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2014MNRAS.439.1270R - Mon. Not. R. Astron. Soc., 439, 1270-1285 (2014/April-1)
Hubble Space Telescope and Spitzer point-source detection and optical extinction in powerful narrow-line radio galaxies.
RAMIREZ E.A., TADHUNTER C.N., DICKEN D., ROSE M., AXON D., SPARKS W. and PACKHAM C.
Abstract (from CDS):
We find that the point-like nucleus detection rate increases from 25 per cent at 1.025 µm, to 80 per cent at 2.05 µm, and to 100 per cent at 8.0 µm. This supports the idea that most NLRG host an obscured AGN in their centre. We estimate the extinction from the obscuring structures using X-ray, near-IR and mid-IR data. We find that the optical extinction derived from the 9.7 µm silicate absorption feature is consistently lower than the extinction derived using other techniques. This discrepancy challenges the assumption that all the mid-infrared emission of NLRG is extinguished by a simple screen of dust at larger radii. This disagreement can be explained in terms of either weakening of the silicate absorption feature by (i) thermal mid-IR emission from the narrow-line region, (ii) non-thermal emission from the base of the radio jets, or (iii) by direct warm dust emission that leaks through a clumpy torus without suffering major attenuation.
Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)
Journal keyword(s): galaxies: active - galaxies: nuclei - infrared: galaxies
Simbad objects: 14
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