We study the integral Galactic extinction and reddening based on the galaxy catalog of the South Galactic Cap U-band Sky Survey (SCUSS), where u band galaxy number counts and u - r color distribution are used to derive the Galactic extinction and reddening respectively. We compare these independent statistical measurements with the reddening map of Schlegel et al. (1998)(SFD) and find that both the extinction and reddening from the number counts and color distribution are in good agreement with the SFD results at low extinction regions (E(B - V )SFD< 0.12 mag). However, for high extinction regions (E(B-V )SFD> 0.12 mag), the SFD map overestimates the Galactic reddening systematically, which can be approximated by a linear relation ΔE(B-V ) = 0.43[E(B-V )SFD-0.12]. By combing the results of galaxy number counts and color distribution together, we find that the shape of the Galactic extinction curve is in good agreement with the standard RV= 3.1 extinction law of O'Donnell (1994).
|Original language||English (US)|
|State||Published - Jan 6 2017|
- Dust, extinction
- Methods: statistical
- Techniques: photometric
ASJC Scopus subject areas