Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.5702b&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #57.02; Bulletin of the American Astronomical Society, Vol. 33, p.869
Astronomy and Astrophysics
Astronomy
Scientific paper
We present high-resolution profiles of four extremely strong (Wr > 1.8 Å) Mg II absorbers at 1 < z < 2. The profiles display a common kinematic structure, having a sharp drop in optical depth near the center of the profile and strong absorption on either side. This symmetric double-structure, with a velocity spread of several hundred km/s, is suggestive of superwinds arising in actively star-forming galaxies. Low-ionization absorption of similar strength has been observed in local star-forming galaxies (e.g. Heckman et al. 2000). Norman et al. (1996) see absorption out to ~ 20 kpc. Mg II absorbers with Wr > 1 Å evolve away from z = 2 to the present. We propose that a large fraction of these absorbers are due to superwinds and that their evolution is related to the evolution of star-forming galaxies over that redshift interval. Based on the observed number density of Wr > 1.8 Å Mg II absorbers per unit redshift (Steidel and Sargent 1992), we explore whether it is realistic that superwinds in the star-forming population at 1 < z < 2 could give rise to these absorbers.
Bond Nicholas A.
Charlton Jane C.
Churchill Christopher W.
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