The H-alpha velocity widths of giant H II regions as distance indicators

Details The H-alpha velocity widths of giant H II regions as distance indicators The H-alpha velocity widths of giant H II regions as distance indicators

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..579r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 15, 1986, p. 579-584. Research supported by the Ministere de l'E

Astronomy and Astrophysics

Astrophysics

10

Astrometry, Distance, H Alpha Line, H Ii Regions, Correlation Coefficients, Diameters, Magnitude

Scientific paper

The mean velocity widths (MVW) of the H-alpha line profiles of the largest giant H II regions in 10 or more galaxies are compared with the mean diameters (MD) of the same H II regions to evaluate the relative merits of MD and MVW as distance indicators. Diagrams of relations M(B) versus log D and M(B) versus log W are constructed using distance parameters from Sandage and Tammann (1981) and from de Vaucouleurs (1979). It is shown that the mean velocity widths deduced from integrated H-alpha line profiles correlate more strongly with the absolute magnitudes of galaxies than the mean diameters of the three largest H II regions; this also holds when isophotal diameters of H II regions are used. Absolute magnitudes and distance moduli of de Vaucouleurs give statistically more significant relationships than the distance parameters of Sandage and Tammann.

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