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Title:
Ubiquitous Outflows in DEEP2 Spectra of Star-Forming Galaxies at z = 1.4
Authors:
Weiner, Benjamin J.; Coil, Alison L.; Prochaska, Jason X.; Newman, Jeffrey A.; Cooper, Michael C.; Bundy, Kevin; Conselice, Christopher J.; Dutton, Aaron A.; Faber, S. M.; Koo, David C.; Lotz, Jennifer M.; Rieke, G. H.; Rubin, K. H. R.
Affiliation:
AA(Steward Observatory, 933 N. Cherry St., University of Arizona, Tucson, AZ 85721, USA ), AB(Steward Observatory, 933 N. Cherry St., University of Arizona, Tucson, AZ 85721, USA ; Department of Physics and CASS, University of California, San Diego, La Jolla, CA 92093-0424, USA ; Hubble Fellow. ), AC(UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064, USA ), AD(Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA ), AE(Steward Observatory, 933 N. Cherry St., University of Arizona, Tucson, AZ 85721, USA ; Spitzer Fellow. ), AF(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada ), AG(School of Physics and Astronomy, University of Nottingham, Nottingham, UK ), AH(UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064, USA ), AI(UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064, USA ), AJ(UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064, USA ), AK(National Optical Astronomy Observatories, Tucson, AZ 85719, USA ; Leo Goldberg Fellow.), AL(Steward Observatory, 933 N. Cherry St., University of Arizona, Tucson, AZ 85721, USA ), AM(UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064, USA )
Publication:
The Astrophysical Journal, Volume 692, Issue 1, pp. 187-211 (2009). (ApJ Homepage)
Publication Date:
02/2009
Origin:
IOP
ApJ Keywords:
galaxies: evolution, galaxies: high-redshift, intergalactic medium, ultraviolet: ISM
DOI:
10.1088/0004-637X/692/1/187
Bibliographic Code:
2009ApJ...692..187W

Abstract

Galactic winds are a prime suspect for the metal enrichment of the intergalactic medium (IGM) and may have a strong influence on the chemical evolution of galaxies and the nature of QSO absorption-line systems. We use a sample of 1406 galaxy spectra at z ~ 1.4 from the DEEP2 redshift survey to show that blueshifted Mg IYI λλ 2796, 2803 absorption is ubiquitous in star-forming galaxies at this epoch. This is the first detection of frequent outflowing galactic winds at z ~ 1. The presence and depth of absorption are independent of active galactic nuclei spectral signatures or galaxy morphology; major mergers are not a prerequisite for driving a galactic wind from massive galaxies. Outflows are found in co-added spectra of galaxies spanning a range of 30 times in stellar mass and 10 times in star formation rate (SFR), calibrated from K-band and from the Multiband Imaging Photometer for Spitzer IR fluxes. The outflows have column densities of order NH ~ 1020 cm-2 and characteristic velocities of ~ 300-500 km s-1, with absorption seen out to 1000 km s-1 in the most massive, highest SFR galaxies. The velocities suggest that the outflowing gas can escape into the IGM and that massive galaxies can produce cosmologically and chemically significant outflows. Both the Mg II equivalent width and the outflow velocity are larger for galaxies of higher stellar mass and SFR, with V wind ~ SFR0.3, similar to the scaling in low redshift IR-luminous galaxies. The high frequency of outflows in the star-forming galaxy population at z ~ 1 indicates that galactic winds occur in the progenitors of massive spirals as well as those of ellipticals. The increase of outflow velocity with mass and SFR constrains theoretical models of galaxy evolution that include feedback from galactic winds, and may favor momentum-driven models for the wind physics.
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