Publ. Astron. Soc. Pac., 111, 57-62 (1999/January-0)
A test for large-scale systematic errors in maps of galactic reddening.
Abstract (from CDS):
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°. 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-Mg2 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°<l<310°, -20°<b<20°.
ISM: Dust, Extinction - Galaxies: Distances and Redshifts - Galaxies: Elliptical and Lenticular, cD - Galaxy: Globular Clusters: General - Stars: Variables: Other
VizieR on-line data:
<Available at CDS (J/PASP/111/57): table1.dat table3.dat>
Table 3 : 86 RR Lyrae stars with classical V* designations found in 1978ApJ...225...40B.
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