Observations of Intense Radio Sources with a 1'5 Fan Beam

Abstract

view Abstract Citations (2) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of Intense Radio Sources with a 1'5 Fan Beam Legg, T. H. ; Bell, M. B. ; Bignell, R. C. Abstract The right ascension and east-west structure of seven intense radio sources have been determined at 10.7 cm using an antenna array with a 1,5 fan beam. The sources observed were Tau A, the Orion nebula, 3C273, Cyg A, Cas A, and the Omega nebula. Many observations of the moon were made concurrently in the hope of reducing systematic error by relating the lunar transit to the transit of the sources. Standard errors in right ascensions range from 0.16 to 0.58 and agreement as good or better than the standard error is found with the results of Fomalont (1968) at 21 cm, suggesting that there is no strong dependence of position upon wavelength. Some structural features are resolved for all sources except 3C273: the main sources in the Orion and Omega nebulas apparently remain asymmetrical when the secondary sources are accounted for; the peak emission from Vir A is more closely associated with the nucleus than the jet, with the halo component contributing approximately 28% of the total flux; and the third source in Cyg A con- tributes an estimated 10% of the total flux. Publication: The Astronomical Journal Pub Date: November 1968 DOI: 10.1086/110693 Bibcode: 1968AJ.....73..749L full text sources ADS | data products NED (6)