High-frequency Radio Continuum Observations of Giant Radio Galaxies

Details High-frequency Radio Continuum Observations of Giant Radio Galaxies High-frequency Radio Continuum Observations of Giant Radio Galaxies

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995yera.conf...19m&link_type=abstract

The XXVIIth Young European Radio Astronomers Conference, ed. D.A. Green and W. Steffen, in association with Cambridge University

Astronomy and Astrophysics

Astronomy

Scientific paper

Giant radio galaxies (GRGs) form the extreme end of the linear size distribution of radio galaxies, with sizes in excess of 1 Mpc. Using the Effelsberg 100-m telescope we have performed a high-frequency radio continuum survey of these objects. The extraordinary size and the high dynamic range of these maps required the installation of a number of new data reduction procedures. One of these - a Hogbom-like CLEAN algorithm of single-dish data - enables us to reach dynamic ranges of 30 dB at present and an estimated dynamic range of order 40 dB after further improvements in near future. Our maps provide the necessary data base complementing low-frequency observations gained with the WSRT and the VLA. Together with the interferometer data it is possible to determine for the first time important physical parameters (like spectral indices, break frequencies, spectral ages, rotation measures, depolarization) over a very large frequency range. Because of their immense sizes, these sources can also serve as unique probes for the characteristics of the surrounding intergalactic medium (IGM).

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