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http://hdl.handle.net/2289/7011
Title: | Probing Star Formation in Galaxies at z ≈ 1 via a Giant Metrewave Radio Telescope Stacking Analysis |
Authors: | Apurba, Bera Nissim, Kanekar Benjamin, Weiner J Sethi, S.K. Dwarakanath, K.S. |
Keywords: | galaxies: high-redshift galaxies: star formation radio continuum galaxies |
Issue Date: | 20-Sep-2018 |
Publisher: | IOP Sciences for The American Astronomical Society |
Citation: | Astrophysical Journal, 2018, Vol. 865, p39 |
Abstract: | We report deep Giant Metrewave Radio Telescope (GMRT) 610 MHz continuum imaging of four subfields of the DEEP2 Galaxy Redshift Survey. We stacked the radio emission in the GMRT images from a near-complete (absolute blue magnitude M B ≤ −21) sample of 3698 blue star-forming galaxies with redshifts 0.7 lesssim z lesssim 1.45 to detect (at ≈17σ significance) the median rest-frame 1.4 GHz radio continuum emission of the sample galaxies. The stacked emission is unresolved, with a rest-frame 1.4 GHz luminosity of L 1.4GHz = (4.13 ± 0.24) × 1022 W Hz−1. We used the local relation between total star formation rate (SFR) and 1.4 GHz luminosity to infer a median total SFR of (24.4 ± 1.4) M ⊙ yr−1 for blue star-forming galaxies with M B ≤ −21 at 0.7 lesssim z lesssim 1.45. We detect the main-sequence relation between SFR and stellar mass, M sstarf, obtaining SFR = (13.4 ± 1.8) × [(M sstarf/1010 M ⊙)]0.73±0.09 M ⊙ yr−1; the power-law index shows no change over z ≈ 0.7–1.45. We find that the nebular line emission suffers less extinction than the stellar continuum, contrary to the situation in the local universe; the ratio of nebular extinction to stellar extinction increases with decreasing redshift. We obtain an upper limit of 0.87 Gyr to the atomic gas depletion time of a subsample of DEEP2 galaxies at z ≈ 1.3; neutral atomic gas thus appears to be a transient phase in high-z star-forming galaxies |
Description: | Open Access |
URI: | http://hdl.handle.net/2289/7011 |
ISSN: | 0004-637X 1538-4357-(Online) |
Alternative Location: | https://doi.org/10.3847/1538-4357/aad698 |
Copyright: | 2018. The American Astronomical Society |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2018_ApJ_Vol.865_p39.pdf | Open Access | 1.09 MB | Adobe PDF | View/Open |
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