High-redshift radio galaxies from the Molonglo Catalogue

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115575· OSTI ID:6439704

Mccarthy, P J; Kapahi, V K; Subrahmanya, C R; Van Breugel, W ^[1]

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1. 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), Journal Name: Astronomical Journal; (USA) Vol. 100; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTRONOMY
CATALOGS
COSMIC RADIO SOURCES
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
FLUX DENSITY
GALACTIC EVOLUTION
GALAXIES
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIO GALAXIES
RADIOASTRONOMY
RADIOWAVE RADIATION
RED SHIFT
SPECTROSCOPY
VISIBLE RADIATION