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A More Fundamental Plane

A More Fundamental Plane

Authors :
Léon V. E. Koopmans
Leonidas A. Moustakas
Adam S. Bolton
Scott Burles
Tommaso Treu
Kapteyn Astronomical Institute
Source :
Astrophysical Journal, 665(2), L105-L108. IOP PUBLISHING LTD
Publication Year :
2007
Publisher :
arXiv, 2007.

Abstract

We combine strong-lensing masses with SDSS stellar velocity dispersions and HST-ACS effective (half-light) radii for 36 lens galaxies from the Sloan Lens ACS (SLACS) Survey to study the mass dependence of mass-dynamical structure in early-type galaxies. We find that over a 180--390 km/s range in velocity dispersion, structure is independent of lensing mass to within 5%. This result suggests a systematic variation in the total (i.e., luminous plus dark matter) mass-to-light ratio as the origin of the tilt of the fundamental plane (FP) scaling relationship between galaxy size, velocity dispersion, and surface brightness. We construct the FP of the lens sample, which we find to be consistent with the FP of the parent SDSS early-type galaxy population, and present the first observational correlation between mass-to-light ratio and residuals about the FP. Finally, we re-formulate the FP in terms of surface mass density rather than surface brightness. By removing the complexities of stellar-population effects, this mass-plane formulation will facilitate comparison to numerical simulations and possible use as a cosmological distance indicator.<br />Comment: 4+epsilon pages, 1 figure, emulateapj. Revised version accepted for publication in the ApJ Letters

Details

ISSN :
0004637X
Database :
OpenAIRE
Journal :
Astrophysical Journal, 665(2), L105-L108. IOP PUBLISHING LTD
Accession number :
edsair.doi.dedup.....57e3bfd6c37cc3dabbc1803eb6c9f42d
Full Text :
https://doi.org/10.48550/arxiv.astro-ph/0701706