Near-IR Studies of High Redshift Radio Galaxies

Details Near-IR Studies of High Redshift Radio Galaxies Near-IR Studies of High Redshift Radio Galaxies

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...63v&link_type=abstract

NOAO Proposal ID #1999A-0063

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Scientific paper

The near-IR Hubble K-z diagram of powerful radio galaxies is an important tool to study the formation and evolution of massive galaxies from the protogalaxy stage to the present. Previous CIRIM observations of an unique sample of `Ultra Steep Spectrum' (USS) radio sources resulted in the near-IR identification of 18 massive galaxy candidates. 12% of the objects were at K ~lt 18, 66% at 18 < K < 19, and 22% at K ~gt 19, with expected redshifts of z < 1.3, 1.3 < z < 2.6, and z > 2.6. We propose to continue this identification program which is based on pure radio and near-IR selection. It does not depend on an optical detection or color `drop-out' measurement, as required by most other high z galaxy searches. Our identifications are therefore not restriced to narrow redshift ranges and are not subject to strong extinction or reddening effects which are known to be important at high redshifts. These observations will lay the necessary groundwork for building a sample of massive forming galaxies and their environment for future follow-up spectroscopy and multi-color studies.

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