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4 papers · 1 filter
The Weak Blue Bump of H2106-099 and AGN De-Reddening
B. Grossan, R. A. Remillard, H. V. Bradt +3
We present multi-frequency spectra of the Seyfert 1 galaxy H2106-099, from radio to hard X-rays, spanning over a decade of observations. The hard X-ray (2-20 keV) spectrum measured…
Compact Group Selection From Redshift Surveys
Elizabeth Barton, Margaret J. Geller, Massimo Ramella +2
For the first time, we construct a catalog of compact groups selected from a complete, magnitude-limited redshift survey. We select groups with members based on projecte…
ROSAT Soft X-Ray Properties of the Large Bright Quasar Survey: Modeling of Stacked X-Ray Spectra
Norbert Schartel, Paul J. Green, Scott F. Anderson +6
We develop and apply a novel method of analysis to study the X-ray spectral properties of 908 QSOs in the Large Bright Quasar Survey (LBQS) that were observed during the soft X-ray…
Deep radio observation of the gravitational lens candidate QSO2345+007
Alok R. Patnaik, Peter Schneider, Ramesh Narayan
The double QSO2345+007 comprises two optical components separated by 7.1\ arcseconds and is the most prominent `dark matter' gravitational lens candidate. Despite being known for m…