Near-Infrared Imaging of a Group or Cluster of Galaxies at a Redshift of 2.39

Details Near-Infrared Imaging of a Group or Cluster of Galaxies at a Redshift of 2.39 Near-Infrared Imaging of a Group or Cluster of Galaxies at a Redshift of 2.39

1998-01-15

arxiv.org/abs/astro-ph/9801149v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, LaTeX, uses paspconf.sty and epsf.sty. To be published in "The Young Universe: Galaxy Formation and Evolut

Scientific paper

At z=2.39, the cluster around 53W002 is one of the most distant groups or clusters of galaxies known to date. At this redshift the 4000A-break falls between the J and H bands, thus our infrared observations are designed to identify cluster members by a red J-H colour. Out of the 42 objects we have detected in the field, we find ten galaxies with J-H>1.0 and K>18.8, redder and fainter than the radio galaxy, and consistent with the presence of a 4000A-break at the cluster redshift. Two of these reddest galaxies have been confirmed spectroscopically. The colours, sizes and location of these infrared-selected galaxies suggest a cluster much more similar to those nearby than revealed by Hubble Space Telescope observations alone.

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