Local velocity field from sosie galaxies. I. The Peebles' model

Details Local velocity field from sosie galaxies. I. The Peebles' model Local velocity field from sosie galaxies. I. The Peebles' model

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...393...57t&link_type=abstract

Astronomy and Astrophysics, v.393, p.57-68 (2002)

Astronomy and Astrophysics

Astrophysics

22

Galaxies: General, Galaxies: Distances And Redshifts, Cosmology: Distance Scale, Methods: Statistical

Scientific paper

Pratton et al. (1997) showed that the velocity field around clusters could generate an apparent distortion that appears as tangential structures or radial filaments. In the present paper we determine the parameters of the Peebles' model (1976) describing infall of galaxies onto clusters with the aim of testing quantitatively the amplitude of this distortion. The distances are determined from the concept of sosie galaxies (Paturel 1984) using 21 calibrators for which the distances were recently calculated from two independent Cepheid calibrations. We use both B and I-band magnitudes. The Spaenhauer diagram method is used to correct for the Malmquist bias. We give the equations for the construction of this diagram. We analyze the apparent Hubble constant in different regions around Virgo and obtain simultaneously the Local Group infall and the unperturbed Hubble constant. We found: [VLG-infall = 208 ± 9 km s-1] [\log H = 1.82 ± 0.04 (H ≈ 66 ± 6 km s-1 Mpc-1).] The front side and backside infalls can be seen around Virgo and Fornax. In the direction of Virgo the comparison is made with the Peebles' model. We obtain: [vinfall} = CVirgo/r0.9 ± 0.2] with CVirgo=2800 for Virgo and CFornax=1350 for Fornax, with the adopted units (km s-1 and Mpc). We obtain the following mean distance moduli: [μVirgo=31.3 ± 0.2 (r=18 Mpc )] [μFornax=31.7 ± 0.3 (r=22 Mpc). ] All these quantities form an accurate and coherent system. Full Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/393/57

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