SIMBAD references

2005ApJ...620L..83H - Astrophys. J., 620, L83-L86 (2005/February-3)

The fundamental plane of cluster elliptical galaxies at z=1.25.

HOLDEN B.P., VAN DER WEL A., FRANX M., ILLINGWORTH G.D., BLAKESLEE J.P., VAN DOKKUM P., FORD H., MAGEE D., POSTMAN M., RIX H.-W. and ROSATI P.

Abstract (from CDS):

Using deep Hubble Space Telescope Advanced Camera for Surveys imaging and Very Large Telescope FOcal Reducer/low dispersion Spectrograph 2 spectra, we determined the velocity dispersions, effective radii, and surface brightnesses for four early-type galaxies in the z=1.237 cluster RDCS 1252.9-2927. All four galaxies are massive, greater than 1011 M. These four galaxies, combined with three from RDCS 0848+4453 at z=1.276, establish the fundamental plane of massive early-type cluster galaxies at z{d1}=1.25. The offset of the fundamental plane shows that the luminosity evolution in rest-frame B is ΔlnM/LB=(-0.98±0.06)z for galaxies with M>1011.5 M. To reproduce the observed mass-to-light ratio (M/L) evolution, we determine the characteristic age of the stars in these M>1011.5 Mgalaxies to be 3.0+0.3–0.3Gyr; i.e., z*=3.4+0.5–0.4. Including selection effects caused by morphological bias (the ``progenitor bias''), we estimate an age of 2.1+0.2–0.2Gyr, or z*=2.3+0.2–0.2for the elliptical galaxy population. Massive cluster early-type galaxies appear to have a large fraction of stars that formed early in the history of the universe. However, there is a large scatter in the derived M/L values, which is confirmed by the spread in the galaxies' colors. Two lower mass galaxies in our z{d1}=1.25 sample have much lower M/L values, implying significant star formation close to the epoch of observation. Thus, even in the centers of massive clusters, there appears to have been significant star formation in some massive, M≃1011 M, galaxies at z≃1.5.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: General - Galaxies: Clusters: Individual: Alphanumeric: RDCS 1252.9-2927 - Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution - Galaxies: Fundamental Parameters - Galaxies: Photometry

Nomenclature: Fig.1 et Table 1: [HVF2005] NNNN N=4.

Simbad objects: 10

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