Details

Autor(en) / Beteiligte

• Bradshaw, E. J.
• Almaini, O.
• Hartley, W. G.
• Smith, K. T.
• Conselice, C. J.
• Dunlop, J. S.
• Simpson, C.
• Chuter, R. W.
• Cirasuolo, M.
• Foucaud, S.
• McLure, R. J.
• Mortlock, A.
• Pearce, H.

Titel

High-velocity outflows from young star-forming galaxies in the UKIDSS Ultra-Deep Survey

Ist Teil von

• Monthly notices of the Royal Astronomical Society, 2013-07, Vol.433 (1), p.194-208

Ort / Verlag

London: Oxford University Press

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 ∼109.5 M 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.