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Title:
A Test for Large-Scale Systematic Errors in Maps of Galactic Reddening
Authors:
Hudson, Michael J.
Affiliation:
AA(Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC, V8W 3P6, Canada; )
Publication:
The Publications of the Astronomical Society of the Pacific, Volume 111, Issue 755, pp. 57-62. (PASP Homepage)
Publication Date:
01/1999
Origin:
PASP
PASP Keywords:
ISM: DUST, EXTINCTION, GALAXIES: DISTANCES AND REDSHIFTS, GALAXIES: ELLIPTICAL AND LENTICULAR, CD, GALAXY: GLOBULAR CLUSTERS: GENERAL, STARS: VARIABLES: OTHER
DOI:
10.1086/316299
Bibliographic Code:
1999PASP..111...57H

Abstract

Accurate maps of Galactic reddening are important for a number of applications, such as mapping the peculiar velocity field in the nearby universe. Of particular concern are systematic errors which vary slowly as a function of position on the sky, as these would induce spurious bulk flow. We have compared the reddenings of Burstein & Heiles (BH) and those of Schlegel, Finkbeiner, & Davis (SFD) to independent estimates of the reddening, for Galactic latitudes |b|>10^deg. Our primary source of Galactic reddening estimates comes from comparing the difference between the observed B-V colors of early-type galaxies, and the predicted B-V color determined from the B-V-Mg_2 relation. We have fitted a dipole to the residuals in order to look for large-scale systematic deviations. There is marginal evidence for a dipolar residual in the comparison between the SFD maps and the observed early-type galaxy reddenings. If this is due to an error in the SFD maps, then it can be corrected with a small (13%) multiplicative dipole term. We argue, however, that this difference is more likely to be due to a small (0.01 mag) systematic error in the measured B-V colors of the early-type galaxies. This interpretation is supported by a smaller, independent data set (globular cluster and RR Lyrae stars), which yields a result inconsistent with the early-type galaxy residual dipole. BH reddenings are found to have no significant systematic residuals, apart from the known problem in the region 230^deg<l<310^deg, -20^deg<b<20^deg.

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