IR Surface Brightness Fluctuations of Fornax and Coma Cluster Ellipticals

Details IR Surface Brightness Fluctuations of Fornax and Coma Cluster Ellipticals IR Surface Brightness Fluctuations of Fornax and Coma Cluster Ellipticals

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.153l&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present results from a program to measure K-band surface brightness fluctuations (SBFs) of elliptical galaxies. Unlike many cosmological distance indicators, SBF measurements are appealing because they have a well-understood physical basis. SBFs in ellipticals are dominated by late-type stars so IR work can potentially measure distances 2-3 times as far as optical SBF. We are using Fornax cluster galaxies to calibrate the K-band SBF zeropoint, to measure second parameter effects and the intrinsic dispersion, and to test the latest stellar population models. We also have detected IR SBFs of Coma cluster ellipticals using the 10-meter Keck Telescope and discuss prospects for distance measurements out to ~100 h^{-1} Mpc and, consequently, a determination of the Hubble Constant uncontaminated by local peculiar velocities.

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