High-redshift radio galaxies from the Molonglo Catalogue
- Mount Wilson and Las Campanas Observatories, Pasadena, CA (USA) Tata Institute of Fundamental Research, Poona (India) Lawrence Livermore National Laboratory, CA (USA)
Radio and optical observations of a sample of southern hemisphere radio galaxies, selected from the 408 MHz Molonglo Reference Catalogue, are discussed. The sample is defined by means of two criteria: flux densities greater than 0.9 Jy and low-frequency spectral indices steeper than -0.9. From the initial sample of 700 sources, 150 combine the best characteristics of the 1 Jy and ultrasteep samples. It is suggested that these sources can be used to find galaxies at large redshift and explore the properties of galaxies at extreme luminosities and early epochs. VLA 6 cm maps and optical identifications of 13 sources are presented. Eleven of the sources have extended optical structures with morphologies characteristic of high-redshift (z greater than 0.8) radio galaxies. 38 refs.
- OSTI ID:
- 6439704
- Journal Information:
- Astronomical Journal; (USA), Vol. 100; ISSN 0004-6256
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
RADIO GALAXIES
RADIOWAVE RADIATION
VISIBLE RADIATION
CATALOGS
FLUX DENSITY
GALACTIC EVOLUTION
LUMINOSITY
RADIOASTRONOMY
RED SHIFT
SPECTROSCOPY
ASTRONOMY
COSMIC RADIO SOURCES
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
GALAXIES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
640105* - Astrophysics & Cosmology- Galaxies