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We study spatially resolved properties (on spatial scales of $\sim 1-2$ kpcout to at least $3$ effective radii) of the stars, dust, and gas in ten nearbyspiral galaxies. The properties of the stellar population and dust are derivedby fitting the spatially resolved spectral energy distribution (SED) with morethan 20 photometric bands ranging from far-ultraviolet to far-infrared. Ournewly developed software piXedfit performs point spread function matching ofimages, pixel binning, and models the stellar light, dust attenuation, dustemission, and emission from a dusty torus heated by an active galactic nucleussimultaneously through the energy balance approach. With this self-consistentanalysis, we present the spatially resolved version of the IRX--$\beta$relation, finding that it is consistent with the relationship from theintegrated photometry. We show that the old stellar populations contribute tothe dust heating, which causes an overestimation of star formation rate (SFR)derived from the total ultraviolet and infrared luminosities on kpc scales.With archival high-resolution maps of atomic and molecular gas, we study theradial variation of the properties of the stellar populations (includingstellar mass, age, metallicity, and SFR), dust (including dust mass, dusttemperature, and abundance of polycyclic aromatic hydrocarbon), gas, as well asdust-to-stellar mass and dust-to-gas mass ratios. We observe a depletion ofmolecular gas mass fraction in the central region of the majority of thegalaxies, suggesting that the lack of available fuel is an important factor insuppressing the specific SFR at the center.

Dissecting Nearby Galaxies with piXedfit: I. Spatially Resolved Properties of Stars, Dust, and Gas as Revealed by Panchromatic SED Fitting