4k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of California, Santa CruzUS948 papers
- Space Telescope Science InstituteUS207 papers
- Center for Astrophysics Harvard & SmithsonianUS153 papers
- Max Planck Institute for AstronomyDE138 papers
- University of ArizonaUS127 papers
- University of California, BerkeleyUS127 papers
- California Institute of TechnologyUS126 papers
- Carnegie ObservatoriesUS120 papers
- Carnegie Institution for ScienceUS113 papers
- Swinburne University of TechnologyAU107 papers
- European Southern ObservatoryCL103 papers
- Yale UniversityUS94 papers
33 papers · 2 filters
The WARPS Survey: VI. Galaxy Cluster and Source Identifications from Phase I
E. S. Perlman, D. J. Horner, L. R. Jones +4
We present in catalog form the optical identifications for objects from the first phase of the Wide Angle ROSAT Pointed Survey (WARPS). WARPS is a serendipitous survey of relativel…
Keck Spectroscopy of Young and Old Star Clusters in NGC 1023
Soeren S. Larsen, Jean P. Brodie
We present Keck/LRIS spectra for 11 old globular clusters in the S0-type galaxy NGC 1023 and 2 young blue clusters in the nearby companion NGC 1023A. Analysis of the spectra of 7 o…
The Aquarius Superclusters - I. Identification of Clusters and Superclusters
Cesar A. Caretta, Marcio A. G. Maia, Wataru Kawasaki +1
We study the distribution of galaxies and galaxy clusters in a 10^deg x 6^deg field in the Aquarius region. In addition to 63 clusters in the literature, we have found 39 new candi…
Keck Spectroscopy and Imaging of Faint Galaxies Identified as MicroJansky Radio Sources
Nathan Roche, James Lowenthal, David Koo
We investigate the nature of the faintest radio sources detected in 3 VLA surveys, to faint limits 8 microJy at 8.5 GHz. Using the Keck Low Resolution Imaging Spectrograph in BRI a…
Confrontation of Intracluster and Interstellar Gas in Cluster-Centered Elliptical Galaxies: M87 in Virgo and NGC 4874 in Coma
Fabrizio Brighenti, William G. Mathews
X-ray observations of M87 in the Virgo cluster and NGC 4874 in Coma reveal that the gas temperature beyond about 50 kpc from these cD galaxies is comparable to the virial temperatu…
Interpreting the Morphology of Diffuse Light Around Satellite Galaxies
Kathryn V. Johnston, Philip I. Choi, Puragra Guhathakurta
Recent observations of surface brightness distributions of both Milky Way and M31 satellite galaxies have revealed many instances of sudden changes or breaks in the slope of the su…
Tidal Interaction of M32 and NGC 205 with M31: Surface Photometry and Numerical Simulations
Philip I. Choi, Puragra Guhathakurta, Kathryn V. Johnston
We investigate the interaction history of the M31 sub-group of galaxies by comparing surface photometry of its two nearest satellites, M32 and NGC 205, with N-body simulations of s…
Hubble Space Telescope imaging of a peculiar stellar complex in NGC 6946
S. S. Larsen, Yu. N. Efremov, B. G. Elmegreen +4
The stellar populations in a stellar complex in NGC 6946 are analyzed on images taken with the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. The complex is pec…
Are dwarf spheroidal galaxies dark matter dominated or remnants of disrupted larger satellite galaxies? -- A possible test
Ralf Klessen, HongSheng Zhao
The failure of standard cosmolocical models in accounting for the statistics of dwarf satellites and the rotation curve of gas-rich dwarf galaxies in detail has led us to examine w…
The Main Sequence Luminosity Function of Palomar 5 from HST
Carl J. Grillmair, Graeme H. Smith
A low mass, large core radius, and strong tidal tails suggest that the globular cluster Palomar 5 has lost a large fraction of its initial mass over time. If the dynamical evolutio…
A new galaxy near the Local Group in Draco
I. D. Karachentsev, M. E. Sharina, A. E. Dolphin +7
We present HST WFPC2 and ground-based images of the low surface brightness dwarf Irr/Sph galaxy KKR~25 in Draco. Its colour-magnitude diagram shows red giant branch stars with the…
Rotational Studies of Late-Type Stars. VII. M34 (NGC 1039) and the Evolution of Angular Momentum and Activity in Young Solar-Type Stars
David R. Soderblom, Burton F. Jones, Debra Fischer
We analyze Keck Hires observations of rotation in F, G, and K dwarf members of the open cluster M34 (NGC 1039), which is 250 Myr old, and we compare them to the Pleiades, Hyades, a…
Population Synthesis in the Blue II. The Spectroscopic Age of 47 Tucanae
Ricardo P. Schiavon, S. M. Faber, James A. Rose +1
We develop a new set of models for intermediate-metallicity single stellar populations in the blue/optical region and use those models to determine the spectroscopic age of 47 Tuc.…
Population Synthesis in the Blue I. Synthesis of the Integrated Spectrum of 47 Tucanae from its Color-Magnitude Diagram
Ricardo P. Schiavon, S. M. Faber, Bruno V. Castilho +1
We perform an empirical synthesis of the blue integrated spectrum of the metal-rich globular cluster 47 Tucanae, based directly on the color-magnitude diagram of the cluster couple…
DDO Photometry of M71: Carbon and Nitrogen Patterns Among Evolving Giants
M. M. Briley, G. H. Smith, C. F. Claver
We present V, B-V, and DDO C(41-42) and C(42-45) photometry for a sample of 75 red giants down to M_V = +2 in the relatively metal-rich Galactic globular cluster M71. The C(41-42)…
High-Redshift Superwinds as the Source of the Strongest Mg II Absorbers: A Feasibility Analysis
N. A. Bond, C. W. Churchill, J. C. Charlton +1
We present HIRES/Keck profiles of four extremely strong (W_r > 1.8 A) Mg II absorbers at 1 < z < 2. The profiles display a common kinematic structure, having a sharp drop in optica…
Membership of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553
P. Coelho, B. Barbuy, M. -N. Perrin +4
Low resolution spectra of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553 are analysed. Radial velocities and atmospheric parameters are derived in order to chec…
HST photometry of Globular Clusters in the Sombrero Galaxy
Soeren S. Larsen, Duncan A. Forbes, Jean P. Brodie
We explore the rich globular cluster (GC) system of the nearby Sa galaxy M104, the "Sombrero" (NGC 4594), using archive WFPC2 data. The GC colour distribution is found to be bimoda…
A G1-like globular cluster in NGC 1023
Soeren S. Larsen
The structure of a very bright (MV = -10.9) globular cluster in NGC 1023 is analyzed on two sets of images taken with the Hubble Space Telescope. From careful modeling of King prof…
Keck Spectroscopy of Dwarf Elliptical Galaxies in the Virgo Cluster
M. Geha, P. Guhathakurta, R. van der Marel
Keck spectroscopy is presented for four dwarf elliptical galaxies in the Virgo Cluster. At this distance, the mean velocity and velocity dispersion are well resolved as a function…
Globular Cluster Subpopulations in Early-Type Galaxies: Insights into Galaxy Formation
Jean P. Brodie
New and archival HST images of the globular cluster systems of 17 relatively nearby galaxies and 6 more distant galaxies have been used to establish the characteristics of GC subpo…
Mass Spectra from Turbulent Fragmentation
Ralf Klessen
Turbulent fragmentation determines where and when protostellar cores form, and how they contract and grow in mass from the surrounding cloud material. Molecular cloud regions witho…
WFPC2 Observations of Two dSph Galaxies in the M81 Group
I. D. Karachentsev, M. E. Sharina, A. E. Dolphin +6
We have obtained HST WFPC2 and ground-based images of two low surface brightness dwarf spheroidal galaxies in the M81 group, FM1 and KKH57. Their colour-magnitude diagrams show red…
The Kinematics of Intermediate Redshift Mg II Absorbers
Chris Churchill, Steven S. Vogt
[Abridged] We present 23 quasar absorption line systems selected by the MgII doublet with W_r(2796)>0.3 Ang over the redshift range 0.4<z<1.2. The kinematics are studied at ~6 km/s…