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
36 papers · 2 filters
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…
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…
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…
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…
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…
The ROTSE-III Robotic Telescope System
C. W. Akerlof, M. C. B. Ashley, D. E. Casperson +12
The observation of a prompt optical flash from GRB990123 convincingly demonstrated the value of autonomous robotic telescope systems. Pursuing a program of rapid follow-up observat…
Tidal dwarfs in the M81 group: the second generation?
L. N. Makarova, E. K. Grebel, I. D. Karachentsev +8
We derive quantitative star formation histories of the four suspected tidal dwarf galaxies in the M81 group, HolmbergIX, BK3N, Arp-loop (A0952+69), and Garland, using Hubble Space…
Axisymmetric Dynamical Models of the Central Regions of Galaxies
Karl Gebhardt, Douglas Richstone, Scott Tremaine +12
We present axisymmetric, orbit superposition models for 12 galaxies using data taken with the Hubble Space Telescope (HST) and ground-based observatories. In each galaxy, we detect…
Models of the formation of the planets in the 47 UMa system
Kacper Kornet, Peter Bodenheimer, Michal Rozyczka
Formation of planets in the 47 UMa system is followed in an evolving protoplanetary disk composed of gas and solids. The evolution of the disk is calculated from an early stage, wh…
Variability-Selected Quasars in MACHO Project Magellanic Cloud Fields
M. Geha, C. Alcock, R. A. Allsman +22
We present 47 spectroscopically-confirmed quasars discovered behind the Magellanic Clouds identified via photometric variability in the MACHO database. Thirty-eight quasars lie beh…
Science Objectives and Early Results of the DEEP2 Redshift Survey
Marc Davis, Sandra M. Faber, Jeffrey A. Newman +18
The DEIMOS spectrograph has now been installed on the Keck-II telescope and commissioning is nearly complete. The DEEP2 Redshift Survey, which will take approximately 120 nights at…
Radial Flow of Dust Particles in Accretion Disks
Taku Takeuchi, D. N. C. Lin
We study the radial migration of dust particles in accreting protostellar disks analogous to the primordial solar nebula. This study takes account of the two dimensional (radial an…
The Morphology of 9 Radio-selected Faint Galaxies from deep HST Imaging
Nathan Roche, James Lowenthal, David Koo
Using the HST WFPC2 we perform deep I-band imaging of 9 radio-selected (limit 14 microJanskys at 8.5 GHz) faint galaxies from Roche, Lowenthal and Koo (2002). Two are also observed…
Structural Parameters and Dynamical Masses for Globular Clusters in M33
S. S. Larsen, J. P. Brodie, A. Sarajedini +1
Using high-dispersion spectra from the HIRES echelle spectrograph on the Keck I telescope, we measure velocity dispersions for 4 globular clusters in M33. Combining the velocity di…
The Type Ia Supernova 1999aw: a Probable 1999aa-like Event In a Low-Luminosity Host Galaxy
L. -G. Strolger, R. C. Smith, N. B. Suntzeff +39
SN 1999aw was discovered during the first campaign of the Nearby Galaxies Supernova Search (NGSS) project. This luminous, slow-declining (Delta m_{15} (B) = 0.81 \pm 0.03) Type Ia…
Characterizing the Adaptive Optics Off-Axis Point-Spread Function - I: A Semi-Empirical Method for Use in Natural-Guide-Star Observations
E. Steinbring, S. M. Faber, S. Hinkley +11
Even though the technology of adaptive optics (AO) is rapidly maturing, calibration of the resulting images remains a major challenge. The AO point-spread function (PSF) changes qu…
An Improved uvby-Metallicity Calibration for Metal-Rich Stars
Sarah Martell, Gregory Laughlin
We present an improved uvby-metallicity relation calibrated for F, G, and early K dwarfs, and an analogous uvby-T(eff) relation, both derived using a Levenberg-Marquardt minimizati…