Peeples, Molly S., Weinberg, David H., Davé, Romeel, Fardal, Mark A., Katz, Neal
We examine the impact of gas pressure on the transverse coherence of high-redshift (2
Peeples, Molly S., Weinberg, David H., Davé, Romeel, Fardal, Mark A., Katz, Neal
In the low density intergalactic medium (IGM) that gives rise to the Lyman-alpha forest, gas temperature and density are tightly correlated. The velocity scale of thermal broadening and the Hubble...
The Nature of Sub-millimetre Galaxies in Cosmological Hydrodynamic Simulations (2009)
Davé, Romeel, Finlator, Kristian, Oppenheimer, Benjamin D., Fardal, Mark, Katz, Neal, Kereš, Dušan, ...
We study the nature of rapidly star-forming galaxies at z=2 in cosmological hydrodynamic simulations, and compare their properties to observations of sub-millimetre galaxies (SMGs). We identify...
Quenching Star Formation: Can AGN Do the Trick? (2009)
We post-process galaxy star formation histories in cosmological hydrodynamics simulations to test quenching mechanisms associated with AGN. By comparing simulation results to color-magnitude diagrams...
Lyman-alpha Emission From Cosmic Structure I: Fluorescence (2009)
Kollmeier, Juna A., Zheng, Zheng, Davé, Romeel, Gould, Andrew, Katz, Neal, Miralda-Escudé, Jordi, ...
We present predictions for the fluorescent Lyman-alpha emission signature arising from photoionized, optically thick structures in Smoothed Particle Hydrodynamic (SPH) cosmological simulations of a...
Astronomical Software Wants To Be Free: A Manifesto (2009)
Weiner, Benjamin J., Blanton, Michael R., Coil, Alison L., Cooper, Michael C., Davé, Romeel, Hogg, David W., ...
Astronomical software is now a fact of daily life for all hands-on members of our community. Purpose-built software for data reduction and modeling tasks becomes ever more critical as we handle...
Missing Halo Baryons and Galactic Outflows (2009)
We present predictions for galactic halo baryon fractions from cosmological hydrodynamic simulations with a well-constrained model for galactic outflows. Without outflows, halos contain roughly the...
Tracing the Reionization-Epoch Intergalactic Medium with Metal Absorption Lines (2009)
Oppenheimer, Benjamin D., Davé, Romeel, Finlator, Kristian
IGM metal absorption lines observed in z>6 spectra offer the opportunity to probe early feedback processes, the nature of enriching sources, and the topology of reionization. We run high-resolution...
Extended Lyman Alpha Nebulae at z ~ 2.3: An Extremely Rare and Strongly Clustered Population? (2008)
Yang, Yujin, Zabludoff, Ann, Tremonti, Christy, Eisenstein, Daniel, Davé, Romeel
To obtain an unbiased sample of bright LyA blobs [L(LyA) > 10^43 ergs/s], we have undertaken a blind, wide-field, narrow-band imaging survey in the NOAO Deep Wide Field Survey Bootes field with the...
Enrichment and Pre-Heating in Intragroup Gas from Galactic Outflows (2008)
Davé, Romeel, Oppenheimer, Benjamin D., Sivanandam, Suresh
We examine metal and entropy content in galaxy groups having T_X~0.5-2 keV in cosmological hydrodynamic simulations. Our simulations include a well-constrained prescription for galactic outflows...
Mass, Metal, and Energy Feedback in Cosmological Simulations (2007)
Oppenheimer, Benjamin D., Davé, Romeel
Using Gadget-2 cosmological hydrodynamic simulations including an observationally-constrained model for galactic outflows, we investigate how feedback from star formation distributes mass, metals,...
The evolution of the galaxy stellar mass--star formation rate relationship (M*-SFR) provides key constraints on the stellar mass assembly histories of galaxies. For star-forming galaxies, M*-SFR is...
Cattaneo, Andrea, Blaizot, Jérémy, Weinberg, David H., Keres, Dusan, Colombi, Stephane, Davé, Romeel, ...
When Does the Intergalactic Medium Become Enriched? (2006)
Oppenheimer, Benjamin D., Davé, Romeel, Finlator, Kristian
We use cosmological hydrodynamic simulations including galactic feedback based on observations of local starbursts to find a self-consistent evolutionary model capable of fitting the observations of...
The Enrichment History of Baryons in the Universe (2006)
Davé, Romeel, Oppenheimer, Benjamin D.
We present predictions for the cosmic metal budget in various phases of baryons from redshift z=6-0, taken from a cosmological hydrodynamic simulation that includes a well-constrained model for...
Cosmological Simulations of Intergalactic Medium Enrichment from Galactic Outflows (2006)
Oppenheimer, Benjamin D., Davé, Romeel
We investigate models of self-consistent chemical enrichment of the intergalactic medium (IGM) from z=6 to 1.5, based on hydrodynamic simulations of structure formation that incorporate galactic...
Baryon Dynamics, Dark Matter Substructure, and Galaxies (2006)
Weinberg, David H., Colombi, Stephane, Davé, Romeel, Katz, Neal
By comparing a collisionless cosmological N-body simulation (DM) to an SPH simulation with the same initial conditions, we investigate the correspondence between the dark matter subhalos produced by...
From Galaxy-Galaxy Lensing to Cosmological Parameters (2005)
Yoo, Jaiyul, Tinker, Jeremy L., Weinberg, David H., Zheng, Zheng, Katz, Neal, Davé, Romeel
Galaxy-galaxy lensing measures the mean excess surface density DS(r) around a sample of lensing galaxies. We develop a method for combining DS(r) with the galaxy correlation function xi_gg(r) to...
The Physical Properties and Detectability of Reionization-Epoch Galaxies (2005)
Davé, Romeel, Finlator, Kristian, Oppenheimer, Benjamin D.
We present predictions drawn from cosmological hydrodynamic simulations for the physical, photometric and emission line properties of galaxies present during the latter stages of reionization from...
Building Galaxies with Simulations (2005)
Davé, Romeel, Finlator, Kristian, Hernquist, Lars, Katz, Neal, Kereš, Dušan, Papovich, Casey, ...
We present an overview of some of the issues surrounding current models of galaxy formation, highlighting recent insights obtained from cosmological hydrodynamic simulations. Detailed examination of...
Simulations of Early Galaxy Formation (2005)
We present the predictions for the photometric and emission line properties of galaxies present during the latter stages of reionization from z=8 to 6. These preliminary predictions are made from...
Probing Galaxy Formation with He II Cooling Lines (2005)
Yang, Yujin, Zabludoff, Ann I., Davé, Romeel, Eisenstein, Daniel J., Pinto, Philip A., Katz, Neal, ...
Using high resolution cosmological simulations, we study hydrogen and helium gravitational cooling radiation. We focus on the HeII cooling lines, which arise from gas with a different temperature...
Time dependent non-LTE calculations of ionisation in the early universe (2005)
Wehrse, R., Wickramasinghe, D. T., Davé, Romeel
We present a new implicit numerical algorithm for the calculation of the time dependent non-Local Thermodynamic Equilibrium of a gas in an external radiation field that is accurate, fast and...
Bouché, Nicolas, Gardner, Jeffrey P., Katz, Neal, Weinberg, David H., Davé, Romeel, Lowenthal, James D.
Interpreting the Relationship Between Galaxy Luminosity, Color and Environment (2004)
Berlind, Andreas A., Blanton, Michael R., Hogg, David W., Weinberg, David H., Davé, Romeel, Eisenstein, Daniel J., ...
We study the relationship between galaxy luminosity, color, and environment in a cosmological simulation of galaxy formation. We compare the predicted relationship with that found for SDSS galaxies...
Searching for star formation beyond reionization (2004)
Davé, Romeel, Smith, John-David T., Papovich, Casey, Hernquist, Lars, Springel, Volker
Simulations of the Intergalactic Medium (2003)
I present a review by epoch of baryons in the intergalactic medium (IGM), from the first star until today. Recent observations indicate a protracted period of reionization, suggesting multiple...
Lyman Alpha Absorber Correlations and the Bias of the Lyman Alpha Forest (2002)
Davé, Romeel, Katz, Neal, Weinberg, David H.
Lyman alpha absorber correlations contain information about the underlying density distribution associated with a particular class of absorbers. As such, they provide an opportunity to independently...
The Halo Occupation Distribution and the Physics of Galaxy Formation (2002)
Berlind, Andreas A., Weinberg, David H., Benson, Andrew J., Baugh, Carlton M., Cole, Shaun, Davé, Romeel, ...
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 of a particular...
X-Ray Scaling Relations of Galaxy Groups in a Hydrodynamic Cosmological Simulation (2002)
Davé, Romeel, Katz, Neal, Weinberg, David H.
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 gravity, gas dynamics,...
Group Scaling Relations From a Cosmological Hydrodynamic Simulation: No Pre-heating Required? (2001)
Davé, Romeel, Katz, Neal, Hernquist, Lars, Weinberg, David
We investigate the X-ray vs. optical scaling relations of poor groups to small clusters (sigma~100-700 km/s) identified in a cosmological hydrodynamic simulation of a Lambda-CDM universe, with...
The Metallicity of the Local IGM from the HST/STIS Spectrum of 3C273 (2001)
Davé, Romeel, Heap, S. R., Williger, G. M., Weymann, R. J., Tripp, T. M., Jenkins, E. B.
We present a preliminary study of the metallicity of low-redshift Lyman alpha absorbers from the HST/STIS spectrum of 3C273. Using a pixel-based shift-and-coadd technique, we compare observations to...
Sub-mm Galaxies in Cosmological Simulations (2001)
Fardal, Mark A., Katz, Neal, Weinberg, David H., Davé, Romeel, Hernquist, Lars
We study the predicted sub-mm emission from massive galaxies in a Lambda-CDM universe, using hydrodynamic cosmological simulations. Assuming that most of the emission from newly formed stars is...
The Evolution of the Lyman Alpha Forest From Redshift 3 to 0 (2001)
I review results obtained from studies of the high-redshift Lyman alpha forest, and present new results from HST/STIS spectra of low-redshift quasars in comparison with cosmological hydrodynamic...
We examine the Ly-alpha absorber population at z
Baryons in the Warm-Hot Intergalactic Medium (2000)
Davé, Romeel, Cen, Renyue, Ostriker, Jeremiah P., Bryan, Greg L., Hernquist, Lars, Katz, Neal, ...
Approximately 30-40% of all baryons in the present day universe reside in a warm-hot intergalactic medium (WHIM), with temperatures between 10^5
Cooling Radiation and the Lyman-alpha Luminosity of Forming Galaxies (2000)
Fardal, Mark A., Katz, Neal, Gardner, Jeffrey P., Hernquist, Lars, Weinberg, David H., Davé, Romeel
We examine the cooling radiation from forming galaxies in hydrodynamic simulations of the LCDM model (cold dark matter with a cosmological constant), focusing on the Ly-alpha line luminosities of...
Halo Properties in Cosmological Simulations of Self-Interacting Cold Dark Matter (2000)
Davé, Romeel, Spergel, David N., Steinhardt, Paul J., Wandelt, Benjamin D.
We present a comparison of halo properties in cosmological simulations of collisionless cold dark matter (CDM) and self-interacting dark matter (SIDM) for a range of dark matter cross sections. We...
Narayanan, Vijay K., Spergel, David N., Davé, Romeel, Ma, Chung-Pei
High resolution N-body simulations of cold dark matter (CDM) models predict that galaxies and clusters have cuspy halos with excessive substructure. Observations reveal smooth halos with central...
The Nature of Lyman Break Galaxies in Cosmological Hydrodynamic Simulations (1999)
Davé, Romeel, Gardner, Jeffrey P., Hernquist, Lars, Katz, Neal, Weinberg, David H.
What type of objects are being detected as $z\sim 3$ "Lyman break galaxies"? Are they predominantly the most massive galaxies at that epoch, or are many of them smaller galaxies undergoing a...
Evolution of Clustering and Bias in a Lambda-CDM Universe (1999)
Davé, Romeel, Hernquist, Lars, Katz, Neal, Weinberg, David H.
We determine the evolution from $z=3\to 0$ of the galaxy and mass correlation functions and bias factor in a $50h^{-1}$Mpc $\Lambda$CDM hydrodynamic simulation with $10h^{-1}$kpc resolution. The mass...
Constraining the Metallicity of the Low Density Lyman-alpha Forest Using OVI Absorption (1998)
Davé, Romeel, Hellsten, Uffe, Hernquist, Lars, Katz, Neal, Weinberg, David
We search for OVI absorption in a Keck HIRES spectrum of the z=3.62 quasar Q1422+231. Comparison of CIV measurements to cosmological simulations shows that \lya forest absorbers with N_HI > 10^{14.5}...
Davé, Romeel, Hellinger, Doug, Primack, Joel, Nolthenius, Richard, Klypin, Anatoly
A new class of geometric statistics for analyzing galaxy catalogs is presented. Filament statistics quantify filamentarity and planarity in large scale structure in a manner consistent with catalog...
Voigt-Profile Analysis of the Lyman-alpha Forest in a Cold Dark Matter Universe (1996)
Davé, Romeel, Hernquist, Lars, Weinberg, David, Katz, Neal
We use an automated Voigt-profile fitting procedure to extract statistical properties of the Ly$\alpha$ forest in a numerical simulation of an $\Omega=1$, cold dark matter (CDM) universe. Our...
Davé, Romeel, Hernquist, Lars, Weinberg, David H., Katz, Neal
We use an automated Voigt-profile fitting procedure to extract statistical properties of the Ly$\alpha$ forest in a numerical simulation of an $\Omega=1$, cold dark matter (CDM) universe. Our...
Davé, Romeel, Hellinger, Doug, Nolthenius, Richard, Primack, Joel, Klypin, Anatoly
A new class of geometric statistics for analyzing galaxy catalogs is presented. {\it Filament statistics} quantify filamentarity and planarity in large scale structure in a manner consistent with...