Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.139t&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Virgo cluster plays a dominant role for the extragalactic distance scale. It is one of the very few clusters whose member galaxies have been identified to very faint limits. The cluster ellipticals and spirals constitute therefore, in terms of the statistician, a complete, volume-limited sample, which is immune against selection (Malmquist) bias. The cluster is in addition tightly tied to the large-scale expansion field through relative distances to more distant clusters. - So far only three bona fide Virgo members have Cepheid distances; due to the considerable depth effect of the cluster they vary between 17 and 25 Mpc. However, supernovae of type Ia, 21;cm;-;line widths, the D_n- sigma method, globular clusters, and novae give independent distance determinations which lead to a consistent mean distance modulus of (m-M) = 31.60 +- 0.09 (20.9 +- 0.9 Mpc).
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