Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..775h&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Feb. 15, 1986, p. 775-784.
Astronomy and Astrophysics
Astronomy
46
Extragalactic Radio Sources, Galactic Nuclei, Galactic Structure, Seyfert Galaxies, Very Long Base Interferometry, Angular Resolution, Centimeter Waves, Collimation, Radiant Flux Density, Radio Jets (Astronomy), Ultraviolet Spectra, Visible Spectrum
Scientific paper
The authors present MK III European VLBI Network observations of the nucleus of NGC 4151 with an angular resolution of 20 milliarcsec (1.3 pc). They have also monitored the flux density of the nucleus at a wavelength of 18 cm using the MERLIN network, and find no evidence for variability greater than 10 mJy. The structure is a 450-milliarsec collinear triple source along PA ≅ 83°. The outer components are resolved and have sizes of ≅30 and ≅60 milliarsec (2 and 4 pc). The stronger of these components is elongated in PA ≅ 57°, which is close to the PA of the arcminute-scale optical structure, but is misaligned with the arcsecond-scale radio structure. This suggests that the UV radiation responsible for ionizing the extended gas is collimated on a scale of <1 pc, whilst the final collimation of the radio jet occurs on a scale of >1 pc.
Burgess Paul
Graham David A.
Harrison Bill
Pedlar Alan
Preuss E.
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