The Distribution of Metals in the High Redshift Circumgalactic Medium Around Milky Way Progenitors
Abstract
In an effort to understand the connection between star formation, feedback, and the circumgalactic medium (CGM), we examine mock quasar spectra through the CGM (within ~200 kpc) of simulated non-group Milky Way progenitors at redshifts 2.5 and 4. The galaxies were simulated in the cosmological setting using Eulerian Gasdynamics plus N-body Adaptive Refinement Tree (ART) code with a resolution of 35-70 pc with two different star formation rates. The first simulations use a Miller-Scalo IMF and did not account for radiation pressure. The second simulations use a Chabrier IMF with a star formation efficiency one third of the first simulations, as well as description of radiation pressure. We measure the absorption lines of several ions including CIV, OVI, SiIV, and Ly beta and compare the covering fraction, equivalent width distribution and the velocity distribution at both redshifts and both star formation recipes. We also compare these to the observational results of the Keck-Baryon Structure Survey (Steidel et al., 2010) for z=2-3 star-forming galaxies.
- Publication:
-
American Astronomical Society Meeting Abstracts #221
- Pub Date:
- January 2013
- Bibcode:
- 2013AAS...22122707V