Johannes Zabl, Nicolas F. Bouche, Ilane Schroetter, Martin Wendt, Hayley Finley, Joop Schaye, Simon Conseil, Thierry Contini, Raffaella Anna Marino, Peter Mitchell, Sowgat Muzahid, Gabriele Pezzulli, Lutz Wisotzki
- We use the MusE GAs FLOw and Wind (MEGAFLOW) survey to study the kinematics of extended disc-like structures of cold gas around z approximate to 1 star-forming galaxies. The combination of VLT/MUSE and VLT/UVES observations allows us to connect the kinematics of the gas measured through MgII quasar absorption spectroscopy to the kinematics and orientation of the associated galaxies constrained through integral field spectroscopy. Confirming previous results, we find that the galaxy-absorber pairs of the MEGAFLOW survey follow a strong bimodal distribution, consistent with a picture of MgII absorption being predominantly present in outflow cones and extended disc-like structures. This allows us to select a bona-fide sample of galaxy-absorber pairs probing these discs for impact paramometers of 10-70 kpc. We test the hypothesis that the disc-like gas is co-rotating with the galaxy discs, and find that for seven out of nine pairs the absorption velocity shares the sign of the disc velocity, disfavouring random orbits. We further showWe use the MusE GAs FLOw and Wind (MEGAFLOW) survey to study the kinematics of extended disc-like structures of cold gas around z approximate to 1 star-forming galaxies. The combination of VLT/MUSE and VLT/UVES observations allows us to connect the kinematics of the gas measured through MgII quasar absorption spectroscopy to the kinematics and orientation of the associated galaxies constrained through integral field spectroscopy. Confirming previous results, we find that the galaxy-absorber pairs of the MEGAFLOW survey follow a strong bimodal distribution, consistent with a picture of MgII absorption being predominantly present in outflow cones and extended disc-like structures. This allows us to select a bona-fide sample of galaxy-absorber pairs probing these discs for impact paramometers of 10-70 kpc. We test the hypothesis that the disc-like gas is co-rotating with the galaxy discs, and find that for seven out of nine pairs the absorption velocity shares the sign of the disc velocity, disfavouring random orbits. We further show that the data are roughly consistent with inflow velocities and angular momenta predicted by simulations, and that the corresponding mass accretion rates are sufficient to balance the star formation rates.…
MetadatenAuthor details: | Johannes ZablORCiD, Nicolas F. Bouche, Ilane Schroetter, Martin WendtORCiDGND, Hayley Finley, Joop SchayeORCiD, Simon Conseil, Thierry Contini, Raffaella Anna MarinoORCiD, Peter Mitchell, Sowgat MuzahidORCiD, Gabriele PezzulliORCiD, Lutz WisotzkiORCiDGND |
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DOI: | https://doi.org/10.1093/mnras/stz392 |
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ISSN: | 0035-8711 |
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ISSN: | 1365-2966 |
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Title of parent work (English): | Monthly notices of the Royal Astronomical Society |
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Subtitle (English): | II. A study of gas accretion around z approximate to 1 star-forming galaxies with background quasars |
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Publisher: | Oxford Univ. Press |
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Place of publishing: | Oxford |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2019/02/08 |
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Publication year: | 2019 |
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Release date: | 2021/02/16 |
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Tag: | galaxies: evolution; galaxies: formation; galaxies: haloes; galaxies: kinematics and dynamics; quasars: absorption lines |
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Volume: | 485 |
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Issue: | 2 |
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Number of pages: | 20 |
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First page: | 1961 |
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Last Page: | 1980 |
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Funding institution: | Agence Nationale de la Recherche (ANR) grant FOGHARFrench National Research Agency (ANR) [ANR-13-BS05-0010]; ANR grant 3DGasFlowsFrench National Research Agency (ANR) [ANR-17-CE31-0017]; OCEVULabex government program [ANR-11-IDEX-0001-02]; Competitive Fund of the Leibniz Association [SAW-2015-AIP-2]; European Southern Observatory under ESO programmes [094.A-0211(B), 095.A-0365(A), 096.A-0609(A), 096.A-0164(A), 097.A-0138(A), 097.A-0144(A), 098.A-0216(A), 098.A-0310(A), 099.A-0059(A), 293.A-5038(A)] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access / Green Open-Access |
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