Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...309l...5j&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 309, Oct. 1, 1986, p. L5-L8. NASA-supported researc
Astronomy and Astrophysics
Astrophysics
13
Astronomical Spectroscopy, Galactic Nuclei, Radio Spectra, Spectral Energy Distribution, Astronomical Maps, Asymmetry, Plasma Jets, Very Long Base Interferometry
Scientific paper
High dynamic range VLBI hybrid maps of the nucleus of NGC 6251 at 18 cm have been made in order to study its structure. The maps are consistent with a simple two-sided relativistic beaming model of the nucleus only if the radio axis is aligned within 10 deg of the line of sight and the flow velocity in the two jets is greater than 0.7c. This implies an unreasonably large physical size for the extended radio emission associated with this galaxy. The most plausible alternative explanation is that both jets are transporting energy to the radio lobes continuously, but that the counterjet is much less efficient at converting a fraction of this energy into radio emission than the brighter jet is.
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