Skip to Main content Skip to Navigation
Journal articles

Scaling Relations Between Warm Galactic Outflows and Their Host Galaxies

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 (vcirc), 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 3.0-3.5σ relations between outflow velocity and SFR, M*, and vcirc. The outflow velocities scale as SFR0.08-0.22, {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) < 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.
Document type :
Journal articles
Complete list of metadata
Contributor : Hal Sorbonne Université Gestionnaire Connect in order to contact the contributor
Submitted on : Tuesday, April 19, 2022 - 1:57:35 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:05 AM

Links full text



John Chisholm, Christy A. Tremonti, Claus Leitherer, Yanmei Chen, Aida Wofford, et al.. Scaling Relations Between Warm Galactic Outflows and Their Host Galaxies. The Astrophysical Journal, 2015, 811, ⟨10.1088/0004-637X/811/2/149⟩. ⟨insu-03644725⟩



Record views