A Statistical Study on the Difference between Normal and Starburst Galaxies
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概要
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Observational properties are compared between normal galaxies (NGs) and starburst ones (SBGs) in detail in order to investigate the nature of starburst activity in galaxies. Photometric, spectroscopic, and neutral hydrogen data are compiled from available literatures for 64 NGs and 41 SBGs. The comparisons are made for each morphological type of galaxies. In this analysis, a new measure of degree of UV excess (DUV) is introduced to evaluate activity level of the starburst phenomena statistically. The DUV is defined by a color excess subtracting a mean color of the normal galaxies of the same morphological type as that of the SBG from an observed color of the SBG. Our main conclusions are as follows. (1) The difference of HI properties between the SBGs and the NGs are more significant for early type (E, SO, and Sa) galaxies than for late type ones.(2) The characteristics of the starburst activity may be controlled by the local properties of the pre-starburst region rather than by the global properties of the underlying galaxies. And,(3) the DUV in U-B, A(U-B), which is a function of the underlying color of the galaxy, provides a quantitative measure to evaluate the strength of the starburst activity. It is proposed that any comparative study of the star forming activities among galaxies should be made for the same morphological type (i.e., nearly the same underlying color) of galaxies.Starburst galaxiesNormal galaxiesStar formation
- 東北大学の論文
- 1986-01-20
著者
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TANIGUCHI Yoshiaki
Astronomical Institute, Graduate School of Science, Tohoku University
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Taniguchi Yoshiaki
Astronomical Institute Faculty Of Science Tohoku University
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