Can the Hubble constant be determined from H II region diameters

Details Can the Hubble constant be determined from H II region diameters Can the Hubble constant be determined from H II region diameters

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235....1v&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Jan. 1, 1980, p. 1-3.

Astronomy and Astrophysics

Astrophysics

12

H Ii Regions, Hubble Constant, Interstellar Gas, Diameters, Galaxies, Hydrogen Ions, Luminosity, Nebulae

Scientific paper

Recently published distances to nearby galaxies and isophotometric H II region diameters are used in an attempt to strengthen the local calibration of the galaxy luminosity versus H II region diameter correlation. It is shown that the best presently available data base yields a value of the Hubble constant, determined from the mean isophotal diameter alone, that is uncertain by approximately 40%. It is concluded that the method which Sandage and Tammann (1974) used to derive the scale size of the universe derives most of its weight from DDO luminosity classifications rather than from H II region diameter measurements and depends critically on the assumption that luminosity classifications of galaxies do not contain distance-dependent systematic errors.

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