High Redshift Radio Galaxies, the Most Massive Galaxies at Every Epoch

Details High Redshift Radio Galaxies, the Most Massive Galaxies at Every Epoch High Redshift Radio Galaxies, the Most Massive Galaxies at Every Epoch

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..13d&link_type=abstract

Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #13

Astronomy and Astrophysics

Astrophysics

Scientific paper

Radio galaxies are excellent tracers of the most massive galaxies known out to z>5. This has been confirmed by our recent Spitzer observations of their rest-frame near-IR emission. Studies of their Mpc-scale environments have shown that they are often located in dense proto-clusters. The most distant (z>3) radio galaxies are almost exclusively found by selecting ultra steep spectrum (USS) radio sources from low-frequency radio surveys (WENSS, Texas, SUMSS and NVSS). This empirical USS selection technique has been explained by shifting of the steeper high-frequency tail into the passbands of large low frequency radio surveys. A new alternative explanation suggests the steeper spectra can also be explained by pressure confinement of the radio lobes in the denser environments at high redshifts. Future long wavelength surveys will contain a large fraction of distant radio galaxies, but the difficulty will be to obtain spectroscopic redshifts, which to date has been possible only with deep optical spectroscopy. However, the large bandwidth spectroscopic capabilities of future long-wavelength radio telescopes such as LOFAR and SKA may allow a direct redshift determination in the radio domain using the redshifted associated HI 21cm absorption and the "HI forest" absorption caused by foreground systems.

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