Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses
The properties of submillimeter galaxies (SMGs) that are fainter than the confusion limit of blank-field single-dish surveys (S850 2 mJy) are poorly constrained. Using a newly developed color selection technique, Optical-Infrared Triple Color (OIRTC), that has been shown to successfully select suc...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Published: |
American Astronomical Society
2016
|
| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/39817/ |
| _version_ | 1848795919905980416 |
|---|---|
| author | Chen (陳建州), Chian-Chou Smail, Ian Swinbank, A.M. Simpson, James M. Almaini, Omar Conselice, Christopher J. Hartley, Will G. Mortlock, Alice Simpson, Chris Wilkinson, Aaron |
| author_facet | Chen (陳建州), Chian-Chou Smail, Ian Swinbank, A.M. Simpson, James M. Almaini, Omar Conselice, Christopher J. Hartley, Will G. Mortlock, Alice Simpson, Chris Wilkinson, Aaron |
| author_sort | Chen (陳建州), Chian-Chou |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | The properties of submillimeter galaxies (SMGs) that are fainter than the confusion limit of blank-field single-dish surveys (S850 2 mJy) are poorly constrained. Using a newly developed color selection technique, Optical-Infrared Triple Color (OIRTC), that has been shown to successfully select such faint SMGs, we identify a sample of 2938 OIRTC-selected galaxies, dubbed Triple Color Galaxies (TCGs), in the UKIDSS-UDS field. We show that these galaxies have a median 850 μm flux of S850 = 0.96 +/- 0.04 mJy (equivalent to a star formation rate SFR ~60–100 M yr−1 based on spectral energy distribution fitting), representing the first large sample of faint SMGs that bridges the gap between bright SMGs and normal star-forming galaxies in S850 and LIR. We assess the basic properties of TCGs and their relationship with other galaxy populations at z ~ 2. We measure the two-point autocorrelation function for this population and derive a typical halo mass of log10(Mhalo) = -12.9+0.2-0.3, 12.7+0.1,-0.2, and 12.9+0.2,-0,3 h-1 M at z = 1–2, 2–3, and 3–5, respectively. Together with the bright SMGs (S850 >/~ 2 mJy) and a comparison sample of less far-infrared luminous star-forming galaxies, we find a lack of dependence between spatial clustering and S850 (or SFR), suggesting that the difference between these populations may lie in their local galactic environment. Lastly, on the scale of ~8–17 kpc at 1 < z < 5 we find a tentative enhancement of the clustering of TCGs over the comparison star-forming galaxies, suggesting that some faint SMGs are physically associated pairs, perhaps reflecting a merging origin in their triggering. |
| first_indexed | 2025-11-14T19:39:45Z |
| format | Article |
| id | nottingham-39817 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:39:45Z |
| publishDate | 2016 |
| publisher | American Astronomical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-398172020-05-04T18:14:00Z https://eprints.nottingham.ac.uk/39817/ Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses Chen (陳建州), Chian-Chou Smail, Ian Swinbank, A.M. Simpson, James M. Almaini, Omar Conselice, Christopher J. Hartley, Will G. Mortlock, Alice Simpson, Chris Wilkinson, Aaron The properties of submillimeter galaxies (SMGs) that are fainter than the confusion limit of blank-field single-dish surveys (S850 2 mJy) are poorly constrained. Using a newly developed color selection technique, Optical-Infrared Triple Color (OIRTC), that has been shown to successfully select such faint SMGs, we identify a sample of 2938 OIRTC-selected galaxies, dubbed Triple Color Galaxies (TCGs), in the UKIDSS-UDS field. We show that these galaxies have a median 850 μm flux of S850 = 0.96 +/- 0.04 mJy (equivalent to a star formation rate SFR ~60–100 M yr−1 based on spectral energy distribution fitting), representing the first large sample of faint SMGs that bridges the gap between bright SMGs and normal star-forming galaxies in S850 and LIR. We assess the basic properties of TCGs and their relationship with other galaxy populations at z ~ 2. We measure the two-point autocorrelation function for this population and derive a typical halo mass of log10(Mhalo) = -12.9+0.2-0.3, 12.7+0.1,-0.2, and 12.9+0.2,-0,3 h-1 M at z = 1–2, 2–3, and 3–5, respectively. Together with the bright SMGs (S850 >/~ 2 mJy) and a comparison sample of less far-infrared luminous star-forming galaxies, we find a lack of dependence between spatial clustering and S850 (or SFR), suggesting that the difference between these populations may lie in their local galactic environment. Lastly, on the scale of ~8–17 kpc at 1 < z < 5 we find a tentative enhancement of the clustering of TCGs over the comparison star-forming galaxies, suggesting that some faint SMGs are physically associated pairs, perhaps reflecting a merging origin in their triggering. American Astronomical Society 2016-11-01 Article PeerReviewed Chen (陳建州), Chian-Chou, Smail, Ian, Swinbank, A.M., Simpson, James M., Almaini, Omar, Conselice, Christopher J., Hartley, Will G., Mortlock, Alice, Simpson, Chris and Wilkinson, Aaron (2016) Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses. Astrophysical Journal, 831 (1). p. 91. ISSN 1538-4357 cosmology: observations ; galaxies: evolution ; galaxies: formation ; galaxies: high-redshift ; largescale structure of universe ; submillimeter: galaxies http://iopscience.iop.org/article/10.3847/0004-637X/831/1/91/meta doi:10.3847/0004-637X/831/1/91 doi:10.3847/0004-637X/831/1/91 |
| spellingShingle | cosmology: observations ; galaxies: evolution ; galaxies: formation ; galaxies: high-redshift ; largescale structure of universe ; submillimeter: galaxies Chen (陳建州), Chian-Chou Smail, Ian Swinbank, A.M. Simpson, James M. Almaini, Omar Conselice, Christopher J. Hartley, Will G. Mortlock, Alice Simpson, Chris Wilkinson, Aaron Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses |
| title | Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses |
| title_full | Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses |
| title_fullStr | Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses |
| title_full_unstemmed | Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses |
| title_short | Faint submillimeter galaxies identified through their optical/near-infrared colors: 1. Spatial clustering and halo masses |
| title_sort | faint submillimeter galaxies identified through their optical/near-infrared colors: 1. spatial clustering and halo masses |
| topic | cosmology: observations ; galaxies: evolution ; galaxies: formation ; galaxies: high-redshift ; largescale structure of universe ; submillimeter: galaxies |
| url | https://eprints.nottingham.ac.uk/39817/ https://eprints.nottingham.ac.uk/39817/ https://eprints.nottingham.ac.uk/39817/ |