847/1538-4357/acfb81 |
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