The distance scale - Present status and future prospects

Details The distance scale - Present status and future prospects The distance scale - Present status and future prospects

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303....1a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 1-9.

Other

60

Astrometry, Big Bang Cosmology, Distance, Galactic Rotation, Hubble Constant, Luminosity, Cepheid Variables, Hubble Space Telescope, Infrared Radiation, Scale (Ratio), Supergiant Stars, Supernovae

Scientific paper

The Hubble constant is arguably the single most important quantity in observational cosmology. Unfortunately, after more than half a century of intensive study, the value of H0 obtained via calibration of the extragalactic distance scale remains a source of tremendous controversy. Currently the best global distance indicator appears to be the relation between galaxian infrared luminosity and rotation speed as measured by the velocity width of the 21 cm profile. Results obtained to date from exploitation of the IR/H I relation are summarized. Correction for all velocity deviation leads to a high value (H0 ≈ 90 km s-1Mpc-1) for the expansion rate. The principal uncertainty in this result (or any other current estimate for the Hubble constant) remains calibration of the local distance scale.

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