| Abstract |
Accurate estimation of the star formation -related properties of galaxies is crucial for understanding the evolution of galaxies. In galaxies, ultraviolet (UV) light emitted by formed massive stars is attenuated by the dust which is also producted by the SF activity, and is reemitted at mid- and far- infrared wavwlengths (IR). In this study, we investigated the star formation rate (SFR) and dust extinction using data at UV and IR. We selected local galaxies which are detected at AKARI FIS 90um band. We measured flux densities at FUV and NUV from the GALEX images. We wxamined the SF and extinction by using 4 wave bands given by AKARI.
Then, we calculated FUV and total IR luminosities, and obtained the so called SF luminosity (the total luminosity related to star formation activity) and the SFR. We found that in most of galaxies, SF luminosity is dominated by luminosity of dust. We also found that galaxies with higher SF activity have a higher fraction of SF hidden by dust. Especially, SF of galaxies which have SFRs > 20Myr is almost completely hidden by dust.
Although these results were claimed by previous studies, confirming them precisely using a much larger samples from AKARI and GALEX all sky surveys has a great impact on our understanding of the SF in Local galaxies. |
