HST Imaging of an Old Galaxy Group at z=1.55

Details HST Imaging of an Old Galaxy Group at z=1.55 HST Imaging of an Old Galaxy Group at z=1.55

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.5407b&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #54.07; Bulletin of the American Astronomical Society, Vol. 33, p.865

Astronomy and Astrophysics

Astronomy

Scientific paper

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 (1.6μ m) 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' r1/4 law, with a scale length of re=0.3'' (2.3 h70-1 kpc for Ω M=0.3 and Ω Λ =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.

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