A jet-like optical continuum filament in the active galaxy NGC 1275 (Perseus A)

Details A jet-like optical continuum filament in the active galaxy NGC 1275 (Perseus A) A jet-like optical continuum filament in the active galaxy NGC 1275 (Perseus A)

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208...17m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 17-21.

Astronomy and Astrophysics

Astrophysics

16

Active Galactic Nuclei, Active Galaxies, Visible Spectrum, Astronomical Spectroscopy, Echelle Gratings, Forbidden Transitions, H Ii Regions, Oxygen Spectra

Scientific paper

The Manchester echelle spectrometer/imager has been used in its photon-counting imaging mode, combined with the 4.2-m Herschel telescope, to investigate the structure of the O III forbidden emission line and optical continuum regions away from the nucleus of the active galaxy NGC 1275. A fine filament of optical continuum emission is present in the NW quadrant of the galaxy with ionized knots along its length. This feature points directly back to the very bright unresolved star-like nucleus and is oriented along PA = 295 deg, but curiously has no radio continuum counterpart as would be expected if it were the manifestation of a jet of plasma from the nucleus. The only evidence for a radio jet from the nuclear source is along PA = 162 deg which is clearly separate from the optical continuum filament described here. Long-slit, echelle, and spectral observations show that the associated ionized knots are in the velocity system of NGC 1275 which has a heliocentric radial velocity of 8200 km/s.

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