A High Frequency Radio Continuum Investigation of Giant Radio Galaxies - Part One - Observations of Six Objects at 2.8-CENTIMETERS Wavelength

Details A High Frequency Radio Continuum Investigation of Giant Radio Galaxies - Part One - Observations of Six Objects at 2.8-CENTIMETERS Wavelength A High Frequency Radio Continuum Investigation of Giant Radio Galaxies - Part One - Observations of Six Objects at 2.8-CENTIMETERS Wavelength

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..729k&link_type=abstract

Astronomy and Astrophysics, Vol. 283, NO. 3/MAR(III), P. 729, 1994

Astronomy and Astrophysics

Astrophysics

20

Scientific paper

We have started a high-frequency radio continuum survey of giant radio galaxies (GRGs) with the aim to study the spectral index and polarization properties of these sources over a wide frequency range. Our measurements provide the necessary data base complementing low-frequency observations obtained with the WSRT. Here we report observations of NGC 315, DA 240, 4C 73.08, 3C 236, 3C 326, and NGC 6251 at λ2.8 cm, obtained with the Effelsberg 100-m telescope. Complete maps of the total and polarized emission of each source are presented, and their high-frequency radio morphologies as well as their magnetic field structures are discussed. While known jets and hot spots are detected, counter-jets are generally too weak and diffuse lobes are almost invariably narrower and more compact than at lower frequencies. The magnetic fields appear relaxed and remarkably uniform, as demonstrated by the high degrees of polarization (40%-60%) encountered. The outer edges of the hot spot regions are characterized by a circumferential magnetic field structure. This is probably the result of compression of the field caused by the ram pressure of the jets as they thrust through the intergalactic medium.

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