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We have performed stacking image analyses of galaxies over the Galacticextinction map constructed by Schlegel, Finkbeiner & Davis (1998). We select~10^7 galaxies in total from the Sloan Digital Sky Survey (SDSS) DR7photometric catalog. We detect clear signatures of the enhancement of theextinction in r-band, $\Delta A_r$, around galaxies, indicating that theextinction map is contaminated by their FIR (far infrared) emission. Theaverage amplitude of the contamination per galaxy is well fitted to $\DeltaA_r(m_r) = 0.64 \times 10^{0.17(18-m_r)}$ [mmag]. While this value is verysmall, it is directly associated with galaxies and may have a systematic effecton galaxy statistics. Indeed this correlated contamination leads to arelatively large anomaly of galaxy surface number densities against the SFDextinction A_SFD discovered by Yahata et al. (2007). We model the radialprofiles of stacked galaxy images, and find that the FIR signal around eachgalaxy does not originate from the central galaxy alone, but is dominated bythe contributions of nearby galaxies via galaxy angular clustering. Theseparation of the single galaxy and the clustering terms enables us to inferthe statistical relation of the FIR and r-band fluxes of galaxies and also toprobe the flux-weighted cross-correlation of galaxies, down to the magnitudesthat are difficult to probe directly for individual objects. We repeat the samestacking analysis for SDSS DR6 photometric quasars and discovered the similarsignatures but with weaker amplitudes. The implications of the present resultsfor galaxy and quasar statistics and for correction to the Galactic extinctionmap are briefly discussed.

Detection of Far Infrared Emission from Galaxies and Quasars in the Galactic Extinction Map by Stacking Analysis