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  • Dissecting Nearby Galaxies ...
    Abdurro’uf; Lin, Yen-Ting; Hirashita, Hiroyuki; Morishita, Takahiro; Tacchella, Sandro; Wu, Po-Feng; Akiyama, Masayuki; Takeuchi, Tsutomu T.

    Astrophysical journal/˜The œAstrophysical journal, 08/2022, Letnik: 935, Številka: 2
    Journal Article

    Abstract We study spatially resolved scaling relations among stars, dust, and gas in ten nearby spiral galaxies. In a preceding paper, we have derived spatially resolved properties of the stellar population and dust by a panchromatic spectral energy distribution fitting using piXedfit . Now, we investigate resolved star formation ( Σ H 2 –Σ SFR –Σ * ) and dust scaling relations. While the relations with all subgalactic regions of the galaxies are reasonably tight ( σ ≲ 0.3 dex), we find that most of the scaling relations exhibit galaxy-to-galaxy variations in normalization and shape. Only two relations of Σ dust –Σ gas and Σ dust – Σ H 2 do not show noticeable galaxy-to-galaxy variations among our sample galaxies. We further investigate the correlations among the scaling relations. We find significant correlations among the normalization of the Σ H 2 –Σ SFR –Σ * relations, which suggest that the galaxies with higher levels of resolved H 2 fraction ( f H 2 ) tend to have higher levels of resolved star formation efficiency (SFE) and specific star formation rate (sSFR). We also observe that the galaxies with higher levels of resolved dust-to-stellar mass ratios tend to have higher levels of resolved sSFR, SFE, and f H 2 . Moreover, we find that the galaxies with higher global sSFR and less compact morphology tend to have higher levels of the resolved sSFR, SFE, and f H 2 , which can explain the variations in the normalization of the Σ H 2 –Σ SFR –Σ * relationships. Overall, we observe indications of the contributions of both global and local factors in governing the star formation process in galaxies.