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Cosmology from Type Ia Supernovae
S. Perlmutter, G. Aldering, S. Deustua +25
This presentation reports on first evidence for a low-mass-density/positive-cosmological-constant universe that will expand forever, based on observations of a set of 40 high-redsh…
ESO Imaging Survey IV. Exploring the EIS Multicolor Data
S. Zaggia, I. Hook, R. Mendez +14
This paper presents preliminary lists of potentially interesting point-like sources extracted from multicolor data obtained for a 1.7 square degree region near the South Galactic P…
A Search for High-redshift Quasars Among GB/FIRST Flat-Spectrum Radio Sources
I. M. Hook, R. H. Becker, R. G. McMahon +1
We present the method and first results of a survey for high-redshift (z>3) radio-loud quasars, which is based on optical identifications of 2902 flat-spectrum radio sources with S…
The ESO Imaging Survey: Status Report and Preliminary Results
L. da Costa, E. Bertin, E. Deul +17
The ESO Imaging Survey (EIS) presented in early issues of the Messenger, and with up-to-date information on the ongoing observations available on the Web (http://www.eso.org/eis),…
The ASCA spectrum of the z=4.72 blazar, GB 1428+4217
A. C. Fabian, K. Iwasawa, A. Celotti +3
The X-ray luminous quasar GB 1428+4217 at redshift 4.72 has been observed with ASCA. The observed 0.5-10 keV flux is 3.2E-12 erg/s/cm2. We report here on the intrinsic 4-57 keV X-r…
The Evolution of Radio-loud Quasars at High Redshift
I. M. Hook, P. A. Shaver, R. G. McMahon
We present results from two surveys for radio-loud quasars. These are (1) a northern survey reaching S(5GHz)=0.2Jy and (2) the Parkes QSO survey reaching S(2.7GHz)=0.25Jy, which to…