Mathematics – Logic
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt........29c&link_type=abstract
Ph.D dissertation, 2004. 137 pages; United States -- California: University of California, Berkeley; 2004. Publication Number:
Mathematics
Logic
3
Universe, Supernovae, Galaxy Evolution, Redshift Surveys
Scientific paper
This thesis presents observational results detailing the state of the Universe ~5-9 billion years ago, focusing primarily on the spatial distribution and clustering of galaxies.
We first present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) at maximum light, discovered by the High-z Supernova Search Team: SN 1999ff at z = 0.455 and SN 1999fv at z ~=
1.2. We compare our high- z spectra with low- z normal and peculiar SNe Ia as well as with SNe Ic, Ib, and II and find that are no significant differences between SN 1999ff and SN1999fv and normal SNe la at low redshift. This solidifies the use of type Ia SNe as standard candles at cosmological distances.
We then develop and test mock galaxy catalogs to be used for the DEEP2 Galaxy Redshift Survey, which will obtain redshifts for ~50,000 galaxies between 0.7 < z < 1.5, mapping the galaxy distribution in a comoving volume of roughly 7 x 10 6 Mpc 3 h -3 .
Using data from the first observing season of the DEEP2 Redshift Survey, we measure the amplitude of galaxy clustering using the two-point correlation function, x( r ), for a sample of 2219 galaxies between 0.7 < z < 1.35. We find that galaxies are significantly less clustered at z ~ 1 relative to z ~ 0; r 0 ~ 3.0-3.5 h -1 Mpc (comoving). We find that red, absorption-dominated, passively-evolving galaxies have a larger clustering scale length than blue, emission-line, actively star-forming galaxies. Intrinsically brighter galaxies also cluster more strongly than fainter galaxies at z ~= 1. Our results imply that the DEEP2 galaxies have an effective bias b ~ 1.0-1.2, lower than what is predicted by semi-analytic simulations at z ~= 1, which may be the result of our R -band target selection. Our results demonstrate that galaxy clustering properties as a function of color, spectral type and luminosity seen in the local Universe were largely in place by z ~= 1.
We also present measurements of the projected angular two-point correlation function, o([straight theta]), as a function of I AB magnitude and ( R - I ) color for a sample of ~350, 000 galaxies covering 5 degrees 2 . Using redshifts of 3319 galaxies in early DEEP2 Redshift Survey data, we construct robust galaxy redshift distributions as a function of magnitude and color for galaxies between 0 < z < 2. (Abstract shortened by UMI.)
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