NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T04:05:43 PDT
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For refcode 2015ApJ...811..149C:
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2015ApJ...811..149C Scaling Relations Between Warm Galactic Outflows and Their Host Galaxies Chisholm, John; Tremonti, Christy A.; Leitherer, Claus; Chen, Yanmei; Wofford, Aida; Lundgren, Britt Abstract. We report on a sample of 48 nearby, star-forming galaxies observed with the Cosmic Origin Spectrograph on the Hubble Space Telescope. We measure the kinematics of warm gas in galactic outflows using a combination of four Si II absorption lines. We use multi-wavelength ancillary data to estimate stellar masses (M_*_), star formation rates (SFR), circular velocities (v_circ_), and morphologies. The galaxies cover four orders of magnitude in M_*_ and SFR, and sample a wide range of morphologies from starbursting mergers to normal star-forming galaxies. We derive 3.0-3.5sigma relations between outflow velocity and SFR, M_*_, and v_circ_. The outflow velocities scale as SFR^0.08-0.22^, {M}_*_^0.12-0.20^ and {v}_{circ_}^0.44-0.87^, with the range depending on whether we use a maximum or a central velocity to quantify the outflow velocity. After accounting for their increased SFR, mergers drive 32% faster outflows than non-merging galaxies, with all of the highest velocity outflows arising from mergers. Low-mass galaxies (log(M_*_/ M_sun_) < 10.5) lose some low-ionization gas through galactic outflows, while more massive galaxies retain all of their low-ionization gas, unless they undergo a merger. Key words: galaxies: evolution, galaxies: formation, galaxies: starburst
Retrieve 47 NED objects in this reference.
Please click here for ADS abstract

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