High-redshift radio galaxies from the Molonglo Catalogue
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 i...
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| Veröffentlicht in: | The Astronomical journal 1990-10, Vol.100, p.1014-1027 |
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| container_title | The Astronomical journal |
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| creator | McCarthy, P. J. Kapahi, V. K. van Breugel, W. Subrahmanya, C. R. |
| description | 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. (B.P.) |
| doi_str_mv | 10.1086/115575 |
| format | Article |
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J. ; Kapahi, V. K. ; van Breugel, W. ; Subrahmanya, C. R.</creator><creatorcontrib>McCarthy, P. J. ; Kapahi, V. K. ; van Breugel, W. ; Subrahmanya, C. R.</creatorcontrib><description>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. 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J.</creatorcontrib><creatorcontrib>Kapahi, V. K.</creatorcontrib><creatorcontrib>van Breugel, W.</creatorcontrib><creatorcontrib>Subrahmanya, C. R.</creatorcontrib><title>High-redshift radio galaxies from the Molonglo Catalogue</title><title>The Astronomical journal</title><description>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. 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J.</creatorcontrib><creatorcontrib>Kapahi, V. K.</creatorcontrib><creatorcontrib>van Breugel, W.</creatorcontrib><creatorcontrib>Subrahmanya, C. R.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>McCarthy, P. J.</au><au>Kapahi, V. K.</au><au>van Breugel, W.</au><au>Subrahmanya, C. R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>High-redshift radio galaxies from the Molonglo Catalogue</atitle><jtitle>The Astronomical journal</jtitle><date>1990-10-01</date><risdate>1990</risdate><volume>100</volume><spage>1014</spage><epage>1027</epage><pages>1014-1027</pages><issn>0004-6256</issn><eissn>1538-3881</eissn><abstract>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. 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| ispartof | The Astronomical journal, 1990-10, Vol.100, p.1014-1027 |
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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection |
| subjects | 640105 - Astrophysics & Cosmology- Galaxies ASTRONOMY CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS 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 |
| title | High-redshift radio galaxies from the Molonglo Catalogue |
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