EFFECT OF THE NONUNIFORMITY OF RADIO SOURCES ON ESTIMATES OF THEIR PHYSICAL PARAMETERS

被引:2
作者
Artyukh, V. S. [1 ]
Nedora, V. S. [2 ]
机构
[1] Russian Acad Sci, PN Lebedev Inst Phys, Moscow, Russia
[2] Rheinische Friedrich Wilhems Univ, Bonn, Germany
关键词
active galactic nuclei; radio jets; magnetic fields; RELATIVISTIC JETS; X-RAY;
D O I
10.1007/s10511-017-9485-6
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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.
引用
收藏
页码:313 / 324
页数:12
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