NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T05:03:51 PDT
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For refcode 1989ApJS...71..433P:
Retrieve 92 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1989ApJS...71..433P IONIZED GAS IN THE NUCLEAR REGIONS OF NEARBY NON-SEYFERT SPIRAL GALAXIES RICHARD W. POGGE Lick Observatory, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz; and McDonald Observatory, The University of Texas at Austin Received 1989 February 21; accepted 1989 May 1 ABSTRACT 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} + [N II] {lambda]{lambda}6548, 6583 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. Subject heading: galaxies: nuclei
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