Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....121.2483u&link_type=abstract
The Astronomical Journal, Volume 121, Issue 5, pp. 2483-2498.
Astronomy and Astrophysics
Astronomy
6
Galaxies: Abundances, Galaxies: Spiral, Galaxies: Starburst, Techniques: Spectroscopic
Scientific paper
We study the characteristics of central star-forming regions of early-type spiral galaxies by optical spectroscopic observations. The sample consists of 13 galaxies which have ratios of far-infrared (FIR) to optical B-band luminosity, log(LFIR/LB), larger than the average of this type, -0.5. Strong line emissions are detected around the nucleus, and the line ratios of most regions are H II region-like, except for a few shocked regions. There is no low-ionization nuclear emission-line region (LINER). The [N II] and [S II] lines are somewhat enhanced, compared to the disk H II regions, but the enhancements cannot be attributed to hidden active galactic nuclei (AGNs) and the shock excitation. The median extinction derived from the Hα/Hβ intensity ratio is 1.0 mag in AV, and the median SFR of our sample galaxies, corrected for extinction, is estimated to be 2 Msolar yr-1. Both values are comparable to those of late-type spiral galaxies. We find a correlation that the radii of the central star-forming regions tend to become larger with the turn-over radii of the rotation curves.
Saitō Mamoru
Tomita Akihiko
Usui Tadashi
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