期刊
ASTROPHYSICAL JOURNAL
卷 809, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/809/2/147
关键词
galaxies: evolution; galaxies: ISM; galaxies: kinematics and dynamics; galaxies: starburst; intergalactic medium
资金
- Kavli Institute for Theoretical Physics
- Simons Foundation
- Aspen Center for Physics
- NASA [NAS5-26555]
- National Science Foundation [PHYS-1066293]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- [HST GO 12603]
Using ultraviolet absorption lines, we analyze the systematic properties of the warm ionized phase of starburst-driven winds in a sample of 39 low-redshift objects that spans broad ranges in starburst and galaxy properties. Total column densities for the outflows are similar to 10(21) cm(-2). The outflow velocity (nu(out)) correlates only weakly with the galaxy stellar mass (M-*), or circular velocity (nu(cir)), but strongly with both SFR and SFR/area. The normalized outflow velocity (nu(out)/nu(cir)) correlates well with both SFR/area and SFR/M-*. The estimated outflow rates of warm ionized gas (M) over dot are similar to 1-4 times the SFR, and the ratio (M) over dot/SFR does not correlate with nu(out). We show that a model of a population of clouds accelerated by the combined forces of gravity and the momentum flux from the starburst matches the data. We find a threshold value for the ratio of the momentum flux supplied by the starburst to the critical momentum flux needed for the wind to overcome gravity acting on the clouds (R-crit). For R-crit > 10 (strong-outflows) the outflow's momentum flux is similar to the total momentum flux from the starburst and the outflow velocity exceeds the galaxy escape velocity. Neither of these is the case for the weak outflows (R-crit < 10). For the weak-outflows, the data severely disagree with many prescriptions in numerical simulations or semi-analytic models of galaxy evolution. The agreement is better for the strong outflows, and we advocate the use of R-crit to guide future prescriptions.
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