期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 433, 期 1, 页码 194-208出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt715
关键词
galaxies: active; galaxies: evolution; quasars: general
资金
- European Research Council
- Royal Society through a Wolfson Research Merit Award
- Science and Technology Facilities Council [ST/J001422/1, ST/J001465/1, ST/F007043/1, ST/I001212/1] Funding Source: researchfish
- STFC [ST/J001465/1, ST/I001212/1, ST/F007043/1, ST/J001422/1] Funding Source: UKRI
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 similar to 10(9.5) M-circle dot 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, [O ii] 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 to 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 active galactic nuclei, 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.
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