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| Paper: |
Spitzer Observations of High Redshift Radio Galaxies |
| Volume: |
381, The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution |
| Page: |
398 |
| Authors: |
Seymour, N.; Stern, D.; De Breuck, C.; Vernet, J.; Fosbury, R.; Rettura, A.; Zirm, A.; Rocca-Volmerange, B.; Lacy, M.; Teplitz, H.; Dey, A.; Dickinson, M.; van Breugel, W.; Miley, G.; Röttgering, H.; Eisenhardt, P.; McCarthy, P.; De Breuck, F.; Vernet, L. |
| Abstract: |
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 1011−12M⊙. The mean stellar mass remains constant at 1011.5M⊙ 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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