Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249...91m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 91-112.
Astronomy and Astrophysics
Astronomy
96
Active Galactic Nuclei, Photoionization, Radio Galaxies, Blazars, Brightness Distribution, Centaurus Constellation, Emission Spectra, Radiation Distribution, Radio Jets (Astronomy)
Scientific paper
Visible-band observations of the radio galaxy Cen A are reported. Data from long-slit 360-700-nm spectroscopy obtained with the B&C and EFOSC spectrographs on the 3.6-m telescope at ESO during 1987 and 1989, an R-band image obtained with the AAT, and forbidden O III (5007-A) images obtained with the EFOSC in March 1989 are presented and discussed in detail. The line-emitting filaments of the optical jet are found to have a complex structure with variation on 100-pc scales and no forbidden O III emission from the 'inner' or 'counter' jets. It is inferred that radiation from a nuclear continuum source (rendered invisible by obscuration and/or intrinsic anisotropy; e.g., relativistic beaming in the direction of the optical jet) is responsible for the photoionization of the filaments.
di Serego Alighieri Sperello
Fosbury Robert A. E.
Malin David F.
Morganti Rafaella
Robinson Alan
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