Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54..661t&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.54, No.5, pp.661-682
Astronomy and Astrophysics
Astronomy
2
Galaxies: Active, Galaxies: Kug, Galaxies: Seyfert, Galaxies: Starburst
Scientific paper
We investigated the optical spectroscopic properties of 44Kiso Ultraviolet-excess Galaxies (KUG), which is one of the most well-known catalogs of blue galaxies. All of our sample galaxies belong to the spiral-peculiar (Sp) type, the morphological class of spiral galaxy with a peculiar bar and/or a nucleus in KUGs. Since the Sp type is considered to be the most peculiar group among KUGs, and about 45% of the KUGs have the Sp type, a detailed study of the Sp type is crucial to understand the characteristics of the KUG. The sample galaxies have luminosities in the B-band of about 108 to less than 1010 in solar unit, and a median physical size of 13kpc. From the nuclear spectra, we determined line excitation sources in 39 galaxies. Among them, we detected four AGNs reliably: two Seyfert1s, one Seyfert2, and one LINER. Other sample galaxies show moderately star-forming activity. For this category of ordinary KUG group, the mode of the Hα equivalent width at the nuclear region is a bin of 40 to 60Å. Three galaxies have extreme starburst nuclei with an Hα equivalent width of more than 200Å. The internal extinction of AV is about 0.8mag, which suggests that the star-forming nuclei are not heavily enshrouded by dust.
Maehara Hideo
Tomita Akihiko
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