Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...71..433p&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 71, Nov. 1989, p. 433-453.
Astronomy and Astrophysics
Astrophysics
130
Galactic Nuclei, Ionized Gases, Spiral Galaxies, Astronomical Spectroscopy, Charge Coupled Devices, Emission Spectra, H Ii Regions, Star Formation, Stellar Structure
Scientific paper
A study of the distribution of ionized gas in the nuclear regions of a statistically significant sample of 91 non-Seyfert spirals is reported. CCD interference band images isolating the bright emission-lines of H-alpha + forbidden N II (6548, 6583 A) have been used to map the distribution of ionized gas in the inner 1-2 kpc of these galaxies. The galaxies exhibit a rich variety of nuclear and circumnuclear emission-line structures ranging from no-detectable emission to bright stellar nuclei with complicated circumnuclear emission regions extending for many kiloparsecs. Trends with Hubble-type and low-ionization nuclear emission-line spectral type (LINER or H II region) have been discerned. In galaxies with nuclear H II regions, those regions are on average the brightest H II regions in their host galaxies. It appears that nonthermal nuclear activity and nuclear star formation prefer different nuclear environments, with active nuclei tending to be found in intermediate-type galaxies, and nuclear H II regions preferring late-type spirals. It is speculated that this preference may be related to the dynamical properties of the host galaxies.
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