Abstract
An 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 recently formed massive stars is attenuated by dust, which is also produced by star formation (SF) activity, and is reemitted at mid- and far- infrared (IR) wavelengths. In this study, we investigate the star formation rate (SFR) and dust extinction using UV and IR data. We selected local galaxies which are detected at AKARI FIS 90 um and matched the IRAS IIFSCz 60 um select catalog. We measured FUV and NUV flux densities from GALEX images. We examined the SF and extinction of Local galaxies using four bands of AKARI. Then, we calculated FUV and total IR luminosities, and obtained the SF luminosity, L_{SF}, the total luminosity related to star formation activity, and the SFR. We find that in most galaxies, L_{SF} is dominated by L_{dust}. We also find that galaxies with higher SF activity have a higher fraction of their SF hidden by dust. In fact, the SF of galaxies with SFRs >20 M_{sun}/yr is almost completely hidden by dust. Our results boast a significantly higher precision with respect to previously published works, due to the use of much larger object samples from the AKARI and GALEX all sky surveys.
Highlights
The evolution of galaxies is one of the most fundamental problems in modern observational cosmology
The flux density Sν at the frequency ν and the monochromatic luminosity Lν of an object are related through the following equation: The AKARI- and GALEX-band luminosities are calculated with the following formulae because of the different definitions of AKARI and GALEX photometry
The summary and conclusions of this study are as follows: (1) The star formation luminosity, LSF, is dominated by the emission from dust related to SF activity, (1 − η) L total IR (TIR)
Summary
The evolution of galaxies is one of the most fundamental problems in modern observational cosmology. Since all heavy elements (elements whose atomic number is larger than Boron) have not been produced by Big Bang Nucleosynthesis but rather by stars, the investigation of star formation is related to the quest for understanding the origin of the Earth, planets, and ourselves. An accurate estimation of the star formation-related properties of galaxies is crucial for an understanding of the evolution of galaxies. As mentioned above, stars produce heavy elements (or metals1) and release them through explosive phenomena during the final phases of stellar evolution such as planetary nebulae, Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB
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