Asymmetric depolarization in double radio sources with one-sided jets
نویسندگان
چکیده
منابع مشابه
Asymmetric depolarization in double low-luminosity radio galaxies
To investigate the presence of the Laing-Garrington effect (i.e. the lobe containing the jet more depolarized than that containing the counter-jet), we analyse polarization data at 6 and 20 cm for a sample of double low-luminosity radio galaxies. The effect is well visible, although not very strong.We therefore confirm what was inferred in a previous paper based on data at one frequency (20 cm)...
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 کاملLate-time Radio Re-brightening of Gamma-ray Burst Afterglows: Evidence for Double-sided Jets
The central engine of gamma-ray bursts (GRBs) is believed to eject double-sided ultra-relativistic jets. For an observed GRB, one of the twin jets should point toward us, and is responsible for the prompt gamma-ray and subsequent afterglow emission. We consider in this Letter the other receding jet, which will give rise to late-time radio re-brightening (RRB) when it becomes non-relativistic (N...
متن کاملOptimal Asymmetric One-Sided Group Sequential Tests
We extend the optimal symmetric group sequential tests of Eales & Jennison (1992) to the broader class of asymmetric designs. Two forms of asymmetry are considered, involving unequal type I and type II error rates and different emphases on expected sample sizes at the null and alternative hypotheses. We discuss the properties of our optimal designs and use them to assess the efficiency of the f...
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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1991
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/250.1.171