Journal Article

The observed infall of galaxies towards the Virgo cluster

I. D. Karachentsev and O. G. Nasonova

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 405, issue 2, pages 1075-1083
Published in print June 2010 | ISSN: 0035-8711
Published online June 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16501.x
The observed infall of galaxies towards the Virgo cluster

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We examine the velocity field of galaxies around the Virgo cluster induced by its overdensity. We have studied the velocity–distance relation in Virgocentric coordinates using a sample of 1792 galaxies with distances from the tip of the Red Giant Branch, the Cepheid luminosity, the luminosity of type Ia supernovae, the surface brightness fluctuation method and the Tully–Fisher relation. Attention was paid to some observational biases affecting the Hubble flow around Virgo. We estimate the radius of the zero-velocity surface for the Virgo cluster to be within 5.0–7.5 Mpc, corresponding to 17–26° at the mean cluster distance of 17.0 Mpc. In the case of spherical symmetry with the cosmological parameter Ωm= 0.24 and the age of the Universe T0= 13.7 Gyr, it yields the total mass of the Virgo cluster to be within MT= (2.7–8.9) × 1014 M in reasonable agreement with the existing virial mass estimates for the cluster.

Keywords: galaxies: clusters: individual: Virgo; dark matter

Journal Article.  5554 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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