Velocity dispersions in H II regions as distance indicators

Details Velocity dispersions in H II regions as distance indicators Velocity dispersions in H II regions as distance indicators

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79..274d&link_type=abstract

Astronomy and Astrophysics, vol. 79, no. 3, Nov. 1979, p. 274-276.

Astronomy and Astrophysics

Astrophysics

20

Galactic Rotation, Galaxies, H Ii Regions, Astronomical Photometry, Velocity Distribution

Scientific paper

The correlation between mean turbulent velocity dispersions in the largest H II regions of late-type galaxies and absolute magnitude of the parent galaxy is reformulated. Revised distance moduli (previously derived from primary and secondary indicators by the Vaucouleurs, 1978a,b) are used, as well as a corrected absolute magnitude on the BT system equal to -13.7 log Vt + (0.00 plus or minus 0.14). The (internal) standard deviation is 0.37 mag, confirming the usefulness of this new distance indicator. A less tight correlation with galaxy diameters is also indicated.

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