19.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Kitt Peak National ObservatoryUS401 papers
- Cerro Tololo Inter-American ObservatoryCL274 papers
- U.S. National Science FoundationUS162 papers
- Space Telescope Science InstituteUS159 papers
- California Institute of TechnologyUS116 papers
- University of ArizonaUS99 papers
- Center for Astrophysics Harvard & SmithsonianUS80 papers
- Johns Hopkins UniversityUS71 papers
- University of California, BerkeleyUS58 papers
- University of Wisconsin–MadisonUS58 papers
- Carnegie ObservatoriesUS57 papers
- Goddard Space Flight CenterUS56 papers
50 papers · 2 filters
Detection of Pre-Shock Dense Circumstellar Material of SN 1978K
You-Hua Chu, Adeline Caulet, Marcos Montes +3
The supernova SN 1978K has been noted for its lack of emission lines broader than a few thousand km/s since its discovery in 1990. Modeling of the radio spectrum of the peculiar SN…
Magellanic Cloud X-ray Sources: III. Completion of a ROSAT Survey
P. C. Schmidtke, A. P. Cowley, J. D. Crane +4
This paper concludes a series of three papers presenting ROSAT High-Resolution Imager (HRI) observations of unidentified Einstein and serendipitous ROSAT X-ray sources in the direc…
Rotation periods of late-type stars in the young open cluster IC 2602
Sydney A. Barnes, Sabatino Sofia, Charles F. Prosser +1
We present the results of a monitoring campaign aimed at deriving rotation periods for a representative sample of stars in the young (30 Myr) open cluster IC 2602. Rotation periods…
Chemical Abundances of Planetary Nebulae in the Bulge and Disk of M31
George H. Jacoby, Robin Ciardullo
We derive abundances and central star parameters for 15 planetary nebulae (PNe) in M31: 12 in the bulge and 3 in a disk field 14 kpc from the nucleus. No single abundance value cha…
The Statistical Approach to Quantifying Galaxy Evolution
R. J. Brunner, A. J. Connolly, A. S. Szalay
Studies of the distribution and evolution of galaxies are of fundamental importance to modern cosmology; these studies, however, are hampered by the complexity of the competing eff…
Physical Structure of Small Wolf-Rayet Ring Nebulae
You-Hua Chu, Kerstin Weis, Donald R. Garnett
We have selected the seven most well-defined WR ring nebulae in the LMC (Br 2, Br 10, Br 13, Br 40a, Br 48, Br 52, and Br 100) to study their physical nature and evolutionary stage…
The Post-Common Envelope and Pre-Cataclysmic Binary PG 1224+309
Jerome A. Orosz, Richard A. Wade, Jason J. B. Harlow +3
We have made extensive spectroscopic and photometric observations of PG 1224+309, a close binary containing a DA white dwarf primary and an M4+ secondary. The H alpha line is in em…
A Deep Survey of HI-Selected Galaxies: The Sample and the Data
John G. Spitzak, Stephen E. Schneider
In a 21 cm neutral hydrogen survey of approximately 55 sq deg out to a redshift of cz=8340 km/s, we have identified 75 extragalactic HI sources. These objects comprise a well-defin…
Compact Nuclei in Galaxies at Moderate Redshift:II. Their Nature and Implications for the AGN Luminosity Function
Vicki L. Sarajedini, Richard F. Green, Richard E. Griffiths +1
This study explores the space density and properties of active galaxies to z=0.8. We have investigated the frequency and nature of unresolved nuclei in galaxies at moderate redshif…
Compact Nuclei in Galaxies at Moderate Redshift: I. Imaging and Spectroscopy
Vicki L. Sarajedini, Richard F. Green, Richard E. Griffiths +1
This study explores the space density and properties of active galaxies to z=0.8. We have investigated the frequency and nature of unresolved nuclei in galaxies at moderate redshif…
Optical Light Curve of the Type Ia Supernova 1998bu in M96 and the Supernova Calibration of the Hubble Constant
Nicholas B. Suntzeff, M. M. Phillips, R. Covarrubias +15
We present the UBVRI light curves of the Type Ia supernova SN 1998bu which appeared in the nearby galaxy M96 (NGC 3368). M96 is a spiral galaxy in the Leo I group which has a Cephe…
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 stellar populations of spiral disks.II Measuring and modeling the radial distribution of absorption spectral indices
M. Molla, E. Hardy, D. Beauchamp
The radial distributions of the Mg2 and Fe5270 Lick spectral indices have been measured to large radial distances on the disks of NGC 4303 and NGC 4535 using an imaging technique b…
The Universality of the Fundamental Plane of E and S0 Galaxies. Sample Definition and I Band Photometric Data
M. Scodeggio, R. Giovanelli, M. P. Haynes
As part of a project to compare the Fundamental Plane and Tully-Fisher distance-scales, we present here I band CCD photometry for 636 early-type galaxies in 8 clusters and groups o…
Correlation Between Gas and Dust in Molecular Clouds: L977
J. Alves, C. Lada, E. Lada
We report observations of the J =(1--0) C18O molecular emission line toward the L977 molecular cloud. To study the correlation between C18O emission and dust extinction we construc…
Structure and Kinematics of the Interstellar Medium in front of SN1987A
J. Xu, A. P. S. Crotts
High resolution (10 km/s) [N II] echelle spectra, sampled every 13 arcsec in a 6 arcmin by 6 arcmin region around SN1987A were obtained on the CTIO 4m telescope. The map shows a co…
A Cluster or Filament of Galaxies at Redshift Z=2.5
Ana Campos, Amos Yahil, Rogier A. Windhorst +4
We report the discovery of 56 new Lyman-alpha-emitting candidates (LECs) at redshift z=2.5 in a field of 8'x14' around two previously known weak radio QSOs and a cosmic microwave b…
Near-Infrared Classification Spectroscopy: H-band Spectra of Fundamental MK Standards
Michael R. Meyer, Suzan Edwards, Kenneth H. Hinkle +1
We present a catalogue of H-band spectra for 85 stars of approximately solar abundance observed at a resolving power of 3000 with the KPNO Mayall 4m FTS. The atlas covers spectral…
WFPC2 Observations of Star Clusters in the Magellanic Clouds. II. The Oldest Star Clusters in the Small Magellanic Cloud
Kenneth J. Mighell, Ata Sarajedini, Rica S. French
We present our analysis of archival Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) observations in F450W (~B) and F555W (~V) of the intermediate- age populous star cl…
Recent Star Formation in Sextans A
Schuyler D. Van Dyk, Daniel Puche, Tony Wong
We investigate the relationship between the spatial distributions of stellar populations and of neutral and ionized gas in the Local Group dwarf irregular galaxy Sextans A. This ga…
The Infrared Surface Brightness Fluctuation Distances to the Hydra and Coma Clusters
Joseph B. Jensen, John L. Tonry, Gerard A. Luppino
We present IR surface brightness fluctuation (SBF) distance measurements to NGC 4889 in the Coma cluster and to NGC 3309 and NGC 3311 in the Hydra cluster. We explicitly corrected…
A Photometric Method for Quantifying Asymmetries in Disk Galaxies
David A. Kornreich, Martha P. Haynes, Richard V. E. Lovelace
A photometric method for quantifying deviations from axisymmetry in optical images of disk galaxies is applied to a sample of 32 face-on and nearly face-on spirals. The method invo…
A Survey for Low-Surface-Brightness Galaxies Around M31. I. The Newly Discovered Dwarf Andromeda V
Taft E. Armandroff, James E. Davies, George H. Jacoby
We present images and a color-magnitude diagram for And V, a new dwarf spheroidal companion to M31 that was found using a digital filtering technique applied to 1550 square degrees…
The Infrared Luminosity Function of Galaxies in the Coma Cluster
Roberto De Propris, Peter R. Eisenhardt, Adam Stanford +1
An infrared survey of the central 650 arcmin of the Coma cluster is used to determine the band luminosity function for the cluster. Redshifts are available for all galaxies…