Astrophys. J., 832, 175-175 (2016/December-1)
Exploring damped Lyα system host galaxies using gamma-ray bursts.
TOY V.L., CUCCHIARA A., VEILLEUX S., FUMAGALLI M., RAFELSKI M., RAHMATI A., CENKO S.B., CAPONE J.I. and PASHAM D.R.
Abstract (from CDS):
We present a sample of 45 Damped Lyα system (DLA; NHI\geqslant 2×1020 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∼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 H i 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∼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.
© 2016. The American Astronomical Society. All rights reserved.
galaxies: high-redshift - galaxies: ISM - galaxies: star formation - gamma-ray burst: general - ISM: atoms - ISM: atoms
View the reference in ADS
To bookmark this query, right click on this link: simbad:2016ApJ...832..175T and select 'bookmark this link' or equivalent in the popup menu