February 2-5, 2021

Poster Presentation

The relationship 
extinction-stellar mass and extinction-SFR in spatial resolved spiral galaxies

Author(s): Tae Hojo

Presenter: Tae Hojo (Nagoya University)

Dust exists in interstellar space. The dust absorbed and scatters stellar radiation, and re-radiates absorbed energy as far-infrared radiation. Thus, in order to the true spectrum, it is necessary to correct for dust extinction. In addition, because ultraviolet radiation is underestimated by extinction, making it difficult to estimate the star formation rate, so it is necessary to integrate both UV and IR observations for estimation. It is important to consider the dust extinction. In order to the dust extinction, we focus on the relation between extinction and star formation rate, and extinction and stellar mass. While previous studies have provided global relations that integrate over the galaxy (Garn & Best 2010), the relation for spatially resolved galaxies is still unclear. Spatial decomposition is expected to account for local differences in the environment of galaxies, and to provide relationships with un-integrated values. In this study, we investigate the spatial dependence of the relation between extinction and stellar mass, and extinction and star formation rate on the scale of 1kpc in nearby galaxies. The sample of nearby galaxies was selected from DustPedia. The results show that both extinction - stellar mass relation and extinction - star formation rate relation for galaxies spatially resolved to the kpc scale show the same trend as the global relation integrated over the galaxy. In addition, the details of these results will be discussed.

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