Bibcode
Mori, T. I.; Imanishi, Masatoshi; Alonso-Herrero, Almudena; Packham, Chris; Ramos Almeida, C.; Nikutta, Robert; González-Martín, O.; Perlman, Eric; Saito, Yuriko; Levenson, Nancy A.
Referencia bibliográfica
Publications of the Astronomical Society of Japan, Volume 66, Issue 5, id.9310 pp.
Fecha de publicación:
10
2014
Número de citas
11
Número de citas referidas
11
Descripción
We report near-infrared K ', L', and M ' band imaging observations of
the nearby merging galaxy NGC 6240 with the Infrared Camera and
Spectrograph on the Subaru telescope. The observations were performed
with the assistance of the Subaru Adaptive Optics System, and the
achieved spatial resolutions were around
0{^''.}10-0{^''.}20. We also obtained new
mid-infrared imaging in the Si-2 filter band (8.7 μm) and N-band
(7.5-13 μm) spectroscopy of this galaxy with the CanariCam on the
Gran Telescopio Canarias with a spatial resolution of
0{^''.}4-0{^''.}5. In the K ' band image the two
nuclei of the galaxy each show a double peak suggesting the complex
geometry of the source, while the L', M ', and Si-2 band images show
single compact structures in each of the two nuclei. Assuming that the
center core observed at wavelengths longer than 3.8 μm is associated
with dust heated by the buried AGN, we re-evaluated the spectral energy
distributions (SEDs) of the southern nucleus from 2 to 30 μm with
additional literature values, and performed the SED+spectroscopy fit
using the clumpy torus models of Nenkova et al. (2008a, ApJ, 685, 145;
2008b, ApJ, 685, 160) and a Bayesian fitting approach. The model fit
suggests that the high covering factor torus emission in the southern
nucleus is also obscured by foreground dust in the host galaxy. The
estimated AGN bolometric luminosity of the southern nucleus,
Lbol(AGN) ˜ 1 × 1045 erg
s-1, accounts for approximately 40% of the whole luminosity
of the system.
Proyectos relacionados
Actividad Nuclear en Galaxias: una Perspectiva 3D del Núcleo y su Entorno
Nuestro proyecto puede dividirse en dos líneas principales de investigación. En primer lugar, el estudio de los vientos producidos por cuásares luminosos oscurecidos y del impacto que estos tienen en sus galaxias anfitrionas (retroalimentación del AGN). Para ello hemos obtenido observaciones infrarrojas y ópticas con los instrumentos del Gran
Cristina
Ramos Almeida