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High-velocity outflows from young star-forming galaxies in the UKIDSS Ultra-Deep Survey
High-velocity outflows from young star-forming galaxies in the UKIDSS Ultra-Deep Survey
- Source :
- Monthly Notices of the Royal Astronomical Society
- Publication Year :
- 2013
-
Abstract
- We investigate galactic-scale outflows in the redshift range 0.71 < z < 1.63, using 413 K-band selected galaxies observed in the spectroscopic follow-up of the UKIDSS Ultra-Deep Survey (UDSz). The galaxies have an average stellar mass of ~10^9.5 solar masses and span a wide range in rest-frame colours, representing typical star-forming galaxies at this epoch. We stack the spectra by various galaxy properties, including stellar mass, [OII] equivalent width, star-formation rate, specific star-formation rate and rest-frame spectral indices. We find that outflows are present in virtually all spectral stacks, with velocities ranging from 100-1000 km s^-1, indicating that large-scale outflowing winds are a common property at these redshifts. The highest velocity outflows (>500 km s^-1) are found in galaxies with the highest stellar masses and the youngest stellar populations. Our findings suggest that high velocity galactic outflows are mostly driven by star-forming processes rather than AGN, with implied mass outflow rates comparable to the rates of star formation. Such behaviour is consistent with models required to reproduce the high-redshift mass-metallicity relation.<br />16 pages, 15 figures, accepted by MNRAS
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
High velocity
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Disc galaxy
01 natural sciences
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
Disc
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Physics
Luminous infrared galaxy
010308 nuclear & particles physics
Star formation
Astronomy
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
Redshift
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Outflow
Astrophysics::Earth and Planetary Astrophysics
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00358711
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....aff7681223cb9e083f438053aea5a627
- Full Text :
- https://doi.org/10.1093/mnras/stt715