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Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-55356

Freeland, E; Tran, K V H; Irwin, T; Giordano, L; Saintonge, A; Gonzalez, A H; Zaritsky, D; Just, D (2011). Detection of outflowing and extraplanar gas in disks in an assembling galaxy cluster at z = 0.37. Astrophysical Journal Letters, 742(2):L34.

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We detect ionized gas characteristics indicative of winds in three disk-dominated galaxies that are members of a super-group at z = 0.37 that will merge to form a Coma-mass cluster. All three galaxies are IR luminous (L IR > 4 × 1010 L sun, SFR > 8 M sun yr-1) and lie outside the X-ray cores of the galaxy groups. We find that the most IR-luminous galaxy has strong blueshifted and redshifted emission lines with velocities of ~ ± 200 km s-1 and a third, blueshifted (~900 km s-1) component. This galaxy's line widths (Hβ, [O III]λ5007, [N II], Hα) correspond to velocities of 100-1000 km s-1. We detect extraplanar gas in two of the three galaxies with SFR >8 M sun yr-1 whose orientations are approximately edge-on and which have integral field unit (IFU) spaxels off the stellar disk. IFU maps reveal that the extraplanar gas extends to rh ~ 10 kpc [N II] and Hα line widths correspond to velocities of ~200-400 km s-1 in the disk and decrease to ~50-150 km s-1 above the disk. Multi-wavelength observations indicate that the emission is dominated by star formation. Including the most IR-luminous galaxy we find that 18% of supergroup members with SFR >8 M sun yr-1 show ionized gas characteristics indicative of outflows. This is a lower limit as showing that gas is outflowing in the remaining, moderately inclined, galaxies requires a non-trivial decoupling of contributions to the emission lines from rotational and turbulent motion. Ionized gas mass loss in these winds is ~0.1 M sun yr-1 for each galaxy, although the winds are likely to entrain significantly larger amounts of mass in neutral and molecular gases.


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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Date:December 2011
Deposited On:18 Feb 2012 13:05
Last Modified:05 Apr 2016 15:23
Publisher:Institute of Physics Publishing
ISSN:0004-637X (P) 1538-4357 (E)
Publisher DOI:10.1088/2041-8205/742/2/L34
Related URLs:http://arxiv.org/abs/1111.0289

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