Spectral Mapping of Classical Double Radio Sources
نویسندگان
چکیده
منابع مشابه
Modelling the spectral evolution of classical double radio sources
The spectral evolution of powerful double radio galaxies (FR II’s) is thought to be determined by the acceleration of electrons at the termination shock of the jet, their transport through the bright head region into the lobes and the production of the radio emission by synchrotron radiation in the lobes. Models presented to date incorporate some of these processes in prescribing the electron d...
متن کاملThe Linear-size Evolution of Classical Double Radio Sources
Recent investigations of how the median size of extragalactic radio sources change with redshift have produced inconsistent results. Eales (1985) compared the radio and optical properties of a bright 3C and faint 6C sample and concluded that for a universe with 0 = 0 Dmed / (1 + z) 1:1 , with Dmed being the median size of the radio sources at a given epoch and z the redshift. Oort, Katgert, and...
متن کاملOn the jet speeds of classical double radio sources
A simple integral relation is obtained for the distribution functions of jet speeds and jet-counterjet flux asymmetries of classical double radio sources. Analytic expressions relating the mean jet speed and the mean jet flux asymmetry, and their variances are derived. The results are considered in the light of orientation-based unified schemes, and an analytical equation for the critical angle...
متن کاملAn asymmetric relativistic model for classical double radio sources
There is substantial observational evidence against the symmetric relativistic model of FRII radio sources. An asymmetric relativistic model is proposed which takes account of both relativistic effects and intrinsic/environmental asymmetries to explain the structural asymmetries of their radio lobes. A key parameter of the model is the jet-side of the double sources, which is estimated for 80% ...
متن کاملRelics of Double Radio Sources
We have formed a new sample which consists of extended extragalactic radio sources without obvious active galactic nuclei (AGN) in them. Most of these sources appear to be dead double radio sources. These sources with steep spectra (α < -1.8; S ∝ ν) were identified using the 74 (VLSS) and the 1400 MHz (NVSS) surveys and further imaged using the Very Large Array (VLA) and the Giant Meterwave Rad...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2002
ISSN: 0074-1809
DOI: 10.1017/s0074180900168834