Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943518c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #435.18
Astronomy and Astrophysics
Astronomy
Scientific paper
The CIV doublet has proven to be an important tracer of the IGM and its evolution from z = 6 to 0. These transitions have been well-studied at high redshifts because: they are strong transitions of common metals; they are observable outside the Ly-alpha forest, where they become easier to identify; they redshift into optical passbands for 1.5 < z < 4.5; and they are resonant doublets, which give them distinctive characteristics and enable the survey to be largely automated. However, the 1.5 < z < 4.5 results can be vastly improved by surveying the thousands of SDSS DR7 QSOs. Having done this, we now present early results on the over 15,000 CIV systems that we identified. We are constructing a uniform 0 < z < 6 dataset by combining the SDSS survey with the z < 1 HST results (Cooksey et al. 2010) and the new z > 5 FIRE results (Simcoe et al. 2011). Thus, we can compare apples-to-apples: the absorber line density over time and the CIV mass density evolution. This is the first in a series on our surveys for various metal-line absorption systems in SDSS DR7 QSOs.
Cooksey Kathy
Kao Melodie M.
O'Meara John
Prochaska Jason
Seyffert E.
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