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J/PASP/111/57       Galactic reddening maps                  (Hudson+, 1999)

A test for large-scale systematic errors in maps of galactic reddening Hudson M.J. <Publ. Astron. Soc. Pac. 111, 57 (1999)> =1999PASP..111...57H
ADC_Keywords: Reddening ; Galaxies, photometry ; Stars, variable 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, 1982, Cat. J/AJ/87/1165) and those of Schlegel, Finkbeiner, & Davis (1998ApJ...500..525S, 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 (0.01mag) 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°. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 67 311 Early-type galaxies table3.dat 26 86 RR Lyrae and Abt & Golson stars
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Galaxy name 13- 16 F4.2 mag B-V B-V colour index 18- 25 F8.4 deg GLON Galactic longitude 27- 34 F8.4 deg GLAT galactic latitude 36- 41 F6.4 mag Mg2 Mg2 index 43- 45 I3 --- Qual Quality flag 47- 52 F6.4 mag E(B-V)SFD Schlegel et al. (1998ApJ...500..525S) reddening 54- 60 F7.4 mag E(B-V)BH Burstein & Heiles (1982, Cat. J/AJ/87/1165) reddening 62 I1 --- Cluster [0/1] 0: field, 1: cluster/group 64- 67 I4 km/s sigma ?=-999 Cluster/group velocity dispersion
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 F6.2 deg GLON Galactic longitude 8- 13 F6.2 deg GLAT Galacitc latitude 15- 20 F6.3 mag E(B-V) Reddening 22- 26 F5.3 mag E(B-V)SFD Schlegel et al. (1998ApJ...500..525S) reddening
History: From PASP electronic version
(End) James Marcout, Patricia Bauer [CDS] 15-Mar-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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