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HST Imaging of a z=1.55 Old Galaxy Group | | Andrew Bunker
; Hyron Spinrad
; Ross McLure
; Arjun Dey
; James Dunlop
; John Peacock
; Daniel Stern
; Rodger Thompson
; Ian Waddington
; Rogier Windhorst
; | | Date: |
16 May 2002 | | Subject: | astro-ph | | Affiliation: | 1 and 2), Hyron Spinrad , Ross McLure (3 and 4), Arjun Dey , James Dunlop , John Peacock , Daniel Stern (2 and 6), Rodger Thompson , Ian Waddington (8 and 9) and Rogier Windhorst ( Institute of Astronomy, Cambridge, Berkeley, Oxford, Edinburgh, K | | Abstract: | We present high-resolution imaging in the rest-frame optical of the weak radio source LBDS53W091. Previous optical spectroscopy has shown that this object has an evolved stellar population of age >3Gyr at z=1.55, determined from the amplitude of rest-frame UV spectral breaks. We have obtained deep Hubble Space Telescope imaging over 10 orbits with NICMOS camera 2, using the F160W H-band filter (1.6microns) which is a good approximation to the rest-frame R-band. Our observations reveal a radial light profile which is well fit by a de Vaucouleurs’ r^{1/4} law, with a scale length of r_e=0.3" (3kpc/h_{50} for Omega_M=0.3 and Omega_{Lambda}=0). The elliptical morphology of the radio galaxy indicates a dynamically-evolved old system, consistent with the spectroscopic results. Some surrounding objects lie on the color:magnitude relation for a cluster at z=1.55, and are likely to be associated. The group of galaxies are somewhat more luminous than the fundamental plane of ellipticals at z=0 subject to (1+z)^4 surface brightness dimming, but are consistent with estimates of the fundamental plane at high redshift subject to passive luminosity evolution from a formation epoch of z>3. | | Source: | arXiv, astro-ph/0205239 | | Services: | Forum | Review | PDF | Favorites | |
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