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Astron. Astrophys. 351, 827-833 (1999)


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Investigations of the Local supercluster velocity field

II. A study using Tolman-Bondi solution and galaxies with accurate distances from the Cepheid PL-relation

T. Ekholm 1,2, P. Lanoix 1, P. Teerikorpi 2, G. Paturel 1 and P. Fouqué 3

1 CRAL - Observatoire de Lyon, 69561 Saint Genis Laval CEDEX, France
2 Tuorla Observatory, 21500 Piikkiö, Finland
3 ESO, Santiago, Chile

Received 14 June 1999 / Accepted 28 September 1999

Abstract

A sample of 32 galaxies with accurate distance moduli from the Cepheid PL-relation (Lanoix 1999) has been used to study the dynamical behaviour of the Local (Virgo) supercluster. We used analytical Tolman-Bondi (TB) solutions for a spherically symmetric density excess embedded in the Einstein-deSitter universe ([FORMULA]). Using 12 galaxies within [FORMULA] from the centre we found a mass estimate of [FORMULA] for the Virgo cluster. This agrees with the finding of Teerikorpi et al. (1992) that TB-estimate may be larger than virial mass estimate from Tully & Shaya (1984). Our conclusions do not critically depend on our primary choice of the global [FORMULA] established from SNe Ia (Lanoix 1999). The remaining galaxies outside Virgo region do not disagree with this value. Finally, we also found a TB-solution with the [FORMULA] and [FORMULA] cited yielding exactly one virial mass for the Virgo cluster.

Key words: cosmology: theory – cosmology: distance scale – galaxies: distances and redshifts – galaxies: general – galaxies: kinematics and dynamics – galaxies: Local Group

Send offprint requests to: T. Ekholm

© European Southern Observatory (ESO) 1999

Online publication: November 16, 1999

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