Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985natur.318...43k&link_type=abstract
Nature (ISSN 0028-0836), vol. 318, Nov. 7, 1985, p. 43-45.
Astronomy and Astrophysics
Astronomy
19
Emission Spectra, Galactic Nuclei, Galactic Structure, Line Spectra, Seyfert Galaxies, Spectral Energy Distribution, Astronomical Spectroscopy, Energy Transfer, Galactic Rotation
Scientific paper
It is shown that the type 2 Seyfert nucleus of NGC5929 contains two emission regions situated symmetrically about the center of the galaxy. Slit spectroscopy shows them to be spatially as well as kinematically distinct, each with a linewidth of about 200 km/s and ionization levels normally associated with Seyfert nuclei. Their location in the galaxy's rotation curve suggests that they move with the galaxy's disk gas. They probably result from energy transport from a central object of low photon luminosity, but high energy output. This system furnishes a very clear example of the presence of phenomena related to the presence of a central engine, but located at a significant distance from the ultimate source of energy. The existence of such objects suggest that the usual radiatively powered, nearly symmetric models for active nuclei may be misleading in many objects.
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