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arXiv · astro-ph/9706088

Characteristics of Kiso Ultra-Violet Excess Galaxies

Akihiko Tomita·Tsutomu T. Takeuchi·Tadashi Usui·Mamoru Saito
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Abstract

We examined the general characteristics of the Kiso Ultra-violet Excess Galaxies (KUGs). We present for the first time the quantitative expressions for the criteria of the KUGs; the boundary color separating the KUGs from the non-KUGs is (B-V)_{T} = 0.74 and the KUG degrees of UV strength are found to correlate with the mean (B-V)_{T} colors. We investigate the nature of the KUGs, a sample of blue galaxy population, and show that (1) about a half of the KUGs are spiral galaxies with Sb to Scd, (2) the KUGs are biased to late-type galaxies and include early-type galaxies with young star populations, and (3) the KUGs are preferably found among less luminous galaxies with log L(B) < 10. The KUGs also contain the post-starburst galaxies, many of which are found among the blue galaxy population at intermediate redshifts. The analysis of the far-infrared data shows that a typical present-to-past star formation rate for a KUG is 0.4.

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Akihiko Tomita, Tsutomu T. Takeuchi, Tadashi Usui, Mamoru Saito. 1997-08-15. Characteristics of Kiso Ultra-Violet Excess Galaxies. https://doi.org/10.1086/118605

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