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
100 papers · 2 filters
The Era of Reionization
Piero Madau
In popular cold dark matter cosmological scenarios, stars may have first appeared in significant numbers around a redshift of 10 or so, as the gas within protogalactic halos with v…
How Massive Single Stars End their Life
A. Heger, C. L. Fryer, S. E. Woosley +2
How massive stars die -- what sort of explosion and remnant each produces -- depends chiefly on the masses of their helium cores and hydrogen envelopes at death. For single stars,…
An Intrinsic Baldwin Effect in the H-beta Broad Emission Line in the Spectrum of NGC 5548
Karoline M. Gilbert, Bradley M. Peterson
We investigate the possibility of an intrinsic Baldwin Effect (i.e.,nonlinear emission-line response to continuum variations) in the broad H-beta emission line of the active galaxy…
The Spatial, Ionization, and Kinematic Conditions of the z=1.39 Damped Ly-alpha Absorber in Q0957+561 A,B
Chris Churchill, Rick Mellon, Jane Charlton +1
We examined the sizes of the absorption clouds in a z=1.3911 damped Ly-alpha absorber (DLA) in the double image lensed quasar Q0957+561 A,B (separation 135 pc at the absorber redsh…
Spectroscopy of Globular Clusters in the Fornax dwarf galaxy
Jay Strader, Jean P. Brodie, Duncan A. Forbes +2
We present low resolution, integrated Keck spectra of the five globular clusters (GCs) of the Fornax dwarf spheroidal galaxy. We find a tentative age spread among the clusters, wit…
Turbulence in Accretion Disks. Vorticity Generation and Angular Momentum Transport via the Global Baroclinic Instability
Hubert Klahr, Peter Bodenheimer
In this paper we present the global baroclinic instability as a source for vigorous turbulence leading to angular momentum transport in Keplerian accretion disks. We show by analyt…
On the Origin of Nitrogen in Damped Ly-alpha Systems
R. B. C. Henry, Jason X. Prochaska
Recent measurements of nitrogen and alpha elements in over 20 damped Ly-alpha systems (DLA) are compared with similar measurements for numerous emission line objects and stars. It…
Evidence for An Intermediate-Age, Metal-rich Population of Globular Clusters in NGC 4365
S. S. Larsen, J. P. Brodie, M. A. Beasley +4
We present spectroscopy for globular clusters (GCs) in the elliptical galaxy NGC 4365, obtained with the LRIS spectrograph on the Keck I telescope. Previous studies have shown that…
Advanced Camera for Surveys Observations of Young Star Clusters in the Interacting Galaxy UGC 10214
Hien D. Tran, M. Sirianni, H. C. Ford +31
We present the first Advanced Camera for Surveys (ACS) observations of young star clusters in the colliding/merging galaxy UGC 10214. The observations were made as part of the Earl…
A Population of Intergalactic Supernovae in Galaxy Clusters
Avishay Gal-Yam, Dan Maoz, Puragra Guhathakurta +1
We have discovered seven type Ia cluster supernovae (SNe) in the course of the Wise Observatory Optical Transients Search in the fields of galaxy clusters with redshifts between z=…
Optical Diffuse Light in Nearby Compact Groups
C. Mendes de Oliveira, C. Da Rocha, C. R. Rabaça +2
Analyses of B and R band observations of four compact groups reveal the presence of a considerable amount of diffuse, intergalactic light in two of them (HCG 79 and HCG 95). The di…
Damped Lyman alpha systems and galaxy formation models - II. High ions and Lyman limit systems
Ariyeh H. Maller, Jason X. Prochaska, Rachel S. Somerville +1
We investigate a model for the high-ionization state gas associated with observed damped Lyman-alpha systems, based on a semi-analytic model of galaxy formation set within the para…
Keck Spectroscopy of Globular Clusters in the Elliptical Galaxy NGC 3610
Jay Strader, Jean P. Brodie, Francois Schweizer +2
We present moderate-resolution Keck spectra of nine candidate globular clusters in the possible merger-remnant elliptical galaxy NGC 3610. Eight of the objects appear to be bona fi…
Gamma-Ray Bursts and Jet-Powered Supernovae
S. E. Woosley, W. Zhang, A. Heger
The last five years have seen growing challenges to the traditional paradigm of a core collapse supernova powered by the neutrino emission of a young proto-neutron star. Chief amon…
Massive Star Evolution Through the Ages
A. Heger, S. E. Woosley, C. L. Fryer +1
We review the current basic picture of the evolution of massive stars and how their evolution and structure changes as a function of initial mass. We give an overview of the fate o…
Spectroscopy of a Globular Cluster in the Local Group dIrr NGC 6822
Jay Strader, Jean P. Brodie, John P. Huchra
We present low-resolution Keck spectroscopy for the globular cluster H VIII in the Local Group dIrr galaxy NGC 6822. We find the metallicity of the cluster to be [Fe/H]= -1.58 +/-…
Local galaxy flows within 5 Mpc
I. D. Karachentsev, D. I. Makarov, M. E. Sharina +8
We present Hubble Space Telescope/WFPC2 images of sixteen dwarf galaxies as part of our snapshot survey of nearby galaxy candidates. We derive their distances from the luminosity o…
A Globular Cluster Metallicity Scale Based on the Abundance of Fe II
Robert P. Kraft, Inese I. Ivans
Assuming that in the atmospheres of low-mass, metal-poor red giant stars, 1-D models based on LTE accurately predict the abundance of iron from Fe II, we derive a globular cluster…
Globular Clusters in Compact Groups
C. Da Rocha, C. Mendes de Oliveira, M. Bolte +2
We have studied globular cluster systems (GCSs) around elliptical galaxies in Hickson compact groups using multi-band deep, high quality images from Keck, VLT and CFHT. Analyzing t…
Hubble Space Telescope Evidence for an Intermediate-Mass Black Hole in the Globular Cluster M15: II. Kinematical Analysis and Dynamical Modeling
Joris Gerssen, Roeland P. van der Marel, Karl Gebhardt +3
We analyze HST/STIS spectra (see Paper I) of the central region of the dense globular cluster M15. We infer the velocities of 64 individual stars, two-thirds of which have their ve…
Extragalactic Globular Clusters in the Near-Infrared
M. Hempel, M. Kissler-Patig, M. Hilker +5
Visual and near-infrared colours are used to identify intermediate-age globular cluster in early-type galaxies. In NGC5846 and NGC4365 colour-colour diagrams (V-I vs. V-K) reveal a…
Galaxy Flow in the Canes Venatici I Cloud
I. D. Karachentsev, M. E. Sharina, A. E. Dolphin +7
We present an analysis of Hubble Space Telescope/WFPC2 images of eighteen galaxies in the Canes Venatici I cloud. We derive their distances from the luminosity of the tip of the re…
CN abundance variations on the main sequence of 47 Tuc
Daniel Harbeck, Graeme H. Smith, Eva K. Grebel
We report on a deep spectroscopic survey for star-to-star CN variations along the main sequence (MS) of the globular cluster 47 Tuc with ESO's VLT. We find a significant bimodal di…
A multiwavelength approach to the SFR estimation in galaxies at intermediate redshifts
N. Cardiel, D. Elbaz, R. P. Schiavon +4
We use a sample of 7 starburst galaxies at intermediate redshifts (z ~ 0.4 and z ~ 0.8) with observations ranging from the observed ultraviolet to 1.4 GHz, to compare the star form…