The galaxy as a basic standard for extragalactic distances. V - Another decisive test on long and short scales: the distance to the Virgo cluster and its implications

Details The galaxy as a basic standard for extragalactic distances. V - Another decisive test on long and short scales: the distance to the Virgo cluster and its implications The galaxy as a basic standard for extragalactic distances. V - Another decisive test on long and short scales: the distance to the Virgo cluster and its implications

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982crasb.294.1131d&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II - Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Ter

Astronomy and Astrophysics

Astronomy

1

Astronomical Coordinates, Celestial Reference Systems, Milky Way Galaxy, Virgo Galactic Cluster, Brightness, Cepheid Variables, Distance, Globular Clusters, Hubble Constant

Scientific paper

The usefulness of a short length scale for extragalactic distances and the impossibility of establishing a long scale of measurement are demonstrated through comparisons of distance projections for the Virgo E cluster of galaxies. Measurements of distance based on luminosity functions for the Virgo E cluster show the cluster to be of 23.3 magnitude, while the short scale predicts a 30.37 and the long scale a 31.76 magnitude. Differences in magnitude between globular clusters and their RR Lyr type variable stars have been calculated to be 0.8, with the short scale yielding a 0.78 figure and the long scale 0.46. The short scale sets the galactocentric distance at 8.4 kpc and the long scale predicts 15.2 kpc, with previous estimates indicating an 8.5 kpc distance. The short scale is concluded to be accurate to within 0.1-0.2 mag and to serve as evidence for the validity of the Hubble constant at 95.

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