Giant H II regions as distance indicators. II - Application to H II galaxies and the value of the Hubble constant

Details Giant H II regions as distance indicators. II - Application to H II galaxies and the value of the Hubble constant Giant H II regions as distance indicators. II - Application to H II galaxies and the value of the Hubble constant

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.235..297m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 235, Nov. 15, 1988, p. 297-313.

Astronomy and Astrophysics

Astronomy

78

Dwarf Galaxies, H Ii Regions, Hubble Constant, Angular Velocity, Emission Spectra, H Beta Line, Local Group (Astronomy), Red Shift, Virgo Galactic Cluster

Scientific paper

The (integrated) Hβ luminosities of giant H II regions and of H II galaxies can be predicted with an accuracy comparable to the observational errors from the velocity widths of their emission-line profiles and the nebular oxygen abundances. The zero point of the correlation between these parameters is calibrated using the homogeneous sample of giant H II regions in nearby galaxies with well determined distances discussed in the first paper of this series. The calibration is applied to distant H II galaxies to obtain a value for Hubble's constant H0. The authors find H0 = 89±10 km s-1Mpc-1. From four H II galaxies in the Virgo cluster, a true distance modulus of (m-M)vir = 30.9±0.15 is obtained for that cluster. The effects of the large-scale inhomogeneities in the Hubble flow shown to exist by Dressler et al. (1987) are emphasized. A detailed discussion of possible systematic errors is presented.

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