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81 papers · 1 filter
A wide field survey of the distant rich cluster CL0024+1654
T. Treu, R. Ellis, P. Trivedi +5
We describe the first results from a comprehensive study of the distant cluster Cl0024+1654 (z=0.39) based upon a pattern of 38 mosaiced HST-WFPC2 images extending to radii ~5Mpc.…
Rapid Formation of Ice Giant Planets
Alan P. Boss, George W. Wetherill, Nader Haghighipour
The existence of Uranus and Neptune presents severe difficulties for the core accretion model for the formation of ice giant planets. We suggest an alternative mechanism, namely di…
The First Detections of the Extragalactic Background Light at 3000, 5500, and 8000A (II): Measurement of Foreground Zodiacal Light
R. A. Bernstein, W. L. Freedman, B. F. Madore
We present a measurement of the absolute surface brightness of the zodiacal light (3900-5100A) toward a fixed extragalactic target at high ecliptic latitude based on moderate resol…
The First Detections of the Extragalactic Background Light at 3000, 5500, and 8000A (III): Cosmological Implications
R. A. Bernstein, W. L. Freedman, B. F. Madore
(Abridged) We have used HST WFPC2 and ground-based spectroscopy to measure the integrated extragalactic background light (EBL) at optical wavelengths. We have also computed the int…
The First Detections of the Extragalactic Background Light at 3000, 5500, and 8000A (I): Results
R. A. Bernstein, W. L. Freedman, B. F. Madore
(Abridged) We present the first detections of the mean flux of the optical extragalactic background light (EBL) at 3000, 5500, and 8000A. Diffuse foreground flux at these wavelengt…
An HST Census of Nuclear Star Clusters in Late-Type Spiral Galaxies: I. Observations and Image Analysis
Torsten Boeker, Seppo Laine, Roeland P. van der Marel +4
We present new HST I-band images of a sample of 77 nearby, late-type spiral galaxies with low inclination. The main purpose of this catalog is to study the frequency and properties…