Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734505m&link_type=abstract
American Astronomical Society, AAS Meeting #217, #345.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We compare the kinematics and absorption properties of a sample of 30 strong MgII absorbers at z<1 to their host galaxy impact parameters and luminosities. The MgII absorption properties are derived from high resolution quasar spectra from the HIRES/Keck and UVES/VLT public archives. The host galaxy properties come from the larger imaging survey of Rao et al. (2010), which has the aim of relating DLA, sub-DLA, and LLS properties to the properties of the host galaxies. That survey yields the result that absorbers with larger neutral hydrogen column densities (i.e. damped Lyman-alpha absorbers) tend to be located at smaller impact parameter than those with smaller neutral hydrogen column densities (i.e. sub-DLA and Lyman limit absorbers). We quantify the MgII absorption properties with: 1) kinematic spread (the optical depth weighted second velocity moment) of the 2796A profile; 2) total velocity spread of the 2796A profile; 3) the absorbed pixel fraction (fraction of pixels over the full velocity range that have detected absorption features). We find that there is significant scatter in the relationships between the MgII absorption properties and the impact parameter and luminosity of the absorbing galaxy. However, we do find that absorbers with small impact parameters tend to have larger absorbed pixel fractions than those at large impact parameters. We interpret these results based upon the interplay of the various processes responsible for MgII absorption and its kinematics. The lack of strong correlations could be due to contributions to the absorption kinematics from the complex mix of superwinds, high velocity clouds, dwarf galaxy satellites, and to the stochastic nature of galaxy disks.
Charlton Jane
Mathes Nigel
Nestor Daniel
Rao Sumathi
Rodriguez-Hidalgo Paola
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