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44 papers · 2 filters
The Opacity of the Lyman Alpha Forest and Implications for Omega_{baryon} and the Ionizing Background
M. Rauch, J. Miralda-Escude, W. L. W. Sargent +6
We have measured the distribution function of the flux decrement caused by Lyman alpha forest absorption in a new sample of high resolution QSO spectra. The observations are compar…
A survey for large image-separation lensed quasars
Dan Maoz, Hans-Walter Rix, Avishay Gal-Yam +1
The statistics of gravitationally lensed quasars with multiple images in the 0.1''-7'' range have been measured in various surveys. Little is known, however, about lensed-quasar st…
Signatures of Accretion Disks in Quasar Microlensing
Andrew Gould, Jordi Miralda-Escude
We propose that relative variability on short time-scales of the multiple images of a lensed quasar, after removal of the time delay, may be caused by hot spots or other moving str…
Testing Tree-Level Perturbation Theory for Large-Scale Structure with the Local Lagrangian Approximation
Zacharias A. M. Protogeros, Adrian L. Melott, Robert J. Scherrer
We test tree-level perturbation theory for Gaussian initial conditions with power spectra by comparing the probability distribution function (PDF) for the density…
The Primordial Abundance of He4: An Update
Keith A. Olive, Evan Skillman, Gary Steigman
We include new data in an updated analysis of helium in low metallicity extragalactic HII regions with the goal of deriving the primordial abundance of He4 (Y_P). We show that the…
M Dwarfs From Hubble Space Telescope Star Counts III: The Groth Strip
Andrew Gould, John N. Bahcall, Chris Flynn
We analyze the disk M dwarfs found in 31 new fields observed with the Wide Field Camera (WFC2) on the Hubble Space Telescope (HST) together with the sample previously analyzed from…