The Third Cambridge Catalogue of Radio Sources (3C) is an astronomical catalogue of celestial radio sources detected originally at 159 MHz, and subsequently at 178 MHz.
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. E.g. 3C 323.1 follows 3C 323 in Right Ascension and precedes 3C 324.
3CRRedit
A further revision by Laing, Julia Riley and Malcolm 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 revision includes all extragalactic radio sources in the Northern Hemisphere with 178-MHz flux density greater that 10.9 Janskys, declination greater than 10 degrees, and Galactic latitude greater than 10 degrees or less than -10 degrees. It excludes a number of well-known 3C/3CR objects, including all the supernova remnants from 3C, but also some well-known radio galaxies that lie outside 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 object3C 66A is not.
Referencesedit
Edge, DO; Shakeshaft, JR; McAdam, WB; Baldwin, JE; Archer, S (1959). "A survey of radio sources at a frequency of 159 Mc/s". Memoirs of the Royal Astronomical Society. 68: 37. Bibcode:1959MmRAS..68...37E.
Laing, RA; Riley, JM; Longair, MS (1983). "Bright radio sources at 178 MHz - Flux densities, optical identifications and the cosmological evolution of powerful radio galaxies". Monthly Notices of the Royal Astronomical Society. 204: 151. Bibcode:1983MNRAS.204..151L. doi:10.1093/mnras/204.1.151.
External linksedit
The Revised 3C Catalogue of Radio Sources on the internet.
The 3CRR catalogue on the internet.
January 01, 1970
third, cambridge, catalogue, radio, sources, astronomical, catalogue, celestial, radio, sources, detected, originally, subsequently, alternative, names3cwebsitevizier, harvard, vizier, source, viii, 2f1a, form, html, related, media, commons, edit, wikidata, th. The Third Cambridge Catalogue of Radio Sources 3C is an astronomical catalogue of celestial radio sources detected originally at 159 MHz and subsequently at 178 MHz Third Cambridge Catalogue of Radio SourcesAlternative names3CWebsitevizier wbr cfa wbr harvard wbr edu wbr viz bin wbr VizieR 3 source VIII 2F1A amp out wbr max 50 amp out wbr form HTML Related media on Commons edit on Wikidata This article includes a list of references related reading or external links but its sources remain unclear because it lacks inline citations Please help improve this article by introducing more precise citations May 2022 Learn how and when to remove this message Contents 1 History 1 1 3C 1 2 3CR 1 3 3CRR 2 References 3 External linksHistory edit3C edit The catalogue was published in 1959 by members of the Radio Astronomy Group of the University of Cambridge Entries in the catalogue are identified by the prefix 3C followed by the entry number with a space for example 3C 273 The number denotes objects in order of increasing right ascension The catalogue was produced using the Cambridge Interferometer on the west side of Cambridge The interferometer had previously been used for the Second Cambridge Catalogue of Radio Sources 2C survey published in 1955 3CR edit 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 E g 3C 323 1 follows 3C 323 in Right Ascension and precedes 3C 324 3CRR edit A further revision by Laing Julia Riley and Malcolm Longair in 1983 called 3CRR or 3CR 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 revision includes all extragalactic radio sources in the Northern Hemisphere with 178 MHz flux density greater that 10 9 Janskys declination greater than 10 degrees and Galactic latitude greater than 10 degrees or less than 10 degrees It excludes a number of well known 3C 3CR objects including all the supernova remnants from 3C but also some well known radio galaxies that lie outside 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 References editEdge DO Shakeshaft JR McAdam WB Baldwin JE Archer S 1959 A survey of radio sources at a frequency of 159 Mc s Memoirs of the Royal Astronomical Society 68 37 Bibcode 1959MmRAS 68 37E Bennett AS 1962 The preparation of the revised 3C catalogue of radio sources Monthly Notices of the Royal Astronomical Society 125 75 Bibcode 1962MNRAS 125 75B doi 10 1093 mnras 125 1 75 Laing RA Riley JM Longair MS 1983 Bright radio sources at 178 MHz Flux densities optical identifications and the cosmological evolution of powerful radio galaxies Monthly Notices of the Royal Astronomical Society 204 151 Bibcode 1983MNRAS 204 151L doi 10 1093 mnras 204 1 151 External links editThe Revised 3C Catalogue of Radio Sources on the internet The 3CRR catalogue on the internet Retrieved from https en wikipedia org w index php title Third Cambridge Catalogue of Radio Sources amp oldid 1148002519, wikipedia, wiki, book, books, library,
