Cygnus A - Hot SPOT spectra and the condition of classical hydrodynamics

Details Cygnus A - Hot SPOT spectra and the condition of classical hydrodynamics Cygnus A - Hot SPOT spectra and the condition of classical hydrodynamics

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206..237m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 2, Nov. 1988, p. 237-244. Research supported by CNRS.

Astronomy and Astrophysics

Astronomy

26

Cygnus Constellation, Hydrodynamics, Radio Jets (Astronomy), Radio Sources (Astronomy), X Ray Sources, Electromagnetic Radiation, Peculiar Galaxies, Radio Spectra, Relativistic Particles, Thermal Plasmas

Scientific paper

The authors have observed Cygnus A hot spots at 408 MHz with MERLIN and using previous results obtained at 151 MHz with MERLIN and at 1450 MHz with the VLA (Leahy et al., 1988) and at 5 GHz and 15 GHz with the VLA (Carilli et al., 1987) convolved with a 3 arcsecond beam, corresponding to the MERLIN beam at 151 MHz, they get an accurate determination of hot spot spectra. The spectra exhibit a low frequency turnover at ν0 ≅ 200 MHz. From the knowledge of the spectral index at high frequencies, i.e. α1 ≅ 1.0 and the steepening frequency νs ≅ 2 GHz, the authors show that it is a priori possible to make a model of hot spots supplied by jets using classical hydrodynamics, i.e. υ < c/√3.

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