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J/PASP/111/57       Galactic reddening maps                  (Hudson+, 1999)
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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
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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{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 (0.01mag) 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{deg}<l<310{deg}, -20{deg}<b<20{deg}.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1.dat         67      311   Early-type galaxies
table3.dat         26       86   RR Lyrae and Abt & Golson stars
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label      Explanations
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   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        Mg_2_ 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
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Byte-by-byte Description of file: table3.dat
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  Bytes Format Units  Label      Explanations
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  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
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History: From PASP electronic version
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(End)                           James Marcout, Patricia Bauer [CDS]  15-Mar-1999