Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..304g&link_type=abstract
NOAO Proposal ID #2008B-0304
Physics
Scientific paper
The Mg II (lambda)(lambda) 2796, 2803 doublets are among the absorption features commonly seen in the spectra of distant quasars. These absorbers arise primarily in photo-ionized halo gas around foreground galaxies. We propose to use MagE on the Magellan Clay telescope to observe 40 QSOs that are within ~ 100 h^-1 kpc projected distances of a foreground galaxy spectroscopically identified in the 2dF Galaxy Redshift Survey. MagE is a new echellette spectrograph that offers exceptional throughput over (Delta) (lambda)=3,050-10,000Awith a spectral resolution of (delta) v~ 40 km/s. It allows observations of Mg II absorbers associated with galaxies at z≈g 0.1. The primary objectives of the proposed observations are (1) to constrain the covering fraction of cool gas around low-redshift galaxies at z=0.1-0.35 for which there is no covering fraction data currently available; and (2) to examine the correlation between Mg II absorption properties and known galaxy properties such as luminosity, impact distance, and stellar population. The results will be combined with available Mg II measurements near galaxies at z~ 0.4-1 for establishing an empirical characterization of the evolution of cool baryons in dark matter halos.
Chen Hsiao-Wen
Gauthier Jean-Rene
Tinker Jeremy L.
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