Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..300b&link_type=abstract
NOAO Proposal ID #1999A-0300
Computer Science
Scientific paper
We wish to finish the spectroscopic survey of the Spring objects in a complete magnitude-limited (J <=18 and (delta) ≥ -20°) sample of galaxies which are both radio sources in the 1.4 GHz NRAO VLA Sky Survey (NVSS) and X-ray sources in the ROSAT All-Sky Survey Bright Source Catalog (BSC). This sample is unique in its size (N~900 galaxies and quasars), composition (a mixture of nearly normal galaxies, Seyferts, quasars, and clusters), and low average distance (< z> ~0.1). The spectra will allow us to derive redshifts and classify these relatively low-luminosity nearby galaxies as spiral or elliptical galaxies, Seyferts, quasars or BL Lac objects. They will permit us to estimate multivariate radio-X-ray-optical luminosity functions, and model evolutionary effects. IRAS data will help determine the dominant energy source (AGN, stars and stellar remnants, or hot gas). Using optical spectra, IRAS luminosities or limits, and high-resolution 4.5 & 8 GHz VLA data, we can test orientation-dependent "unified" models involving relativistic beaming and absorption by nuclear dust torii.
Bauer Franz
Condon James J.
Thuan Trinh Xuan
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