Le 21 juin 2013
À 10h30
Amphithéâtre – Grande Coupole
Eddie SCHLAFLY
MPIA Heidelberg, Allemagne
We present work studying the three-dimensional distribution of dust inthe Galaxy, derived from Pan-STARRS1 stellar photometry, covering almost the entire sky north of declination -30 degrees. We infer the distance and reddening to more than half a billion stars well-observedby Pan-STARRS1 (Green et al., in prep). Along each line of sight, we find the reddening as a function of distance most consistent with the inferred reddening and distance to each star. We present dust maps with six arcminute resolution angular resolution in thirty logarithmically spaced distance bins from 100 pc to 10 kpc. Comparison of the PS1-based dust maps with the Schlegel et al (1998) map (SFD) indicates that we measure the dust column with an accuracy of 20 mmag at high-Galactic latitudes. The largest differences between the PS1-based dust maps and SFD stem from known limitations ofSFD in the Galactic plane. We are able to measure the distances to dust clouds to an accuracy of 10 percent, for high Galactic latitude clouds with distances between about 200 pc and 2 kpc, and are preparing a catalog of the distances to all such clouds in the PS1 footprint.