Effect of the Nonuniformity of Radio Sources on Estimates of Their Physical Parameters.
- Resource Type
- Article
- Authors
- Artyukh, V.; Nedora, V.
- Source
- Astrophysics. Sep2017, Vol. 60 Issue 3, p313-324. 12p.
- Subject
- *RADIO jets (Astrophysics)
*ACTIVE galactic nuclei
*ANGULAR diameter (Astronomy)
*VERY long baseline interferometry
*COMPACT objects (Astronomy)
- Language
- ISSN
- 0571-7256
Estimating the physical parameters of nonuniform radio sources in active galactic nuclei (AGN) requires knowledge of the angular dimensions of radio sources at the low frequencies where a steep slope (cutoff) in the low-frequency spectrum (opacity region) is observed. In most compact radio sources, the low-frequency cutoff lies in the meter wavelength range. At present there are no VLBI systems operating at meter wavelengths, so the low-frequency dimensions of compact radio sources in AGN cannot be measured directly. Here we propose a method for estimating the low-frequency angular dimensions of compact radio sources (in the opacity region) based on the shape of their spectra. [ABSTRACT FROM AUTHOR]