A New Age-Independent Distance Indicator for Elliptical Galaxies

Details A New Age-Independent Distance Indicator for Elliptical Galaxies A New Age-Independent Distance Indicator for Elliptical Galaxies

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263l..47g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 263, NO.4/AUG15, P. L47, 1993

Astronomy and Astrophysics

Astronomy

35

Scientific paper

There is growing evidence that elliptical galaxies that are located in low-density environments have, on average, slightly younger stellar populations than do those located In high-density environments. This induces spurious positive peculiar motions as derived from the usual distance indicators. Using galaxy evolution models to correct for the effect of an intermediate-age stellar population, we design a new distance indicator for elliptical galaxies which is independent of mean stellar age. This relation allows distances to be determined with an uncertainty of ~20 per cent. When applied to Schweizer et al's sample of ellipticals with recent star formation, the large positive peculiar motions noted by Gregg are eliminated.

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