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

Creators: Abdurro'uf, Abdurro'uf; Lin, Yen-Ting; Hirashita, Hiroyuki; Morishita, Takahiro; Tacchella, Sandro; Wu, Po-Feng; Akiyama, Masayuki; Takeuchi, Tsutomu T.

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 (ΣH2-ΣSFR-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 Σdust-Σgas and Σdust-ΣH2 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 ΣH2-ΣSFR-Σ* relations, which suggest that the galaxies with higher levels of resolved H2 fraction (fH2) 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 fH2. 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 fH2, which can explain the variations in the normalization of the ΣH2-ΣSFR-Σ* relationships. Overall, we observe indications of the contributions of both global and local factors in governing the star formation process in galaxies.

Additional Information

We are grateful for support from the Ministry of Science and Technology of Taiwan under grants MOST 109-2112-M-001-005 and MOST 110-2112-M-001-004, and a Career Development Award from Academia Sinica (AS-CDA-106-M01). H.H. thanks the Ministry of Science and Technology of Taiwan for support through grant MOST 108-2112-M-001-007-MY3, and the Academia Sinica for Investigator Award AS-IA-109-M02. P.F.W. acknowledges the support of the fellowship from the East Asian Core Observatories Association. The computations in this research were run on the TIARA cluster at ASIAA. This research made use of Astropy, 12 a community-developed core Python package for Astronomy (Astropy Collaboration et al. 2013, 2018). This research made use of Photutils, an Astropy package for detection and photometry of astronomical sources (Bradley et al. 2019). This work is based on observations made with the NASA Galaxy Evolution Explorer (GALEX), which is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High Performance Computing at the University of Utah. The SDSS website is www.sdss.org. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This work is based in part on observations made with the Spitzer Space Telescope, which was operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

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