Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-22
Astronomy and Astrophysics
Astrophysics
34 pages, 12 .ps figures, 10 tables; accepted for publication in ApJ, 10 May 2002, v570 n2
Scientific paper
10.1086/339789
In this paper, we present moderately-high resolution (~65 km/s) spectroscopy, acquired with ESI on Keck II, of 11 ultraluminous infrared galaxies at z < 0.3 from the IRAS 1 Jy sample. The targets were chosen as good candidates to host galaxy-scale outflows, and most have infrared luminosities dominated by star formation. We use a chi-squared minimization to fit one- to three-component profiles to the NaI D interstellar absorption doublet in each object. Assuming that gas blueshifted by more than 70 km/s relative to the systemic velocity of the host is outflowing, we detect outflows in 73% of these objects. We adopt a simple model of a mass-conserving free wind to infer mass outflow rates in the range (dM/dt)_tot(H) = 13-133 M_sun/yr for galaxies hosting a wind. These values of (dM/dt)_tot, normalized to the corresponding global star formation rates inferred from infrared luminosities, are in the range eta = (dM/dt)_tot / SFR = 0.1-0.7. This is on average a factor of only 10 less than eta from recent measurements of nearby dwarfs, edge-on spirals, and lower-luminosity infrared galaxies. Within our sample, we conclude that eta has no dependence on the mass of the host (parameterized by host galaxy kinematics and absolute R- and K'-band magnitudes). We also attempt to estimate the average escape fraction
Rupke David S.
Sanders David B.
Veilleux Sylvain
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