Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..195k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, July 1989, p. 195-203.
Astronomy and Astrophysics
Astronomy
17
Active Galactic Nuclei, Andromeda Galaxy, Gas Ionization, Luminosity, Stellar Motions, Visible Spectrum, Balmer Series, Black Holes (Astronomy), Line Spectra, Quasars, Red Shift
Scientific paper
Optical spectra obtained in subarcsecond seeing have been analyzed in order to explore the emission-line properties and stellar dynamics of the nuclear region (r of less than 8 kpc) in M81. Stellar velocity dispersions suggest a central mass of order 10 to the 7th solar masses. In addition to the broad Balmer lines, emission from forbidden Fe VII is noted at the nucleus which probably derives from an intermediate-density region. Strong and narrow forbidden N I emission, peaking sharply at the nucleus, is observed. It is noted that the presence of other forbidden lines, such as forbidden O III 5007-A lines, show complex multicomponent profiles at the nucleus which may complicate physical interpretation of the line-width/critical-density relations.
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