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Uncertainties in the Determination of Primordial D/H
Antoinette Songaila
The current status of high redshift D/H measurements is discussed. I first examine whether the observations of HS1937-1009 require a low value of D/H. It is shown that the LRIS mea…
A Lower Limit to the Universal Density of Metals at z \sim 3
Antoinette Songaila
Column density distribution functions of CIV with 12.05 < log (N) < 14.35 and SiIV with 11.70 < log (N) < 13.93 have been obtained using 81 CIV absorbers and 35 SiIV absorbers redw…
The Redshift Evolution of the Lyman Alpha Forest
Tae-Sun Kim, Esther M. Hu, Lennox L. Cowie +1
We have analyzed the properties of low column density Lyman alpha forest clouds (12.8 < log N_HI < 16.0) toward 5 QSOs at different redshifts, using high signal-to-noise data from…
The Evolution of the Distribution of Star Formation Rates in Galaxies
Lennox L. Cowie, Esther M. Hu, Antoinette Songaila +1
A large deep and nearly complete B<24.5 redshift sample is used to measure the change in distribution function of the stellar mass production rate in individual galaxies with redsh…
Faint M-dwarfs and the structure of the Galactic disk
I. N. Reid, J. E. Gizis, J. G. Cohen +5
We use broadband photometry and low-resolution spectra of a complete sample of late-K and M dwarfs brighter than I=22 in three fields at high galactic latitude to study issues rela…