Old elliptical galaxies at z ~= 1.5 and the Kormendy relation

I. Waddington, R. A. Windhorst, S. H. Cohen, James Dunlop, John Peacock, R. Jimenez, R. J. McLure, A. J. Bunker, H. Spinrad, A. Dey, D. Stern

Research output: Contribution to journalArticlepeer-review

Abstract

Deep spectroscopy of the two Leiden-Berkeley Deep Survey mJy radio galaxies LBDS 53W069 and 53W091 has previously shown them to have old (>~3 Gyr) stellar populations at z~= 1.5. Here we present the results of Hubble Space Telescope (HST) observations with the Wide Field and Planetary Camera 2 (WFPC2) in F814W and with the Near-Infrared Camera and Multi-Object Spectrograph (NICMOS) in F110W. We find that 53W069 has a de Vaucouleurs r1/4 profile in both the F814W and F110W data, with a mean effective radius of 0.30 +/- 0.06 arcsec (2.7 +/- 0.5 kpc). The rest-frame U-B colour gradient is consistent with that of present-day ellipticals, requiring a stellar population of supersolar (3 Zsolar) metallicity that formed on a very short time-scale at high redshift (z > 5). 53W091 has a regular r1/4 profile in F110W with an effective radius of 0.32 +/- 0.08 arcsec (2.9 +/- 0.7 kpc). The F814W profile is more extended and is consistent with the presence of a blue exponential disc that contributes 20 +/- 10 per cent of the flux within re. We find a rest-frame U-B colour gradient that is significantly larger than that observed in field ellipticals at z
Original languageEnglish
Pages (from-to)1342-1350
JournalMonthly Notices of the Royal Astronomical Society
Volume336
DOIs
Publication statusPublished - 1 Nov 2002

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