Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21631601s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #316.01; Bulletin of the American Astronomical Society, Vol. 41, p.896
Other
Scientific paper
We present measurements of reddening due to dust using the colors of stars in the Sloan Digital Sky Survey (SDSS). We measure the color of main sequence turn-off stars by finding the ``blue tip'' of the stellar locus: the prominent blue edge in the distribution of stellar colors. The method is sensitive to color changes of order 18, 13, 7, and 8 mmag of reddening in the colors u-g, g-r, r-i, and i-z, respectively. We present maps of the blue tip colors in each of these bands over the SDSS footprint including the dusty southern galactic cap data provided by the SDSS-III. These measurements are used to test dust column density and the extinction law. The results disfavor the best fit O'Donnell reddening law with RV = 2.8, but are well described by a Fitzpatrick 1999 reddening law with RV = 3.1. The SFD dust map is found to trace the dust well. While other studies in dusty regions have found that SFD overestimates dust column density by factors of 40%, we find that at high latitudes and lower column densities, the SFD normalization is correct to within our uncertainties for g-r. In u-g, r-i, and i-z, we find that the SFD prescription overestimates reddening by factors of 1.3, 1.1, and 1.3, respectively. After dereddening the blue tip maps according to the extinction law and normalization from this work, dust-correlated residuals are smaller than 30, 30, 10, and 10 mmag in the footprint we fit, which covers most of the high latitude SDSS footprint. However, coherent residuals remain in a few clouds. These regions can be fit individually and require different dust map normalizations, suggesting problems with the SFD temperature correction. We plan on using these reddening measurements to constrain future maps of dust column density based on dust emission.
Finkbeiner Douglas Paul
Schlafly Eddie
Schlegel David James
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