Image Stacking Analysis of SDSS Galaxies with AKARI Far-Infrared Surveyor Maps at 65μm, 90μm, and 140μm

Abstract

We perform image stacking analysis of Sloan Digital Sky Survey (SDSS) photometric galaxies over the AKARI Far-Infrared Surveyor (FIS) maps at 65μm, 90μm, and 140μm. The resulting image profiles are decomposed into the central galaxy component (single term) and the nearby galaxy component (clustering term), as a function of the r-band magnitude, m_r of the central galaxy. We find that the mean far-infrared (FIR) flux of a galaxy with magnitude m_r is well fitted with f^s_{90μm}=13*10^{0.306(18-m_r)}[mJy]. The FIR amplitude of the clustering term is consistent with that expected from the angular-correlation function of the SDSS galaxies, but galaxy morphology dependence needs to be taken into account for a more quantitative conclusion. We also fit the spectral energy distribution of stacked galaxies at 65μm, 90μm, and 140μm, and derive a mean dust temperature of ~30K. This is consistent with the typical dust temperature of galaxies that are FIR luminous and individually detected.

19 pages, 17 figures, 3tables, accepted for publication in PASJ

References in corpus (8)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• The $AKARI$ Far-Infrared All-Sky Survey Maps
• Far-infrared surveys of galaxy evolution
• Calibration of the AKARI Far-infrared All Sky Survey Maps
• Detection of Far Infrared Emission from Galaxies and Quasars in the Galactic Extinction Map by Stacking Analysis
• Point source calibration of the AKARI/FIS all-sky survey maps for staking analysis
• Modeling the anomaly of surface number densities of galaxies on the Galactic extinction map due to their FIR emission contamination
• An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data