TY  - JOUR
A1  - Schroetter, I.
A1  - Bouche, Nicolas
A1  - Wendt, Martin
A1  - Contini, Thierry
A1  - Finley, H.
A1  - Pello, R.
A1  - Bacon, Roland
A1  - Cantalupo, Sebastiano
A1  - Marino, Raffaella Anna
A1  - Richard, J.
A1  - Lilly, S. J.
A1  - Schaye, Joop
A1  - Soto, K.
A1  - Steinmetz, Matthias
A1  - Straka, Lorrie A.
A1  - Wisotzki, Lutz
T1  - MUSE GAS FLOW AND WIND (MEGAFLOW). I. FIRST MUSE RESULTS ON BACKGROUND QUASARS
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - The physical properties of galactic winds are one of the keys to understand galaxy formation and evolution. These properties can be constrained thanks to background quasar lines of sight (LOS) passing near star-forming galaxies (SFGs). We present the first results of the MusE GAs FLOw and Wind survey obtained from two quasar fields, which have eight Mg II absorbers of which three have rest equivalent width greater than 0.8 angstrom. With the new Multi Unit Spectroscopic Explorer (MUSE) spectrograph on the Very Large Telescope (VLT), we detect six (75%) Mg II host galaxy candidates within a radius of 30. from the quasar LOS. Out of these six galaxy-quasar pairs, from geometrical argument, one is likely probing galactic outflows, where two are classified as "ambiguous,"two are likely probing extended gaseous disks and one pair seems to be a merger. We focus on the wind-pair and constrain the outflow using a high-resolution quasar spectra from the Ultraviolet and Visual Echelle Spectrograph. Assuming the metal absorption to be due to ga;s flowing out of the detected galaxy through a cone along the minor axis, we find outflow velocities in the order of approximate to 150 km s(-1) (i.e., smaller than the escape velocity) with a loading factor, eta = M-out/SFR, of approximate to 0.7. We see evidence for an open conical flow, with a low-density inner core. In the future, MUSE will provide us with about 80 multiple galaxy-quasar pairs in two dozen fields.
KW  - galaxies: evolution
KW  - galaxies: formation
KW  - intergalactic medium
KW  - quasars: individual (SDSS J213748+001220, SDSS J215200+062516)
Y1  - 2016
U6  - https://doi.org/10.3847/1538-4357/833/1/39
SN  - 0004-637X
SN  - 1538-4357
VL  - 833
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -