The Infrared D -- sigma Relation of Elliptical Galaxies

Details The Infrared D -- sigma Relation of Elliptical Galaxies The Infrared D -- sigma Relation of Elliptical Galaxies

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5217g&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #52.17; Bulletin of the American Astronomical Society, Vol. 26, p.1401

Astronomy and Astrophysics

Astronomy

Scientific paper

A popular method for estimating distances to elliptical galaxies relies on the correlation between diameter and the central velocity dispersion. The diameters are usually defined as the size of a circular aperture within which an elliptical has a certain surface brightness, 20.75mag/sq.arcsec in B or 19.80 in V, the two most commonly used bands. The scatter in the D--sigma relation of the Coma cluster is reduced by a factor of ~ 1.5-2 if near infrared photometry is used instead. This improvement is comparable to that of B band D--sigma over the Faber-Jackson relation (B_T {em vs}. sigma ) and represents a further increase in the accuracy of estimated distances. The infrared relation is better because, in the Coma cluster at least, V-K is an alternative and possibly superior parameter to surface brightness in fundamental plane formulations, effectively collapsing the fundamental plane to a line.

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