Deviations from the Fundamental Plane and Implications for Cluster Peculiar Velocities

Details Deviations from the Fundamental Plane and Implications for Cluster Peculiar Velocities Deviations from the Fundamental Plane and Implications for Cluster Peculiar Velocities

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.3812g&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #38.12; Bulletin of the American Astronomical Society, Vol. 30, p.1303

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have fit the fundamental plane (FP) to elliptical galaxies in 20 nearby clusters (cz ~ 4000-11000 km s(-1) ), using our own photometry and spectroscopy as well as measurements culled from the literature. We find that the goodness-of-fit to an average fundamental plane (/line{FP}) varies by more than a factor of two between these clusters. The sample is distinctly bimodal in r.m.s.;: about half the clusters fit the /line{FP} well, 0.05 < r.m.s.[log(sigma )]< 0.06, while the rest do not, 0.08 < r.m.s.[log(sigma )]< 0.11. The clusters with low scatter about the /line{FP} are found to be at rest with respect to the cosmic microwave background (CMB) within our measurement errors ( ~ 250 km s(-1) ). Only poor-fit clusters show large peculiar velocities (PV's), implying inaccurate measurement, rather than true indications of large peculiar motions. Furthermore, we find that all x-ray bright clusters in our sample fit the /line{FP} well, suggesting that in the most massive, virialized clusters the ellipticals form a more uniform sample.

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