The Galaxy Population of Cluster RXJ0848+4453 at z=1.27

Details The Galaxy Population of Cluster RXJ0848+4453 at z=1.27 The Galaxy Population of Cluster RXJ0848+4453 at z=1.27

2001-04-16

arxiv.org/abs/astro-ph/0104261v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in The Astrophysical Journal Letters

Scientific paper

10.1086/320335

We present a study of the galaxy population in the cluster RXJ0848+4453 at z=1.27, using deep HST NICMOS and WFPC2 images. We morphologically classify all galaxies to K_s=20.6 that are covered by the HST imaging, and determine photometric redshifts using deep ground based BRIzJK_s photometry. Of 22 likely cluster members with morphological classifications, eleven (50%) are classified as early-type galaxies, nine (41%) as spiral galaxies, and two (9%) as ``merger/peculiar''. At HST resolution the second brightest cluster galaxy is resolved into a spectacular merger between three red galaxies of similar luminosity, separated from each other by ~6 kpc, with an integrated magnitude K=17.6 (~3 L* at z=1.27). The two most luminous early-type galaxies also show evidence for recent or ongoing interactions. Mergers and interactions between galaxies are possible because RXJ0848+4453 is not yet relaxed. The fraction of early-type galaxies in our sample is similar to that in clusters at 0.5

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