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Derivation of Distances with the Tully-Fisher Relation: The Antlia Cluster

Abstract : The Tully-Fisher relation is a correlation between the luminosity and the HI 21cm line width in spiral galaxies (LLW relation). It is used to derive galaxy distances in the interval 7 to 100 Mpc. Closer, the Cepheids, TRGB and Surface Brightness Fluctuation methods give a better accuracy. Further, the SNIa are luminous objects still available for distance measurement purposes, though with a dramatically lower density grid of measurements on the sky. Galaxies in clusters are all at the same distance from the observer. Thus the distance of the cluster derived from a large number of galaxies (N) has an error reduced according to the square root of N. However, not all galaxies in a cluster are suitable for the LLW measurement. The selection criteria we use are explained hereafter; the important point being to avoid Malmquist bias and to not introduce any systematics in the distance measurement.
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Contributor : Dominique Girod <>
Submitted on : Thursday, August 13, 2009 - 11:36:25 AM
Last modification on : Tuesday, November 19, 2019 - 2:44:06 AM

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  • HAL Id : in2p3-00409828, version 1
  • ARXIV : 0806.1140

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N. Bonhomme, H.M. Courtois, R.B. Tully. Derivation of Distances with the Tully-Fisher Relation: The Antlia Cluster. XLIIIth Rencontres de Moriond - Cosmology, 2008, La Thuile, Italy. ⟨in2p3-00409828⟩

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