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Published 2008 | Published
Book Section - Chapter Open

Spitzer Observations of High Redshift Radio Galaxies


We present the results of a comprehensive Spitzer survey of 70 radio galaxies across 1 < z < 5.2. Using IRAC, IRS and MIPS imaging we determine the rest-frame AGN contribution to the stellar emission peak at 1.6μm. The stellar luminosities are found to be consistent with that of a giant elliptical with a stellar mass of 10^(11−12)M_⊙. The mean stellar mass remains constant at 10^(11.5)M_⊙ up to z = 3 indicating that the upper end of the mass function is already in place at redshift 3. The mid-IR luminosities imply bolometric IR luminosities that would classify most sources as ULIRGs. The mid-IR to radio luminosity generally correlate implying a common origin for these emissions. The ratio is higher than that found for lower redshift, i.e. z < 1, radio galaxies.

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© 2008 Astronomical Society of the Pacific. We thank the LOC for organising a great conference and were particularly impressed by the nifty design of the webpage. We also liked Harry's conference haircut.

Attached Files

Published - Seymour2008p8616Second_Annual_Spitzer_Science_Center_Conference_Infrared_Diagnostics_Of_Galaxy_Evolution.pdf



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August 19, 2023
January 12, 2024