Subaru spectroscopy and spectral modeling of Cygnus A
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Archivos
Fecha
2014-06
Profesor/a Guía
Facultad/escuela
Idioma
en
Título de la revista
ISSN de la revista
Título del volumen
Editor
Institute of Physics Publishing
Nombre de Curso
Licencia CC
Atribution 4.0 International (CC BY 4.0)
Licencia CC
https://creativecommons.org/licenses/by/4.0/deed.es
Resumen
We present high angular resolution (∼0.
5) MIR spectra of the powerful radio galaxy, Cygnus A (Cyg A), obtained
with the Subaru telescope. The overall shape of the spectra agree with previous high angular resolution MIR
observations, as well as previous Spitzer spectra. Our spectra, both on and off nucleus, show a deep silicate
absorption feature. The absorption feature can be modeled with a blackbody obscured by cold dust or a clumpy
torus. The deep silicate feature is best fit by a simple model of a screened blackbody, suggesting that foreground
absorption plays a significant, if not dominant, role in shaping the spectrum of Cyg A. This foreground absorption
prevents a clear view of the central engine and surrounding torus, making it difficult to quantify the extent the torus
attributes to the obscuration of the central engine, but does not eliminate the need for a torus in Cyg A.
Notas
Indexación: Scopus.
Palabras clave
Galaxies: Active, Galaxies: Individual (Cygnus A), Infrared: Galaxies Online-only material: color figures
Citación
Astrophysical Journal. Volume 788, Issue 1. 10 June 2014. Article number 6
DOI
DOI: 10.1088/0004-637X/788/1/6