Astronomy and Astrophysics, volume 355, 835-847 (2000/3-3)
Investigations of the Local Supercluster velocity field. III. Tracing the backside infall with distance moduli from the direct Tully-Fisher relation.
EKHOLM T., LANOIX P., TEERIKORPI P., FOUQUE P. and PATUREL G.
Abstract (from CDS):
We have extended the discussion of Paper II (Ekholm et al., 1999A&A...351..827E
) to cover also the backside of the Local Supercluster (LSC) by using 96 galaxies within Θ<30° from the adopted centre of LSC and with distance moduli from the direct B-band Tully-Fisher relation. In order to minimize the influence of the Malmquist bias we required logVmax
>2.1 and σBT
<0.2mag. We found out that if RVirgo
<20Mpc this sample fails to follow the expected dynamical pattern from the Tolman-Bondi (TB) model. When we compared our results with the Virgo core galaxies given by Federspiel et al. (1998ApJ...495..115F
) we were able to constrain the distance to Virgo: RVirgo
=20-24Mpc. When analyzing the TB-behaviour of the sample as seen from the origin of the metric as well as that with distances from the extragalactic Cepheid PL-relation we found additional support to the estimate RVirgo
=21Mpc given in Paper II. Using a two-component mass-model we found a Virgo mass estimate MVirgo
, where M
=21Mpc. This estimate agrees with the conclusion in Paper I (Teerikorpi et al., 1992A&A...260...17T
). Our results indicate that the density distribution of luminous matter is shallower than that of the total gravitating matter when q0
≤0.5. The preferred exponent in the density power law, α≃2.5, agrees with recent theoretical work on the universal density profile of dark matter clustering in an Einstein-deSitter universe (Tittley & Couchman, 1999, in press).
cosmology: theory - cosmology: dark matter - cosmology: distance scale - galaxies: distances and redshifts - galaxies: general - galaxies: kinematics and dynamics
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