Information about Third Cambridge Catalogue Of Radio Sources
| 3C | |
| Organization: | Radio Astronomy Group, University of Cambridge |
|---|---|
| Wavelength: | 159-MHz radio |
| Data source: | Mullard Radio Astronomy Observatory |
| Goals: | First detailed survey of radio sources |
| Data products: | 3C Catalogue |
| Website(s): | The 3C and 3CR Catalogues |
The catalogue was subsequently revised by Bennett in 1962 using observations at 178 MHz, and for many years '3CR' was considered as the definitive listing of the brighter radio sources in the Northern Hemisphere. The revision resulted in a number of sources being deleted from the catalogue (as being below the flux limit of 9 Jy or as now-resolved blends of adjacent sources) and others being added. To avoid renumbering the existing sources (which were listed in RA order) these new sources were added using a decimal extension. Eg 3C 323.1 follows 3C 323 in Right Ascension and precedes 3C 324.
A further revision by Laing, Riley and Longair in 1983, called 3CRR or 3CR², included galaxies which were not detected in the original catalogue due to shortcomings of the original observations, but which otherwise meet the flux and declination limits. This new catalogue, which includes all extragalactic radio sources with 178-MHz flux density > 10.9 Jy (on the scale of Baars et al), declination greater than 10 degrees, and Galactic latitude greater than 10 degrees or less than -10 degrees, is formally a complete sample of radio galaxies and radio loud quasars. It excludes a number of well known 3C/3CR objects, including, of course, all the supernova remnants from 3C, but also some well-known radio galaxies that fall foul of the declination, flux density or galactic latitude constraints. Objects that had been discovered to consist of multiple components associated with different objects were given an alphabetical suffix (A, B...) to make it clear which component was part of the sample: e.g. the radio galaxy 3C 66B is part of the sample, but the BL Lac object 3C 66A is not.
See also
External links
References
- Edge, D. O., Shakeshaft, J. R., McAdam, W. B., Baldwin, J. E., & Archer, S. 1959, Mem. R. Astron. Soc., 68, 37, 'A survey of radio sources at a frequency of 159 Mc/s'
- Bennett A. S., 1962, MNRAS, 125, 75-86
- Laing R.A., Riley J.M., Longair M.S., 1983, MNRAS, 204, 151
The Cavendish Astrophysics Group (formerly the Radio Astronomy Group) is based at the Cavendish Laboratory at the University of Cambridge. The group operates all of the telescopes at the Mullard Radio Astronomy Observatory except for the 32m MERLIN telescope, which is operated by
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University of Cambridge (often Cambridge University), located in Cambridge, England, is the second-oldest university in the English-speaking world and has a reputation as one of the world's most prestigious universities.
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In physics, wavelength is the distance between repeating units of a propagating wave of a given frequency. It is commonly designated by the Greek letter lambda (λ). Examples of wave-like phenonomena are light, water waves, and sound waves.
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Mullard Radio Astronomy Observatory (MRAO) is home to a number of large aperture synthesis radio telescopes, including the One-Mile Telescope, 5-km Ryle Telescope, and the Arcminute Microkelvin Imager.
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An astronomical catalog or catalogue is a list or tabulation of astronomical objects, typically grouped together because they share a common type, morphology, origin, means of detection, or method of discovery.
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20th century - 21st century
1920s 1930s 1940s - 1950s - 1960s 1970s 1980s
1956 1957 1958 - 1959 - 1960 1961 1962
Year 1959 (MCMLIX
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1920s 1930s 1940s - 1950s - 1960s 1970s 1980s
1956 1957 1958 - 1959 - 1960 1961 1962
Year 1959 (MCMLIX
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The Cavendish Astrophysics Group (formerly the Radio Astronomy Group) is based at the Cavendish Laboratory at the University of Cambridge. The group operates all of the telescopes at the Mullard Radio Astronomy Observatory except for the 32m MERLIN telescope, which is operated by
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University of Cambridge (often Cambridge University), located in Cambridge, England, is the second-oldest university in the English-speaking world and has a reputation as one of the world's most prestigious universities.
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3C 273 is a quasar located in the constellation Virgo.
It is the optically-brightest quasar in our sky (m ~ 12.9), and one of the closest with a redshift, z, of 0.158.[2] A luminosity distance of DL = 2.
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It is the optically-brightest quasar in our sky (m ~ 12.9), and one of the closest with a redshift, z, of 0.158.[2] A luminosity distance of DL = 2.
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The Cambridge Interferometer was a radio telescope interferometer built by Martin Ryle and Antony Hewish in the early 1950s to the west of Cambridge (between the Grange Road football ground and the current Cavendish Laboratory).
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Cambridge is an old English university town and the administrative centre of the county of Cambridgeshire. It lies approximately 50 miles (80 km) north-northeast of London and is surrounded by a number of smaller towns and villages.
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2C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 81.5 MHz radio
Data source: Cambridge Interferometer
Data products: 2C Catalogue The Second Cambridge Catalogue of Radio Sources (2C)
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 81.5 MHz radio
Data source: Cambridge Interferometer
Data products: 2C Catalogue The Second Cambridge Catalogue of Radio Sources (2C)
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For other uses, see Jansky (disambiguation).
The flux density or monochromatic flux, , of a source is the integral of the spectral radiance, , over the source solid angle:
In radio astronomy, the flux unit or jansky (symbol Jy
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The flux density or monochromatic flux, , of a source is the integral of the spectral radiance, , over the source solid angle:
In radio astronomy, the flux unit or jansky (symbol Jy
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Right ascension (abbrev. RA; symbol α) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.
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Julia M Riley, a Fellow of Girton College, works at the Cavendish Astrophysics Group, University of Cambridge in the area of radio astronomy. In 1974, along with Fanaroff, she wrote a famous paper classifying radio galaxies into two types based on their morphology (shape).
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Malcolm Sim Longair FRS is the Jacksonian Professor of Natural Philosophy in the Cavendish Laboratory, Cambridge University, United Kingdom.
He was born on May 18, 1941, and educated at Morgan Academy, Dundee, Scotland.
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He was born on May 18, 1941, and educated at Morgan Academy, Dundee, Scotland.
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Radio galaxies and their relatives, radio-loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths (up to 1038 W between 10 MHz and 100 GHz). The radio emission is due to the synchrotron process.
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quasar (contraction of QUASi-stellAR radio source) is an extremely bright and distant active galactic nucleus. They were first identified as being high redshift sources of electromagnetic energy, including radio waves and visible light that were point-like, similar to stars,
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A BL Lac object, BL Lacertae object is a type of active galaxy with an active galactic nucleus (AGN) and is named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large amplitude flux variability
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1C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 3.7m radio
Data products: 1C Catalogue in journal (MNRAS)
The First Cambridge Catalogue of Radio Sources (1C) refers to the catalogue listed in the article
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 3.7m radio
Data products: 1C Catalogue in journal (MNRAS)
The First Cambridge Catalogue of Radio Sources (1C) refers to the catalogue listed in the article
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2C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 81.5 MHz radio
Data source: Cambridge Interferometer
Data products: 2C Catalogue The Second Cambridge Catalogue of Radio Sources (2C)
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 81.5 MHz radio
Data source: Cambridge Interferometer
Data products: 2C Catalogue The Second Cambridge Catalogue of Radio Sources (2C)
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4C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 178 MHz radio
Data source: 4C Array, Mullard Radio Astronomy Observatory
Goals: Deep survey of radio sources
Data products: 4C Catalogue
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 178 MHz radio
Data source: 4C Array, Mullard Radio Astronomy Observatory
Goals: Deep survey of radio sources
Data products: 4C Catalogue
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5C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 408-MHz and 1407-MHz radio
Data source: One-Mile Telescope, Mullard Radio Astronomy Observatory
Goals: Deep survey of radio sources
Data products: 5C Catalogue
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 408-MHz and 1407-MHz radio
Data source: One-Mile Telescope, Mullard Radio Astronomy Observatory
Goals: Deep survey of radio sources
Data products: 5C Catalogue
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6C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 151-MHz radio
Data source: CLFST, Mullard Radio Astronomy Observatory
Goals: Deep survey of radio sources
Data products: 6C Catalogue
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 151-MHz radio
Data source: CLFST, Mullard Radio Astronomy Observatory
Goals: Deep survey of radio sources
Data products: 6C Catalogue
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7C
Map of the Milky Way from the 7C(G) catalogue in the region: 140° to 180° galactic longitude; -5° to 5° galactic latitude
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 151 MHz radio
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Map of the Milky Way from the 7C(G) catalogue in the region: 140° to 180° galactic longitude; -5° to 5° galactic latitude
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 151 MHz radio
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8C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 38-MHz radio
Data source: Cambridge Low Frequency Synthesis Telescope, Mullard Radio Astronomy Observatory
Goals: Deep, low frequency survey of radio sources
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 38-MHz radio
Data source: Cambridge Low Frequency Synthesis Telescope, Mullard Radio Astronomy Observatory
Goals: Deep, low frequency survey of radio sources
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9C
Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 15-GHz radio
Data source: Ryle Telescope, Mullard Radio Astronomy Observatory
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Organization: Radio Astronomy Group, University of Cambridge
Wavelength: 15-GHz radio
Data source: Ryle Telescope, Mullard Radio Astronomy Observatory
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John Evan Baldwin has worked at the Cavendish Astrophysics Group (formerly Mullard Radio Astronomy Observatory) since 1954. He played a pivotal role in the development of interferometry in Radio Astronomy, and later astronomical optical interferometry and lucky imaging.
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