High redshift, low luminosity radio galaxies in the NDWFS Bootes and Spitzer FLS fields

Details High redshift, low luminosity radio galaxies in the NDWFS Bootes and Spitzer FLS fields High redshift, low luminosity radio galaxies in the NDWFS Bootes and Spitzer FLS fields

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20727v&link_type=abstract

Spitzer Proposal ID #20727

Computer Science

Scientific paper

The identification fraction of IRAC sources in the `Shallow' surveys of the Bootes NDWFS and the First Look Survey field of moderately bright, 1 - 10 mJy level, radio sources drops significantly for 92 cm - 21 cm steep spectrum sources. Keck K-band observations of a handful of such sources show that 2/3 have K ~ 21 - 22, `classic', fuzzy high redshift radio galaxy (HzRG) morphologies. We propose to obain deep IRAC identifications of a sample of such steep spectrum selected HzRG candidates which are marginally or un-detected at 3.6 micron. We expect that perhaps as many as half of these will be HzRGs at z > 3, with luminosities 10 - 100 lower and co-moving volume densities more than 1000 larger than the extremely luminous HzRGs known to date. This will make it possible, for the first time, to get a complete census of the radio source population (galaxies, starbursts, and quasars) in well studied fields that also includes high redshift radio galaxies. This will not only help us better understand the formation and evoution of these galaxies and their AGN, but also may allow us to search for proto-cluster overdensities, and study their galaxy populations, selected at less extreme radio luminosities than has been possible before.

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