The Hubble constant as derived from 21 CM linewidths

Details The Hubble constant as derived from 21 CM linewidths The Hubble constant as derived from 21 CM linewidths

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.307..326s&link_type=abstract

Nature (ISSN 0028-0836), vol. 307, Jan. 26, 1984, p. 326-329. Research supported by the Swiss National Science Foundation.

Astronomy and Astrophysics

Astronomy

75

Astrometry, Centimeter Waves, Hubble Constant, Spectral Line Width, Virgo Galactic Cluster, Distance, Globular Clusters, Magnitude, Spiral Galaxies

Scientific paper

The IR 21 cm linewidth-absolute magnitude relation is calibrated by means of local galaxies with known distances, including new distance determinations of M33 and M81. The calibrated relation is applied to 17 Virgo cluster galaxies of type Sab to Sd and yields a cluster modulus of (m-M)0Virgo = 31.47±0.34. Reliable relative distance indicators are used to extend the distance scale to the Coma cluster, for which a distance modulus is found of (m-M)0Coma = 35.39±0.35. The blue 21 cm linewidth-absolute magnitude relation gives slightly larger distances. A combination of the two methods leads to a Hubble constant at the distance of the Coma cluster of H0 = 55±9 km s-1 Mpc-1. This value agrees with the global value of H0 = 50±7 km s-1 Mpc-1.

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