Polarization observations of DA240 - Structure of a hotspot

Details Polarization observations of DA240 - Structure of a hotspot Polarization observations of DA240 - Structure of a hotspot

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200..377t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 377-384.

Astronomy and Astrophysics

Astronomy

16

Galactic Radiation, Galactic Structure, Polarized Electromagnetic Radiation, Radio Galaxies, Astronomical Spectroscopy, Brightness Distribution, Electron Density (Concentration), Flux Density, High Resolution, Interstellar Magnetic Fields

Scientific paper

Observations of the large-scale structure of the giant radio galaxy DA240 at 0.15 and 1.4 GHz, and high-resolution observations of the hotspot in its eastern lobe at 2.7 and 5.0 GHz are presented. It is shown that the large-scale structure of DA240 at 0.15 GHz is closely similar to that at 1.4 GHz. An age of about 4 x 10 to the 7th yr is estimated from the spectral index. The hotspot contains a compact component of approximately equal to or less than 2.5 sq kpc in size, and is strongly polarized, up to 50-60 per cent in its south-east region. The projected magnetic field in the hotspot runs nearly parallel to the two main elongated subcomponents. The thermal electron density in the hotspot is estimated to be less than 2 x 10 to the -5th cu cm.

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