5.4k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR397 papers
- Los Alamos National LaboratoryUS396 papers
- Columbia UniversityUS325 papers
- The University of TokyoJP311 papers
- Brookhaven National LaboratoryUS309 papers
- Vanderbilt UniversityUS293 papers
- University of MichiganUS291 papers
- University of Tennessee at KnoxvilleUS266 papers
- University of Illinois Urbana-ChampaignUS263 papers
- Pennsylvania State UniversityUS262 papers
- University of WashingtonUS252 papers
- Eötvös Loránd UniversityHU250 papers
30 papers · 2 filters
On effects of resolution in dissipationless cosmological simulations
Alexander Knebe, Andrey V. Kravtsov, Stefan Gottloeber +1
We present a study of numerical effects in dissipationless cosmological simulations. The numerical effects are evaluated and studied by comparing results of a series of 64^3-partic…
Measuring the Mass of the Black Hole in GS2000+25 Using IR Ellipsoidal Variations
Dawn M. Leeber, Thomas E. Harrison, Bernard J. McNamara
Soft X-ray Transients (SXTs) are binary systems that are believed to consist of a black hole and a normal late type dwarf star which fills its Roche Lobe. We have used GRIM II on t…
Searches for HI in the Outer Parts of Four Dwarf Spheroidal Galaxies
L. M. Young
Previous searches for atomic gas in our Galaxy's dwarf spheroidal companions have not been complete enough to settle the question of whether or not these galaxies have HI, especial…
Spatial and Velocity Biases
Anatoly Klypin, Andrey V. Kravtsov, Pedro Colin
We give a summary of our recent studies of spatial and velocity biases of galaxy-size halos in cosmological models. Recent progress in numerical techniques made it possible to simu…
The Low Resolution Spectrograph of the Hobby-Eberly Telescope II. Observations of Quasar Candidates from the Sloan Digital Sky Survey
D. P. Schneider, Gary J. Hill, X. Fan +1
This paper describes spectra of quasar candidates acquired during the commissioning phase of the Low-Resolution Spectrograph of the Hobby-Eberly Telescope. The objects were identif…
X-ray and Radio Interactions in the Cores of Cooling Flow Clusters
E. Rizza, C. Loken, M. Bliton +3
We present high resolution ROSAT x-ray and radio observations of three cooling flow clusters containing steep spectrum radio sources at their cores. All three systems exhibit stron…
L Dwarfs Found in Sloan Digital Sky Survey Commissioning Imaging Data
SDSS Collaboration, Xiaohui Fan
This paper describes the discovery of seven dwarf objects of spectral type `L' (objects cooler than the latest M dwarfs) in commissioning imaging data taken by the Sloan Digital Sk…
The evolution of groups and clusters
S. Gottloeber, A. Klypin, A. V. Kravtsov +1
Using high resolution N-body simulations we have studied the formation and evolution of clusters and groups in a LCDM cosmological model. Groups of galaxies have been formed alread…
Merging Rate of Dark Matter Halos: Evolution and Dependence on Environment
Stefan Gottloeber, Anatoly Klypin, Andrey V. Kravtsov
We discuss the impact of the cosmological environment on the evolution of dark matter halos using a high-resolution simulation within a spatially flat LCDM cosmology.
Spectrophotometry of HII Regions, Diffuse Ionized Gas and Supernova Remnants in M31: The Transition from Photo- to Shock-Ionization
V. C. Galarza, R. A. M. Walterbos, R. Braun
We present results of KPNO 4-m optical spectroscopy of discrete emission-line nebulae and regions of diffuse ionized gas (DIG) in M31. Long-slit spectra of 16 positions in the NE h…
An X-ray and Optical Investigation of the Environments Around Nearby Radio Galaxies
N. A. Miller, F. N. Owen, J. O. Burns +2
Investigations of the cluster environment of radio sources have not shown a correlation between radio power and degree of clustering. However, it has been demonstrated that extende…
Profiles of dark haloes: evolution, scatter, and environment
James S. Bullock, Tsafrir S. Kolatt, Yair Sigad +5
We study dark-matter halo density profiles in a high-resolution N-body simulation of an LCDM cosmology. Our statistical sample contains ~5000 haloes in the range 10^{11}-10^{14} M_…
The Near-Infrared and Optical Spectra of Methane Dwarfs and Brown Dwarfs
Adam Burrows, M. S. Marley, C. M. Sharp
We identify the pressure--broadened red wings of the saturated potassium resonance lines at 7700 Åas the source of anomalous absorption seen in the near-infrared spectra of Gliese…
Velocity bias in a LCDM model
Pedro Colin, Anatoly Klypin, Andrey V. Kravtsov
We use N-body simulations to study the velocity bias of dark matter halos, the difference in the velocity fields of dark matter and halos, in a flat low- density LCDM model. The hi…
Density profiles of dark matter haloes: diversity and dependence on environment
V. Avila-Reese, C. Firmani, A. Klypin +1
(Abridged) We study the outer density profiles of dark matter haloes predicted by a generalized secondary infall model and observed in a N-body cosmological simulation of a ΛCDM mo…
A catalog of Nearby Poor Clusters of Galaxies
R. A. White, M. Bliton, S. P. Bhavsar +4
A catalog of 732 optically selected, nearby poor clusters of galaxies covering the entire sky north of declination is presented. The poor clusters, called WBL clus…
Observations and Implications of the Star Formation History of the LMC
J. A. Holtzman, J. S. Gallagher, A. A. Cole +3
We present derivations of star formation histories based on color-magnitude diagrams of three fields in the LMC from HST/WFPC2 observations. A significant component of stars older…
HII Shells Surrounding Wolf-Rayet stars in M31
M. A. Bransford, D. A. Thilker, R. A. M. Walterbos +1
We present the results of an ongoing investigation to provide a detailed view of the processes by which massive stars shape the surrounding interstellar medium (ISM), from pc to kp…
Quantifying the evolution of higher-order clustering
Jens Schmalzing, Stefan Gottloeber, Anatoly A. Klypin +1
We use a high-resolution dissipationless simulation to study the evolution of the dark matter and halo distributions in a spatially flat cosmological model dominated by a cosmologi…
The Santa Barbara cluster comparison project: a comparison of cosmological hydrodynamics solutions
C. S. Frenk, S. D. M. White, P. Bode +22
We have simulated the formation of an X-ray cluster in a cold dark matter universe using 12 different codes. The codes span the range of numerical techniques and implementations cu…
Young galaxies: what turns them on?
Tsafrir S. Kolatt, James S. Bullock, Rachel S. Somerville +8
Lyman break galaxies (LBGs) at exhibit number densities and clustering similar to local galaxies; however, their star formation rates (SFRs) are much higher. We ex…
The Discovery of a Field Methane Dwarf from Sloan Digital Sky Survey Commissioning Data
SDSS Collaboration, Michael A. Strauss
We report the discovery of the coolest field dwarf yet known, selected as a stellar object with extremely red colors from commissioning imaging data of the Sloan Digital Sky Survey…
Stellar Populations at the Center of IC 1613
Andrew A. Cole, Eline Tolstoy, John S. Gallagher +18
We have observed the center of the Local Group dwarf irregular galaxy IC 1613 with WFPC2 aboard the Hubble Space Telescope in the F439W, F555W, and F814W filters. We find a dominan…
The HI and Ionized Gas Disk of the Seyfert Galaxy NGC 1144 = Arp 118: A Violently Interacting Galaxy with Peculiar Kinematics
M. A. Bransford, P. N. Appleton, C. F. McCain +1
We present observations of the distribution and kinematics of neutral and ionized gas in NGC 1144, a galaxy that forms part of the Arp 118 system. Ionized gas is present over a hug…