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We propose a novel method to constrain the spatial extent of dust aroundgalaxies through the measurement of dust temperature. Our method combines thedust emission of galaxies from far-infrared (FIR) image stacking analysis andthe quasar reddening due to the dust absorption around galaxies. As a specificapplication of our method, we use the stacked FIR emission profiles of SDSSphotometric galaxies over the IRAS 100$\mu$m map, and the recent measurement ofthe SDSS galaxy-quasar cross-correlation. If we adopt a single-temperature dustmodel, the resulting temperature is around 18K, which is consistent with atypical dust temperature for a central part of galaxies. If we assume anadditional dust component with much lower temperature, the current data implythe temperature of the galactic dust needs to be higher, 20K to 30K. Since themodel of the density and temperature distribution of dust adopted in thecurrent paper is very simple, we cannot draw any strong conclusion at thispoint. Nevertheless our novel method with the elaborated theoretical model andmulti-band measurement of dust will offer an interesting constraint on thestatistical nature of galactic dust.

Constraining spatial extent and temperature of dust around galaxies from far-infrared image stacking analysis