NASA/IPAC EXTRAGALACTIC DATABASE
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For refcode 1998AJ....116.2166U:
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1998AJ....116.2166U PHOTOMETRIC OBSERVATIONS OF STAR FORMATION ACTIVITY IN EARLY-TYPE SPIRAL GALAXIES TADASHI USUI AND MAMORU SAITO Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan; usui@kusastro.kyoto-u.ac.jp, saitom@kusastro.kyoto-u.ac.jp AND AKIHIKO TOMITA Department of Earth and Astronomical Sciences, Faculty of Education, Wakayama University, Wakayama 640-8510, Japan; atomita@center.wakayama-u.ac.jp Received 1998 June 12; revised 1998 July 16 ABSTRACT We observationally study the current star formation activities of early- type spiral galaxies. We construct a complete sample of 15 early-type spiral galaxies having ratios of far-infrared (FIR) to optical B-band luminosity, log (L_FIR_/L_B_), larger than average for this type and present CCD imaging of the R and H{alpha} bands. The equivalent widths of H {alpha} emission increase with increasing L_FIR_/L_B_, indicating that log (L_FIR_/L_B_) can be an indicator of star formation for such early-type spiral galaxies with star formation activities higher than average. For all of the observed early-type spiral galaxies, the extended H II regions exist at the central regions with some asymmetric features. H{alpha} emission is more concentrated to the galactic center than the R-band light, and the degree of the concentration increases with the star formation activity. We also analyze the relation between the star formation activities and the existence of companion galaxies in the sample galaxies and other bright early-type spiral galaxies. No correlation is found; this suggests that the interaction is not responsible for all of the star formation activities of early-type spiral galaxies. Key words: galaxies: interactions-galaxies: photometry-galaxies: starburst- galaxies: spiral
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