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Dissecting Nearby Galaxies with piXedfit: II. Spatially Resolved Scaling Relations Among Stars, Dust, and Gas
Abdurro'uf, Yen-Ting Lin, Hiroyuki Hirashita, Takahiro Morishita, Sandro Tacchella, Po-Feng Wu, Masayuki Akiyama, Tsutomu T. Takeuchi
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We study spatially resolved scaling relations among stars, dust, and gas in ten nearby spiral galaxies. In a preceding paper Abdurro'uf et al. (2022), we have derived spatially resolved properties of the stellar population and dust by panchromatic spectral energy distribution (SED) fitting using piXedfit. Now, we investigate resolved star formation (Σ_(H₂)--Σ_(SFR)--Σ_*) and dust scaling relations. While the relations with all sub-galactic 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_(H₂) do not show noticeable galaxy-to-galaxy variations among our sample galaxies. We further investigate correlations among the scaling relations. We find significant correlations among the normalization of the Σ_(H₂)--Σ_(SFR)--Σ_* relations, which suggest that galaxies with higher levels of resolved H₂ fraction (f_(H₂)) tend to have higher levels of resolved star formation efficiency (SFE) and specific star formation rate (sSFR). We also observe that galaxies with higher levels of resolved dust-to-stellar mass ratios tend to have higher levels of resolved sSFR, SFE, and f_(H₂). Moreover, we find that galaxies with higher global sSFR and less compact morphology tend to have higher levels of the resolved sSFR, SFE, and f_(H₂), which can explain the variations in the normalization of the Σ_(H₂)--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.
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