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Date and Time of the Query: 2019-06-16 T09:52:49 PDT
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For refcode 1989ApJ...343...18B:
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1989ApJ...343...18B ON SYSTEMATIC ERRORS IN DISTANCE ESTIMATES OF THE VIRGO CLUSTER AND THE INTRINSIC SCATTER IN THE TULLY-FISHER RELATION DAVID BURSTEIN Department of Physics, Arizona State University; and Institute of Astronomy, Cambridge, England AND SOMAK RAYCHAUDHURY Institute of Astronomy, Cambridge, England Received 1988 December 8; accepted 1989 January 17 ABSTRACT Recent estimates of the amplitude of scatter in the Tully-Fisher relation and the related question of distance to the Virgo cluster are critically examined. The scatter of 0.7 mag in the Tully-Fisher relation found by Kraan-Korteweg, Cameron, and Tammann is found to be primarily observational in origin, the combination of line-of-sight effects within their 121 galaxy sample and the use of older, poorly determined magnitudes. The true scatter in the Tully-Fisher relation is less than 0.4 mag, as found by Pierce and Tully. The assumptions that both Pierce and Tully and Kraan-Korteweg, Cameron, and Tammann used in their separate determinations of the distance to the Virgo cluster are applied to the same combined sample of 131 galaxies, defined to be consistent with the formalism of Kraan-Korteweg, Cameron, and Tammann. The use of different subsets of calibrator galaxies by the two studies permits both distance estimates to be consistent with these data, despite differing in predicted distance modulus by 0.6 mag! In the absence of a general agreement on inclination corrections to magnitudes, diameters, and rotation velocities, the choice of calibrator galaxies and the distances to them and the reliability of observed data, no agreement can be reached on the distance of the Virgo cluster as derived from the Tully-Fisher relation for spiral galaxies. Subject headings: cosmology - galaxies: clustering - galaxies: distances
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