The luminosity-velocity diagram - A new distance estimator for spiral galaxies

Details The luminosity-velocity diagram - A new distance estimator for spiral galaxies The luminosity-velocity diagram - A new distance estimator for spiral galaxies

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323l..25m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. L25-L29.

Astronomy and Astrophysics

Astrophysics

3

Astronomical Photometry, Galactic Rotation, Spiral Galaxies, Stellar Luminosity, Error Analysis, Galactic Structure

Scientific paper

Evidence is presented for a newly identified feature of the inner regions of disk galaxies which appears to show promise as a new distance indicator. For a sample of 46 galaxies, found moving out from their centers, Delta M(r)/Delta log V(r) = about -3.30 (+ or - 0.40), where M(r) is the cumulative interior magnitude and V(r) is the local rotation rate. The stability of this slope (+ or - 12 percent) in turn suggets that such a feature might also be worth investigating further for stability in zero point, since the combination of velocity predicting luminosity is a classic means of distance determination.

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