Nicolas Bouche, H. Finley, I. Schroetter, M. T. Murphy, Philipp Richter, Roland Bacon, Thierry Contini, J. Richard, Martin Wendt, S. Kamann, Benoit Epinat, Sebastiano Cantalupo, Lorrie A. Straka, Joop Schaye, C. L. Martin, C. Peroux, Lutz Wisotzki, K. Soto, S. Lilly, C. M. Carollo, Jarle Brinchmann, W. Kollatschny
- We use a background quasar to detect the presence of circumgalactic gas around a z = 0.91 low-mass star-forming galaxy. Data from the new Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope show that the galaxy has a dust-corrected star formation rate (SFR) of 4.7 +/- 2.0. M-circle dot yr(-1), with no companion down to 0.22 M-circle dot yr(-1) (5 sigma) within 240 h(-1) kpc ("30"). Using a high-resolution spectrum of the background quasar, which is fortuitously aligned with the galaxy major axis (with an azimuth angle alpha of only 15 degrees), we find, in the gas kinematics traced by low-ionization lines, distinct signatures consistent with those expected for a "cold-flow disk" extending at least 12 kpc (3 x R-1/2). We estimate the mass accretion rate M-in to be at least two to three times larger than the SFR, using the geometric constraints from the IFU data and the H (I) column density of log N-H (I)/cm(-2) similar or equal to 20.4 obtained from a Hubble Space Telescope/COS near-UV spectrum. From a detailedWe use a background quasar to detect the presence of circumgalactic gas around a z = 0.91 low-mass star-forming galaxy. Data from the new Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope show that the galaxy has a dust-corrected star formation rate (SFR) of 4.7 +/- 2.0. M-circle dot yr(-1), with no companion down to 0.22 M-circle dot yr(-1) (5 sigma) within 240 h(-1) kpc ("30"). Using a high-resolution spectrum of the background quasar, which is fortuitously aligned with the galaxy major axis (with an azimuth angle alpha of only 15 degrees), we find, in the gas kinematics traced by low-ionization lines, distinct signatures consistent with those expected for a "cold-flow disk" extending at least 12 kpc (3 x R-1/2). We estimate the mass accretion rate M-in to be at least two to three times larger than the SFR, using the geometric constraints from the IFU data and the H (I) column density of log N-H (I)/cm(-2) similar or equal to 20.4 obtained from a Hubble Space Telescope/COS near-UV spectrum. From a detailed analysis of the low-ionization lines (e.g., Zn II, Cr II, Ti II, MnII, Si II), the accreting material appears to be enriched to about 0.4 Z(circle dot) (albeit with large uncertainties: log Z/Z(circle dot) = -0.4 +/- 0.4), which is comparable to the galaxy metallicity (12 + log O/H = 8.7 +/- 0.2), implying a large recycling fraction from past outflows. Blueshifted Mg II and Fe II absorptions in the galaxy spectrum from the MUSE data reveal the presence of an outflow. The Mg II and Fe II absorption line ratios indicate emission infilling due to scattering processes, but the MUSE data do not show any signs of fluorescent Fe II* emission.…
MetadatenAuthor details: | Nicolas Bouche, H. Finley, I. Schroetter, M. T. Murphy, Philipp RichterORCiDGND, Roland Bacon, Thierry Contini, J. Richard, Martin WendtORCiDGND, S. Kamann, Benoit Epinat, Sebastiano CantalupoORCiD, Lorrie A. Straka, Joop SchayeORCiD, C. L. Martin, C. Peroux, Lutz WisotzkiORCiDGND, K. Soto, S. Lilly, C. M. Carollo, Jarle BrinchmannORCiD, W. Kollatschny |
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DOI: | https://doi.org/10.3847/0004-637X/820/2/121 |
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ISSN: | 0004-637X |
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ISSN: | 1538-4357 |
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Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics |
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Publisher: | IOP Publ. Ltd. |
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Place of publishing: | Bristol |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2016 |
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Publication year: | 2016 |
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Release date: | 2020/03/22 |
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Tag: | galaxies: evolution; galaxies: formation; intergalactic medium; quasars: individual (SDSS J142253.31-000149) |
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Volume: | 820 |
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Number of pages: | 17 |
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First page: | 1872 |
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Last Page: | 1882 |
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Funding institution: | Career Integration Grant (CIG) within the 7th European Community Framework Program [PCIG11-GA-2012-321702]; Australian Research Council for Discovery Project [DP130100568]; European Research Council (ERC) [278594]; ERC starting grant CALENDS; "Programme National de Cosmologie and Galaxies" (PNCG) of CNRS/INSU, France; NASA through a grant from the Space Telescope Science Institute [12522]; NASA [NAS 5-26555]; ANR FOGHAR [ANR-13-BS05-0010-02]; OCEVU Labex [ANR-11-LABX-0060]; A*MIDEX [ANR-11-IDEX-0001-02] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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Peer review: | Referiert |
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