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Título

Resolving the nuclear dust distribution of the Seyfert 2 galaxy NGC 3081

AutorRamos-Almeida, Cristina; Sánchez-Portal, Miguel; Pérez-García, Ana M.; Acosta-Pulido, J. A. ; Castillo, Manuel; Asensio Ramos, A.; González-Serrano, José Ignacio ; Alonso-Herrero, A. ; Rodríguez-Espinosa, J. M.; Hatziminaoglou, E.; Coia, D.; Valtchanov, Iván; Pović, Mirjana; Esquej, Pilar ; Packham, Christopher; Altieri, B.
Palabras claveGalaxies: active
Galaxies: nuclei
Galaxies: Seyfert
Infrared: galaxies
Galaxies: individual: NGC 3081
Fecha de publicaciónoct-2011
EditorWiley-Blackwell
CitaciónMonthly Notices of the Royal Astronomical Society 417(1): L46-L50 (2011)
ResumenWe report far-infrared (FIR) imaging of the Seyfert 2 galaxy NGC 3081 in the range 70–500 μm, obtained with an unprecedented angular resolution, using the Herschel Space Observatory instruments PACS and SPIRE. The 11 kpc (∼70 arcsec) diameter star-forming ring of the galaxy appears resolved up to 250 μm. We extracted IR (1.6–500 μm) nuclear fluxes, that is active nucleus-dominated fluxes, and fitted them with clumpy torus models, which successfully reproduce the FIR emission with small torus sizes. Adding the FIR data to the near- and mid-IR spectral energy distribution (SED) results in a torus radial extent of Ro= 4+2− 1 pc, as well as in a flat radial distribution of the clouds (i.e. the q parameter). At wavelengths beyond 200 μm, cold dust emission at T= 28 ± 1 K from the circumnuclear star-forming ring of 2.3 kpc (∼15 arcsec) in diameter starts making a contribution to the nuclear emission. The dust in the outer parts of the galaxy is heated by the interstellar radiation field (19 ± 3 K).
Versión del editorhttp://dx.doi.org/10.1111/j.1745-3933.2011.01117.x
URIhttp://hdl.handle.net/10261/46521
DOI10.1111/j.1745-3933.2011.01117.x
ISSN0035-8711
E-ISSN1365-2966
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