SHAO Astrophysics Colloquium

Speaker: Shiyin Shen (SHAO)

Time: Jan 25 (Thursday), 3:00pm

Location: Lecture hall, 3rd floor
Title: The dust along the line-of-sight to extra-galactic objects

Abstract:  All the extra-galactic objects we observed have been extincted and reddened by the inter-galactic(cosmic)  and  Galactic dust. There are  measurements of the Galactic dust from infrared emissions, while we know few about the cosmic dust. In this talk, I will introduce our statistical measurements on the Galactic and cosmic dust respectively. We probe the Galactic dust extinction and reddening from galaxy number counts and color distributions  based on the cosmological principle. While for cosmic dust, we take the advantages of the large Quasar sample of SDSS, and make a statistical  probe to redshift z~3. The implications of the cosmic dust to extra-galactic background light is further discussed.