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Lyman Alpha Absorber Correlations and the Bias of the Lyman Alpha Forest
Romeel Davé, Neal Katz, David H. Weinberg
Lyman alpha absorber correlations contain information about the underlying density distribution associated with a particular class of absorbers. As such, they provide an opportunit…
Galaxy Clustering and Galaxy Bias in a Lambda-CDM Universe
David H. Weinberg, Romeel Dav'e, Neal Katz +1
We investigate galaxy clustering and galaxy-mass correlations in the LCDM cosmological model using a large volume SPH simulation. For the most part, the predicted biases between ga…
The Galaxy Proximity Effect in the Lyman-alpha Forest
Juna A. Kollmeier, David H. Weinberg, Romeel Dave' +1
Hydrodynamic cosmological simulations predict that the average opacity of the Ly-alpha forest should increase in the neighborhood of galaxies because galaxies form in dense environ…
The overdensities of galaxy environments as a function of luminosity and color
David W. Hogg, Michael R. Blanton, Daniel J. Eisenstein +9
We study the mean environments of galaxies in the Sloan Digital Sky Survey as a function of rest-frame luminosity and color. Overdensities in galaxy number are estimated in $8 h^{-…
The Halo Occupation Distribution and the Physics of Galaxy Formation
Andreas A. Berlind, David H. Weinberg, Andrew J. Benson +7
The halo occupation distribution (HOD) describes the bias between galaxies and dark matter by specifying (a) the probability P(N|M) that a halo of virial mass M contains N galaxies…
X-ray Observations of the Warm-Hot Intergalactic Medium
Smita Mathur, David H. Weinberg, Xuelei Chen
We present Chandra observations that provide the most direct evidence to date for the pervasive, moderate density, shock-heated intergalactic medium predicted by leading cosmologic…
The Galaxy Luminosity Function and Luminosity Density at Redshift z=0.1
Michael R. Blanton, David W. Hogg, J. Brinkmann +16
Using a catalog of 147,986 galaxy redshifts and fluxes from the Sloan Digital Sky Survey (SDSS) we measure the galaxy luminosity density at z=0.1 in five optical bandpasses corresp…
The Broad-band Optical Properties of Galaxies with Redshifts 0.0 < z < 0.2
M. R. Blanton, D. W. Hogg, N. A. Bahcall +18
Using photometry and spectroscopy of 144,609 galaxies from the Sloan Digital Sky Survey, we present bivariate distributions of pairs of seven galaxy properties: four optical colors…
How Do Galaxies Get Their Gas?
Neal Katz, Dusan Keres, Romeel Dave +1
Not the way one might have thought. In hydrodynamic simulations of galaxy formation, some gas follows the traditionally envisioned route, shock heating to the halo virial temperatu…
Lyman Break Galaxies and the Lyman-alpha Forest
Juna A. Kollmeier, David H. Weinberg, Romeel Dave' +1
We use hydrodynamic simulations to predict correlations between Lya forest absorption and galaxies at redshift z~3. The probability distribution function (PDF) of Lya flux decremen…
Two-Dimensional Topology of the Sloan Digital Sky Survey
Fiona Hoyle, Michael S. Vogeley, J. Richard Gott +6
We present the topology of a volume-limited sample of 11,884 galaxies, selected from an apparent-magnitude limited sample of over 100,000 galaxies observed as part of the Sloan Dig…
Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample
Michael A. Strauss, David H. Weinberg, Robert H. Lupton +1
We describe the algorithm that selects the main sample of galaxies for spectroscopy in the Sloan Digital Sky Survey from the photometric data obtained by the imaging survey. Galaxy…
Tracing the Warm-Hot Intergalactic Medium at Low Redshift: X-ray Forest Observations Towards H1821+643
Smita Mathur, David Weinberg, Xuelei Chen +1
We present a high resolution (R~500) X-ray spectrum of the bright quasar H1821+643 (z=0.297), obtained in a 470 ksec Chandra observation. We search for X-ray absorption by highly i…
X-Ray Scaling Relations of Galaxy Groups in a Hydrodynamic Cosmological Simulation
Romeel Davé, Neal Katz, David H. Weinberg
We examine the scalings of X-ray luminosity, temperature, and dark matter or galaxy velocity dispersion for galaxy groups in an LCDM cosmological simulation, which incorporates gra…
Stellar Masses and Star Formation Histories for 10^5 Galaxies from the Sloan Digital Sky Survey
Guinevere Kauffmann, Timothy M. Heckman, Simon D. M. White +19
We develop a new method to constrain the star formation histories, dust attenuation and stellar masses of galaxies. It is based on two stellar absorption line indices, the 4000 Ang…
X-ray Absorption by the Low-redshift Intergalactic Medium: A Numerical Study of the Lambda CDM model
Xuelei Chen, David H. Weinberg, Neal Katz +1
Using a hydrodynamic simulation of a LCDM universe, we investigate the "X-ray forest" absorption imprinted on the spectra of background quasars by the intervening intergalactic med…
Studying Structure Formation with the Sloan Digital Sky Survey
David H. Weinberg
I review recent SDSS results related to galaxies and large scale structure, including: (1) discovery of coherent, unbound structures in the stellar halo, (2) demonstration that Pal…
Do Distinct Cosmological Models Predict Degenerate Halo Populations?
Zheng Zheng, Jeremy L. Tinker, David H. Weinberg +1
Using cosmological N-body simulations, we investigate the influence of the matter density parameter Omega_m and the linear theory power spectrum P(k) on statistical properties of t…