Orientation Effects in the Spectral Energy Distributions of High-z 3CRR Sources Including New Far-IR Herschel Data.

Details Orientation Effects in the Spectral Energy Distributions of High-z 3CRR Sources Including New Far-IR Herschel Data. Orientation Effects in the Spectral Energy Distributions of High-z 3CRR Sources Including New Far-IR Herschel Data.

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812301k&link_type=abstract

American Astronomical Society, AAS Meeting #218, #123.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

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A critical problem in understanding AGN and their contribution to the accretion power of the Universe is deducing their intrinsic properties from the observed properties, which are highly orientation/obscuration dependent. One way to select AGN samples that are unbiased by the effects of orientation/obscuration is low-frequency radio emission. Here we study a complete, 178 MHz radio flux-limited, orientation unbiased sample of 3CRR sources with high-redshift (1 < z < 2). At these redshifts the radio luminosities of the 3CRR sources are high ensuring that all sources in the sample are AGN. The sample includes 20 quasars and 18 radio galaxies, thought to be AGN viewed edge-on according to unification models. The estimate of orientation is provided by the radio core dominance. We have begun studies of the Chandra X-ray and Spitzer IR properties and their dependence on orientation. Here we extend these studies by compiling full (radio-to-X-ray) spectral energy distributions (SEDs)complementing the Chandra and Spitzer data with existing data from the literature and astronomical databases. Until recently one crucial gap remained in our multi-wavelength SED coverage: the far-infrared, which is emitted by dust and is key to measuring star formation in our sources. ESA's newly operating `cornerstone' mission, Herschel, is the first observatory to cover the 60-670um (observed frame) range. We show for the first time the full SEDs of the high-z 3CRR sources
including the new, complementary Herschel data. We present preliminary results of our study of the dependence of the SEDs on orientation (the 3CRR sources span a full range of inclination angles) and disentangle orientation effects from other effects (such as e.g. accretion rate).

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