MOSEL: Strong [OIII] 5007Å Emitting Galaxies at (3<z<4) from the ZFOURGE Survey
Article
Tran, Kim-Vy H., Forrest, Ben, Alcorn, Leo Y., Yuan, Tiantian, Nanayakkara, Themiya, Cohn, Jonathan, Cowley, Michael, Glazebrook, Karl, Gupta, Anshu, Kacprzak, Glenn G., Kewley, Lisa, Labbé, Ivo, Papovich, Casey, Spitler, Lee, Straatman, Caroline M. S. and Tomczak, Adam. 2020. "MOSEL: Strong [OIII] 5007Å Emitting Galaxies at (3<z<4) from the ZFOURGE Survey." The Astrophysical Journal: an international review of astronomy and astronomical physics. 898 (1), pp. 1-13. https://doi.org/10.3847/1538-4357/ab8cba
| Article Title | MOSEL: Strong [OIII] 5007Å Emitting Galaxies at (3<z<4) from the ZFOURGE Survey |
|---|---|
| ERA Journal ID | 1057 |
| Article Category | Article |
| Authors | Tran, Kim-Vy H., Forrest, Ben, Alcorn, Leo Y., Yuan, Tiantian, Nanayakkara, Themiya, Cohn, Jonathan, Cowley, Michael, Glazebrook, Karl, Gupta, Anshu, Kacprzak, Glenn G., Kewley, Lisa, Labbé, Ivo, Papovich, Casey, Spitler, Lee, Straatman, Caroline M. S. and Tomczak, Adam |
| Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
| Journal Citation | 898 (1), pp. 1-13 |
| Article Number | 45 |
| Number of Pages | 13 |
| Year | 2020 |
| Publisher | IOP Publishing |
| Place of Publication | United States |
| ISSN | 0004-637X |
| 1538-4357 | |
| Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-4357/ab8cba |
| Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-4357/ab8cba |
| Abstract | To understand how strong emission-line galaxies (SELGs) contribute to the overall growth of galaxies and star formation history of the universe, we target SELGs from the ZFOURGE imaging survey that have blended Hβ+[O iii] rest-frame equivalent widths of >230 A and 2.5 < z < 4.0. Using Keck/MOSFIRE, we measure 49 redshifts for galaxies brighter than K s = 25 mag as part of our Multi-Object Spectroscopic Emission Line (MOSEL) survey. Our spectroscopic success rate is ∼53% and z uncertainty is σ z = [Δz/(1+z)] = 0.0135. We confirm 31 ELGs at 3< z < 3.8, and show that SELGs have spectroscopic rest-frame [O iii]5007 A equivalent widths of 100-500 A and tend to be lower-mass systems [ ∼ 8.2-9.6] compared with more typical star-forming galaxies. The SELGs lie ∼0.9 dex above the star-forming main sequence at z ∼ 3.5 and have high inferred gas fractions of f ⪆ 60%, i.e., the inferred gas masses can easily fuel a starburst to double stellar masses within ∼10-100 Myr. Combined with recent results using ZFOURGE, our analysis indicates that (1) strong [O iii]5007 A emission signals an early episode of intense stellar growth in low-mass [M< 0.1,M] galaxies and (2) many, if not most, galaxies at z > 3 go through this starburst phase. If true, low-mass galaxies with strong [O III]5007 A emission (EWrest > 200 A) may be an increasingly important source of ionizing UV radiation at z > 3. |
| Keywords | Emission line galaxies (459); Galaxy evolution (594); Galaxy formation (595); Starburst galaxies (1570); Galaxy properties (615); Near infrared astronomy (1093) |
| Funder | Directorate for Mathematical and Physical Sciences |
| Byline Affiliations | University of New South Wales |
| Texas A&M University, United States | |
| ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
| University of California, United States | |
| Swinburne University of Technology | |
| Leiden University, Netherlands | |
| Centre for Astrophysics | |
| Queensland University of Technology | |
| Australian National University | |
| Macquarie University | |
| University of Gent, Belgium |
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