Article Dans Une Revue The Astrophysical Journal Année : 2002

The Gravitational Lens CFRS 03.1077

Résumé

An exquisite gravitational arc with a radius of 2.1" has been discovered around the z=0.938 field elliptical galaxy CFRS 03.1077 during HST observations of Canada-France Redshift Survey (CFRS) fields. Spectroscopic observations of the arc show that the redshift of the resolved lensed galaxy is z=2.941. This gravitational lens source system is well fitted using the position angle and ellipticity derived from the visible matter distribution and an isothermal mass profile with a mass corresponding to sigma=387 /-5 km s<SUP>-1</SUP>. Surprisingly, given the evidence for passive evolution of elliptical galaxies, this is in good agreement with an estimate based on the fundamental plane for z=0 ellipticals. This, perhaps, indicates that this galaxy has not shared in the significant evolution observed for average elliptical galaxies at z~1. A second elliptical galaxy with similar luminosity from the CFRS survey, CFRS 14.1311 at z=0.807, is also a lens, but in this case the lens model gives a much smaller mass-to-light ratio; i.e., it appears to confirm the expected evolution. This suggests that this pair of field elliptical galaxies may have very different evolutionary histories, which would be a significant result if confirmed. Clearly, CFRS 03.1077 demonstrates that these ``Einstein rings'' are powerful probes of high-redshift galaxies. Based on observations with the NASA/ESA Hubble Space Telescope obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy Inc., under NASA contract NAS 5-26555.

Dates et versions

hal-03785625 , version 1 (23-09-2022)

Identifiants

Citer

David Crampton, David Schade, François Hammer, A. Matzkin, S. J. Lilly, et al.. The Gravitational Lens CFRS 03.1077. The Astrophysical Journal, 2002, 570, pp.86-91. ⟨10.1086/339741⟩. ⟨hal-03785625⟩
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