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Título

Polarized mid-infrared synchrotron emission in the core of Cygnus A

Autor López-Rodríguez, E.; Packham, Christopher; Tadhunter, Clive; Mason, R. E.; Perlman, E.; Alonso-Herrero, A. ; Ramos-Almeida, Cristina; Levenson, N.; Rodríguez-Espinosa, J. M.; Telesco, C.
Fecha de publicación 2014
EditorAmerican Astronomical Society
Institute of Physics Publishing
Citación Astrophysical Journal 793(2): 81 (2014)
ResumenThe American Astronomical Society. All rights reserved. We present high-angular (∼0.″4) resolution mid-infrared (MIR) polarimetric observations in the 8.7 μm and 11.6 μm filters of Cygnus A using CanariCam on the 10.4 m Gran Telescopio CANARIAS. A highly polarized nucleus is observed with a degree of polarization of 11% ± 3% and 12% ± 3% and a position angle of polarization of 27° ± 8°and 35°± 8°in a 0.″38 (∼380 pc) aperture for each filter. The observed rising of the polarized flux density with increasing wavelength is consistent with synchrotron radiation from the parsec-scale jet close to the core of Cygnus A. Based on our polarization model, the synchrotron emission from the parsec-scale jet is estimated to be 14% and 17% of the total flux density in the 8.7 μm and 11.6 μm filters, respectively. A blackbody component with a characteristic temperature of 220 K accounts for >75% of the observed MIR total flux density. The blackbody emission arises from a combination of (1) dust emission in the torus; and (2) diffuse dust emission around the nuclear region, but the contributions of the two components cannot be well-constrained in these observations.
URI http://hdl.handle.net/10261/110218
DOI10.1088/0004-637X/793/2/81
Identificadoresdoi: 10.1088/0004-637X/793/2/81
e-issn: 1538-4357
issn: 0004-637X,
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