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
69 papers · 2 filters
Active star formation in N11B Nebula in the Large Magellanic Cloud: a sequential star formation scenario confirmed
Rodolfo H. Barba, Monica Rubio, Miguel R. Roth +1
The second largest HII region in the Large Magellanic Cloud, N11B has been surveyed in the near IR.We present JHKs images of the N11B nebula.These images are combined with CO(1-0)…
Radio-selected Galaxies in Very Rich Clusters at z < 0.25: I. Multi-wavelength Observations and Data Reduction Techniques
G. E. Morrison, F. N. Owen, M. J. Ledlow +4
Radio observations were used to detect the `active' galaxy population within rich clusters of galaxies in a non-biased manner that is not plagued by dust extinction or the K-correc…
Discovery of a High-Redshift (z=0.96) Cluster of Galaxies Using a FIRST Wide-Angle Tailed Radio Source
Elizabeth L. Blanton, Michael D. Gregg, David J. Helfand +2
Using a combination of near-infrared and optical photometry, along with multi-object spectroscopy, we have confirmed the existence of a high-redshift cluster of galxies at z = 0.96…
uvbyCaHbeta CCD Photometry of Clusters. III. The Most Metal-Rich Open Cluster, NGC 6253
B. A. Twarog, B. J. Anthony-Twarog, N. De Lee
CCD photometry on the intermediate-band uvbyCaH-beta system is presented for the old open cluster, NGC 6253. Despite a high level of field star contamination due to its location to…
Weak Lensing Results from the 75 Square Degree CTIO Survey
M. Jarvis, G. Bernstein, B. Jain +4
We measure seeing-corrected ellipticities for 2 x 10^6 galaxies with magnitude R<23 in 12 widely separated fields totalling 75 deg^2 of sky. At angular scales >30\arcmin, elliptici…
Superhumps in Cataclysmic Binaries. XXIII. V442 Ophiuchi and RX J1643.7+3402
Joseph Patterson, William Fenton, John Thorstensen +15
We report the results of long observing campaigns on two novalike variables: V442 Ophiuchi and RX J1643.7+3402. These stars have high-excitation spectra, complex line profiles sign…
Massive Ellipticals at High Redshift: NICMOS Imaging of Z~1 Radio Galaxies
A. W. Zirm, M. Dickinson, A. Dey
We present deep, continuum images of eleven high-redshift (0.811 < z < 1.875) 3CR radio galaxies observed with NICMOS. Our images probe the rest-frame optical light where stars are…
ISM Abundances in Sculptor Group Dwarf Irregular Galaxies
Evan D. Skillman, Stephanie Cote, Bryan W. Miller
Using the CTIO 4-m telescope, we have obtained optical spectra of HII regions in five Sculptor Group dwarf irregular galaxies. We derive oxygen, nitrogen, and sulfur abundances fro…
The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-time-scale variability
D. Bersier, K. Z. Stanek, J. Winn +11
We report UBVRI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (10-20%) deviations from a power law decay on several time scales,…
Optical and Infrared Photometry of the Nearby Type Ia Supernova 2001el
Kevin Krisciunas, Nicholas B. Suntzeff, Pablo Candia +8
We present well sampled optical (UBVRI) and infrared (JHK) light curves of the nearby (~18.0 Mpc) Type Ia supernova SN 2001el, from 11 days before to 142 days after the time of B-b…
The Ringed Spiral Galaxy NGC 4622. I. Photometry, Kinematics, and the Case for Two Strong Leading Outer Spiral Arms
Ronald J. Buta, Gene G. Byrd, Tarsh Freeman
The intriguing nearly face-on southern ringed spiral galaxy NGC 4622, the first galaxy definitively shown to have leading spiral structure, is revisited in this paper with new imag…
Spectroscopic Confirmation of Three Redshift 5.7 Lyman-alpha Emitters from the Large Area Lyman Alpha Survey
James E. Rhoads, Arjun Dey, Sangeeta Malhotra +5
Narrow-band searches for Lyman alpha emission are an efficient way of identifying star-forming galaxies at high redshifts. We present Keck telescope spectra confirming redshifts z…
Confirmation of SBS 1150+599A As An Extremely Metal-Poor Planetary Nebula
George Jacoby, John Feldmeier, Charles F. Claver +4
SBS 1150+599A is a blue stellar object at high galactic latitude discovered in the Second Byurakan Survey. New high-resolution images of SBS 1150+599A are presented, demonstrating…
The BTC40 Survey for Quasars at 4.8 < z < 6
E. M. Monier, J. D. Kennefick, P. B. Hall +4
The BTC40 Survey for high-redshift quasars is a multicolor search using images obtained with the Big Throughput Camera (BTC) on the CTIO 4-m telescope in V, I, and z filters to sea…
A Young Blue Tidal Stream in NGC 5128
Eric W. Peng, Holland C. Ford, Kenneth C. Freeman +1
Stellar streams in galaxy halos are the natural consequence of a history of merging and accretion. We present evidence for a blue tidal stream of young stars in the nearest giant e…
Structure of Disk Dominated Galaxies I. Bulge/Disk Parameters, Simulations, and Secular Evolution
Lauren A. MacArthur, Stephane Courteau, Jon A. Holtzman
(Abridged) A robust analysis of galaxy structural parameters, based on the modeling of bulge and disk brightnesses in the BVRH bandpasses, is presented for 121 face-on and moderate…
A Simple Prediction on the Surface Density of Galaxies at z ~ 6
Haojing Yan, Rogier A. Windhorst, Stephen C. Odewahn +3
Systematic surveys are being proposed to discover a significant number of galaxies at z ~ 6, which is now suggested as the epoch when the reionization era of the Universe ends. To…
The Diversity of Extremely Red Objects
Ian Smail, F. N. Owen, G. E. Morrison +3
We present a multi-wavelength study of Extremely Red Objects (EROs) employing deep RIzJHK photometry of a 8.5'x8.5' region to identify 68 EROs with R-K>5.3 and K<20.5 (5-sigma). Th…
Molecular Gas and Star Formation in Bars of Nearby Spiral Galaxies
Kartik Sheth, Stuart N. Vogel, Michael W. Regan +3
We compare the distribution of molecular gas and star formation activity in the bar region of six spirals (NGC 2903, NGC 3627, NGC 4321, NGC 5457, NGC 6946, & IC 342) from the BIMA…
Evolution of Star Forming and Active Galaxies in Nearby Clusters
Neal A. Miller, Frazer N. Owen
(Abridged) We have used optical spectroscopy to investigate the radio- selected active galaxy populations in a sample of 20 nearby Abell clusters. The spectra were used to characte…
A New Orbital Ephemeris and Reinterpretation of Spectroscopic Data for the Supersoft X-ray Binary RX J0513.9-6951
A. P. Cowley, P. C. Schmidtke, D. Crampton +1
We have analyzed nearly eight years of MACHO optical photometry of the supersoft X-ray binary RX J0513.9-6951 and derived a revised orbital period and ephemeris. Previously publish…
K-Band Red Clump Distances to the LMC Clusters Hodge 4 and NGC 1651
Ata Sarajedini, Aaron J. Grocholski, Joanna Levine +1
We present near-infrared color-magnitude diagrams for the LMC star clusters Hodge 4 and NGC 1651 revealing the helium burning red clump stars for the first time in the JK passbands…
The Stellar and Gas Kinematics of Several Irregular Galaxies
Deidre A. Hunter, Vera C. Rubin, Rob A. Swaters +2
We present long-slit spectra of three irregular galaxies from which we determinethe stellar kinematics in two of the galaxies (NGC 1156 and NGC 4449) and ionized-gas kinematics in…
Carbon Isotopic Abundances in the Red Giants of Omega Centauri (NGC5139)
Verne V. Smith, Donald M. Terndrup, Nicholas B. Suntzeff
Carbon-12 and carbon-13 abundances are measured in eleven red-giant members of the globular cluster Omega Centauri via observations of first-overtone CO bands near 2.3 microns. The…