Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.6k papers
- University of California, BerkeleyUS2.5k papers
- The Ohio State UniversityUS2.3k papers
- University of ArizonaUS2.1k papers
- Lawrence Berkeley National LaboratoryUS2.1k papers
- SLAC National Accelerator LaboratoryUS2k papers
- University of California, IrvineUS2k papers
- Yale UniversityUS1.9k papers
- University of Wisconsin–MadisonUS1.9k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR1.9k papers
- McGill UniversityCA1.9k papers
- University of ChicagoUS1.9k papers
108 papers · 2 filters
Evolutionary Histories of Dwarf Galaxies in the Local Group
Eva K. Grebel
The star formation histories of Local Group (LG) dwarf galaxies and more distant potential LG members are reviewed. Problems in defining the spatial extent of the LG and membership…
Probing Galaxy Formation with TeV Gamma Ray Absorption
Joel R. Primack, James S. Bullock, Rachel S. Somerville +1
We present here the extragalactic background light (EBL) predicted by semi-analytic models of galaxy formation, and show how measurements of the absorption of gamma rays of …
Constraining the IMF using TeV gamma ray absorption
J. S. Bullock, R. S. Somerville, D. MacMinn +1
Gamma rays of ~TeV energies from distant sources suffer attenuation due to pair production off of ~1 micron EBL photons. We may exploit this process in order to indirectly measure…
Making Damped Lyman Alpha Systems in Semi-Analytic Models
Ariyeh H. Maller, Rachel S. Somerville, Jason X. Prochaska +1
The velocity profiles of weak metal absorption lines can be used to observationally probe the kinematic state of gas in damped Lyman-alpha systems. Prochaska and Wolfe have argued…
Cosmological Implications of Lyman-Break Galaxy Clustering
Risa H. Wechsler, Michael A. K. Gross, Joel R. Primack +3
We review our analysis of the clustering properties of ``Lyman-break'' galaxies (LBGs) at redshift z~3, previously discussed in Wechsler et al (1998). We examine the likelihood of…
An IR Search for Extinguished Supernovae in Starburst Galaxies
Bruce Grossan, Earl Spillar, Robert Tripp +3
IR and Radio band observations of heavily extinguished regions in starburst galaxies suggest a very high SN rate associated with such regions. Optically measured supernova (SN) rat…
Formation of Dark Matter Halos
J. R. Primack, J. S. Bullock, A. A. Klypin +1
This article concerns the formation and structure of dark matter halos, including (1) their radial density profiles, (2) their abundance, and (3) their merger rates. The last topic…
POTENT Reconstruction from Mark III Velocities
A. Dekel, A. Eldar, T. Kolatt +5
We present an improved POTENT method for reconstructing the velocity and mass density fields from radial peculiar velocities, test it with mock catalogs, and apply it to the Mark I…
The HST Key Project on the Extragalactic Distance Scale. XV. A Cepheid Distance to the Fornax Cluster and Its Implications
Barry F. Madore, Wendy L. Freedman, N. Silbermann +13
Using the Hubble Space Telescope (HST) 37 long-period Cepheid variables have been discovered in the Fornax Cluster spiral galaxy NGC 1365. The resulting V and I period-luminosity r…
Precession of collimated outflows from young stellar objects
C. Terquem, J. Eisloffel, J. Papaloizou +1
We consider several protostellar systems where either a precessing jet or at least two misaligned jets have been observed. We assume that the precession of jets is caused by tidal…
Conceptual Design of a Next-Generation All-Sky Gamma-Ray Telescope Operating at TeV Energies
R. S. Miller, S. Westerhoff
The next generation all-sky monitor operating at TeV (0.1 - 30 TeV) energies should be capable of performing a continuous high sensitivity sky survey, and detecting transient sourc…
Properties of Two New M31 dSph Companions from Keck Imaging
Eva K. Grebel, Puragra Guhathakurta
We have obtained Keck Low Resolution Imaging Spectrograph images in V and I of the newly discovered Local Group dwarf galaxies Pegasus dSph and Cassiopeia dSph and their surroundin…
What Can the Accretion Induced Collapse of White Dwarfs Really Explain?
C. L. Fryer, W. Benz, M. Herant +1
The accretion induced collapse (AIC) of a white dwarf into a neutron star has been invoked to explain gamma-ray bursts, Type Ia supernovae, and a number of problematic neutron star…
Towards an Understanding of the Globular Cluster Over--abundance around the Central Giant Elliptical NGC 1399
Markus Kissler-Patig, Carl J. Grillmair, Georges Meylan +3
We investigate the kinematics of a combined sample of 74 globular clusters around NGC 1399. Their high velocity dispersion, increasing with radius, supports their association with…
A Comparison of Metal Enrichment Histories in Rich Clusters and Individual Luminous Elliptical Galaxies
Fabrizio Brighenti, William G. Mathews
Hot, X-ray emitting gaseous halos around massive elliptical galaxies are a result of both stellar mass loss and inflow toward the overdensity from which giant ellipticals and their…
X-Ray Evidence for Multiphase Hot Gas with Solar Abundances in the Brightest Elliptical Galaxies
David A. Buote
We examine whether isothermal models of the hot gas can successfully describe the ASCA and ROSAT spectra of NGC 1399, NGC 4472, NGC 4636, and NGC 5044. Broad-band spectral fitting…
On Measuring Chemical Abundances in Distant Galaxies Using Global Emission Line Spectra
Henry A. Kobulnicky, Robert C. Kennicutt, James L. Pizagno
The advent of 8--10 meter class telescopes enables direct measurement of the chemical properties in the ionized gas of cosmologically--distant galaxies with the same nebular analys…
The Star Formation History in a Hierarchical Universe
Rachel S. Somerville, Joel R. Primack
Observations now probe the star formation history of the Universe back to a redshift of . We investigate whether the predictions of semi-analytic models of galaxy formation…
The Deimos Spectrograph and a Planned DEEP Redshift Survey
Marc Davis, Sandra M. Faber
A second generation spectrograph for the Keck telescope is under construction at the Lick Observatory shops and will be delivered to Hawaii in 1999. Starting in the Fall of 1999, w…
The Mildly Metal-Poor Globular Cluster M4: Star-to-Star Abundance Variations in 20 Giants
I. I. Ivans, C. Sneden, R. P. Kraft
We present a chemical composition analysis of a sample of 20 giant branch stars in the "CN-bimodal" globular cluster M4 observed using high resolution echelle spectrographs at Lick…
The Isolated Elliptical NGC 1132: Evidence For a Merged Group of Galaxies?
John S. Mulchaey, Ann I. Zabludoff
Numerical simulations predict that some poor groups of galaxies have merged by the present epoch into giant ellipticals (cf. Barnes 1989). To identify the possible remnants of such…
Planetary Companions Around Two Solar Type Stars: HD 195019 and HD 217107
D. A. Fischer, G. W. Marcy, R. P. Butler +2
We have enlarged the sample of stars in the planet search at Lick Observatory. Doppler measurements of 82 new stars observed at Lick Observatory, with additional velocities from Ke…
Gas-rich LSB Galaxies -- Progenitors of Blue Compact Dwarfs?
John J. Salzer, Stuart A. Norton
We analyze deep CCD images of nearby Blue Compact Dwarf (BCD) galaxies in an attempt to understand the nature of the progenitors which are hosting the current burst of star formati…
Collapsars - Gamma-Ray Bursts and Explosions in "Failed Supernovae"
A. MacFadyen, S. E. Woosley
Using a two-dimensional hydrodynamics code (PROMETHEUS), we study the continued evolution of rotating massive helium stars whose iron core collapse does not produce a successful ou…