Multiple shocks in hot spots as the source of the spectral index-radio luminosity correlation in extended extragalactic radio sources

Details Multiple shocks in hot spots as the source of the spectral index-radio luminosity correlation in extended extragalactic radio sources Multiple shocks in hot spots as the source of the spectral index-radio luminosity correlation in extended extragalactic radio sources

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..305g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 305-310.

Statistics

Computation

9

Astronomical Spectroscopy, Luminosity, Radio Galaxies, Astronomical Models, Computational Astrophysics, Radio Jets (Astronomy), Radio Spectra

Scientific paper

The following recently established observations can be understood in terms of a simple model: (1) the radio spectral indices of the lobes of powerful extended double radio galaxies are steeper for more powerful sources; and (2) high resolution maps, with high dynamic range, have revealed 'hot spots' with multiple structure. The paper expands on the basic idea that the multi-peaked hot spots are due to a jet passing through a sequence of shocks within the lobe, and proposes that more powerful jets pass through more and/or stronger shocks before terminating subsonically. While passing through an oblique shock, both the plasma and the magnetic field are compressed, leading to an increase in synchrotron emissivity. During the periods between successive shocks, the highest energy electrons lose their energy fastest, thereby steepening the spectral index.

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