期刊
ASTROPHYSICAL JOURNAL
卷 832, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/0004-637X/832/2/175
关键词
galaxies: high-redshift; galaxies: ISM; galaxies: star formation; gamma-ray burst: general; ISM: atoms
资金
- Discovery Communications
- National Science Foundation [AST-1005313]
- National Aeronautics and Space Administration (NASA) Headquarters under NASA Earth and Space Science Fellowship Program [NNX12AL70H]
- NSF/ATI [1207785]
- NASA grant Multiband Observations of the Most Relativistic Gamma-Ray Bursts [NNX15AP23G]
- NASA Postdoctoral Program
- Science and Technology Facilities Council [ST/L00075X/1]
- NASA [799361, NNX15AP23G] Funding Source: Federal RePORTER
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1207785] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/I001573/1, ST/L00075X/1] Funding Source: researchfish
- STFC [ST/I001573/1, ST/L00075X/1] Funding Source: UKRI
We present a sample of 45 Damped Ly alpha system (DLA; N-HI >= 2 x 10(20) cm(-2)) counterparts (33 detections, 12 upper limits) which host gamma-ray bursts (GRB-DLAs) in order to investigate star formation and metallicity within galaxies hosting DLAs. Our sample spans z similar to 2-6 and is nearly three times larger than any previously detected DLA counterparts survey based on quasar line-of-sight searches (QSO-DLAs). We report star formation rates (SFRs) from rest-frame UV photometry and spectral energy distribution modeling. We find that DLA counterpart SFRs are not correlated with either redshift or HI column density. Thanks to the combination of Hubble Space Telescope and ground-based observations, we also investigate DLA host star formation efficiency. Our GRB-DLA counterpart sample spans both higher efficiency and low efficiency star formation regions compared to the local Kennicutt-Schmidt relation, local star formation laws, and z similar to 3 cosmological simulations. We also compare the depletion times of our DLA hosts sample to other objects in the local universe; our sample appears to deviate from the star formation efficiencies measured in local spiral and dwarf galaxies. Furthermore, we find similar efficiencies as local inner disks, SMC, and Lyman-break galaxy outskirts. Finally, our enrichment time measurements show a spread of systems with under-and over-abundance of metals, which may suggest that these systems had episodic star formation and a metal enrichment/depletion as a result of strong stellar feedback and/or metal inflow/outflow.
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