Spitzer Space Telescope - General Observer Proposal #20651


The low-redshift 3CRR sources:  missing data

Principal Investigator: Mark Birkinshaw
           Institution: University of Bristol

Co-Investigators: 
Peter Barthel, University of Groningen                                
Paul Green, Smithsonian Institution Astrophysical Observatory         
Dean Hines, University of Arizona                                     
Eric Hooper, University of Texas                                      
Charles Lawrence, Jet Propulsion Laboratory                           
Howard Smith, Smithsonian Institution Astrophysical Observatory       
Ilse van Bemmel, Space Telescope Science Institute                    
Belinda Wilkes, Smithsonian Institution Astrophysical Observatory     
Steve Willner, Smithsonian Institution Astrophysical Observatory      
Diana Worrall, Smithsonian Institution Astrophysical Observatory      

Science Category: AGN/quasars/radio galaxies 
 Observing Modes: MipsPhot 
  Hours Approved: 1.2 

Abstract:
We propose MIPS observations of 3C 338 to conclude the program of IRAC
and MIPS imaging photometry of the complete sample of z < 0.1 3CRR
radio galaxies that was awarded time in AO1.  These MIPS observations
were expected from a GTO program, but are no longer in the ROC.  The
overall aims of the study are (1) to measure the energy outputs of the
active nuclei and test the relationship between radio power and
nuclear properties expected under unified schemes;  (2) to study
orientation effects in the IR emission of the nuclei by comparing
their IR properties with radio-derived indications of orientation;
(3) to confirm the unusual IR colors of the host galaxies, which we
interpret in terms of dusty debris from a recent encounter;  and (4)
to construct wide-band spectra for the radio jets, and so test our
prediction of spectral breaks in the mid-IR arising from the existence
of a maximum electron energy.  The data received so far confirm the
feasibility of this program, and we wish to obtain the 3C 338 MIPS
images since this is one of the few cD galaxies in the sample at the
core of an X-ray bright cluster, and to avoid compromising the legacy
value of the overall dataset.