TY  - JOUR
A1  - Schroetter, Ilane
A1  - Bouche, Nicolas F.
A1  - Zabl, Johannes
A1  - Contini, Thierry
A1  - Wendt, Martin
A1  - Schaye, Joop
A1  - Mitchell, Peter
A1  - Muzahid, Sowgat
A1  - Marino, Raffaella Anna
A1  - Bacon, Roland
A1  - Lilly, Simon J.
A1  - Richard, Johan
A1  - Wisotzki, Lutz
T1  - MusE GAs FLOw andWind (MEGAFLOW)
T2  - Monthly notices of the Royal Astronomical Society
N2  - We present results from our on-going MusE GAs FLOw and Wind (MEGAFLOW) survey, which consists of 22 quasar lines of sight, each observed with the integral field unit MUSE and the UVES spectrograph at the ESO Very Large Telescopes (VLT). The goals of this survey are to study the properties of the circumgalactic medium around z similar to 1 star-forming galaxies. The absorption-line selected survey consists of 79 strong MgII absorbers (with rest-frame equivalent width greater than or similar to 0.3 angstrom) and, currently, 86 associated galaxies within 100 projected kpc of the quasar with stellar masses (M-star) from 109 to 1011 M-circle dot. We find that the cool halo gas traced by MgII is not isotropically distributed around these galaxies from the strong bi-modal distribution in the azimuthal angle of the apparent location of the quasar with respect to the galaxy major axis. This supports a scenario in which outflows are bi-conical in nature and co-exist with a co-planar gaseous structure extending at least up to 60-80 kpc. Assuming that absorbers near the minor axis probe outflows, the current MEGAFLOW sample allowed us to select 26 galaxy-quasar pairs suitable for studying winds. From this sample, using a simple geometrical model, we find that the outflow velocity only exceeds the escape velocity when M-star less than or similar to 4 x 10(9) M-circle dot, implying the cool material is likely to fall back except in the smallest haloes. Finally, we find that the mass loading factor., the ratio between the ejected mass rate and the star formation rate, appears to be roughly constant with respect to the galaxy mass.
KW  - galaxies: evolution
KW  - galaxies: formation
KW  - intergalactic medium
KW  - quasars: absorption lines
Y1  - 2019
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/47737
SN  - 0035-8711
SN  - 1365-2966
VL  - 490
IS  - 3
SP  - 4368
EP  - 4381
PB  - Oxford Univ. Press
CY  - Oxford
ER  -