Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546008r&link_type=abstract
American Astronomical Society, AAS Meeting #215, #460.08; Bulletin of the American Astronomical Society, Vol. 42, p.490
Astronomy and Astrophysics
Astrophysics
Scientific paper
A fundamental astrophysical question is the role of gas in galaxy evolution. Mg II absorption as observed in quasar spectra is found to arise in a broad range of gaseous galactic environments. But the overall relationship between the distribution of Mg II absorbers, their host galaxies, and the larger scale galactic structure is not well known. Lyman-alpha studies have been successful in showing how galaxies and galaxy over densities correlate to neutral hydrogen absorption; therein providing insights into the absorbing gas-galaxy correlation function. However such studies have not been preformed using a tracer of low ionization metal enriched material that has been processed through galaxies. We present our study, in progress, to examine the relationship between Mg II absorbing gas and galaxies in 25 sight lines.
Our data include 1) HIRES/Keck and UVES/VLT quasar spectra, 2) HST WFPC-2/ACIS images, and 3) five SDSS u'r'i'g'z' band images from Apache Point Observatory. We measure the Mg II absorption, kinematics, and stringent limits of Mg II absorption as a function of redshift for each sight line. From the HST images we measure morphologies of all intervening galaxies in the quasar fields to a magnitude limit mF702W=24. From the APO images we measure the luminosities and photometric redshifts of all galaxies to mr=24 out to a projected separation of 500kpc from the quasar. We also include control fields for which no Mg II absorption is observed along the line of sight.
Our goals are to analyze how impact parameter, galaxy morphology and Mg II absorption kinematics are related, to constrain the gas distribution within an impact parameter of 500 kpc, and to study whether absorbing and non-absorbing galaxies differ in morphology. We also aim to quantitatively compare the Mg II-galaxy correlation, Lyman-alpha -galaxy correlation and galaxy-galaxy correlation functions.
Churchill Chris
Connolly Amy
Holtzman Jon
Kacprzak Glenn G.
Murphy Michael
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