Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..209s&link_type=abstract
Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 209-212.
Astronomy and Astrophysics
Astrophysics
5
Emission Spectra, Galactic Nuclei, Line Spectra, Seyfert Galaxies, Gas Ionization, H Ii Regions, Kinematics, Radial Velocity, Spectrum Analysis
Scientific paper
Extranuclear emission line regions (ELR) with an extent of several kpc have been detected in the Seyfert galaxies MK10 and MK79 on long-slit photographic image tube spectrograms. A peak rotational velocity of 270 km/s has been derived for Mk10. The ELRs of Mk10 are unusually luminous in H-alpha for an Sb-galaxy and resemble the giant H II regions in Sc galaxies. They are most probably ionized by in situ hot stars rather than by the active nucleus of Mk10. The forbidden N II/H-alpha ratio of the ELRs in Mk79 is very similar to the nuclear value. Although this suggests ionization of the ELRs by the nucleus, other possibilities cannot be ruled out in this case. Some new data of the nuclear spectra are also presented.
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