85-GHz BIMA observations of the double-hotspot radio galaxy 3C 20

We present 85‐GHz observations of the archetypal double‐hotspot radio source 3C 20 made with the BIMA millimetre array. The resolution of BIMA allows us to separate the two components of the eastern hotspot. By comparing the BIMA observations with existing VLA data, we show that the spectra of the t...

Full description

Saved in:
Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2001-01, Vol.320 (3), p.355-364
Main Authors: Hardcastle, M. J., Looney, L. W.
Format: Article
Language:English
Subjects:
galaxies: individual: 3C 20
galaxies: jets
radio continuum: galaxies
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We present 85‐GHz observations of the archetypal double‐hotspot radio source 3C 20 made with the BIMA millimetre array. The resolution of BIMA allows us to separate the two components of the eastern hotspot. By comparing the BIMA observations with existing VLA data, we show that the spectra of the two hotspot components are very similar, despite the clear differences in their radio structure and their wide separation. We discuss the implications for models of double hotspot formation. Weak emission from the lobes of 3C 20 is detected at 85 GHz, at a level consistent with the predictions of standard spectral ageing models.
ISSN:0035-8711
1365-2966
DOI:10.1046/j.1365-8711.2001.03963.x