INTERFEROMETRY OF CENTAURUS A
Abstract
Fan beam observations with a beamwidth of 2.3 min have revealed two distinct components to the central concentration of Centaurus A. Earlier interferometric data had shown an equivalent elliptical distribution oriented with the major axis in position angle 130 degrees, and it seemed possible that the two-dimensional arrangement of the two components might be determined by the earlier data. The expected complex visibility has been calculated for different models that are compatible with the fan beam observations, and compared with interferometric data of Mills (Australian J. Phys. 6:452-470, 1952) and Twiss, Carter and Little (The Observatory 80:153-159, 1960), and Moffet. The possible arrangements of the components have been narrowed down to two, each quite plausible on other grounds. The validity of interferometry for unraveling source distributions is confirmed, especially if a wise choice of spacings and azimuths is made. The calculated visibilities furnish a guide to future observations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1961
- Accession Number
- AD0261737
Entities
People
- R.n. Bracewell
Organizations
- Stanford University