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

doi:10.3847/1538-4357/ac7da4

paper

Dissecting Nearby Galaxies with piXedfit: II. Spatially Resolved Scaling Relations Among Stars, Dust, and Gas

arXiv:2207.08382 · doi:10.3847/1538-4357/ac7da4

Abstract

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 ( $Σ_{H_{2}}$ -- $Σ_{SFR}$ -- $Σ_{*}$ ) 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 $Σ_{dust}$ -- $Σ_{H_{2}}$ 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 $Σ_{H_{2}}$ -- $Σ_{SFR}$ -- $Σ_{*}$ relations, which suggest that 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 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 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.

arXiv comment28 pages, 13 figures, accepted for publication in ApJ. piXedfit v1.0 is publicly available at https://github.com/aabdurrouf/piXedfit. Documentation is available at https://pixedfit.readthedocs.io/en/latest/. Some tutorials of practical usages in jupyter notebooks can be found at https://github.com/aabdurrouf/piXedfit/tree/main/examples

Dissecting Nearby Galaxies with piXedfit: II. Spatially Resolved Scaling Relations Among Stars, Dust, and Gas

Abstract

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