Resolving the nuclear dust distribution of the Seyfert 2 galaxy NGC 3081
| Autor: | Bruno Altieri, M. Sánchez-Portal, Mirjana Pović, J. M. Rodríguez Espinosa, A. M. Pérez-García, Maite Castillo, P. Esquej, A. Asensio Ramos, Chris Packham, A. Alonso-Herrero, Evanthia Hatziminaoglou, D. Coia, J. A. Acosta-Pulido, José Ignacio González-Serrano, I. Valtchanov, C. Ramos Almeida |
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| Rok vydání: | 2011 |
| Předmět: |
Physics
Range (particle radiation) Infrared Astrophysics::High Energy Astrophysical Phenomena Astronomy and Astrophysics Torus Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Galaxy Spire Wavelength Space and Planetary Science Spectral energy distribution Angular resolution Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society: Letters. 417:L46-L50 |
| ISSN: | 1745-3925 |
| Popis: | We report far-infrared (FIR) imaging of the Seyfert 2 galaxy NGC 3081 in the range 70-500 micron, 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 micron. We extracted infrared (1.6-500 micron) 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-infrared 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 micron, 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). |
| Databáze: | OpenAIRE |
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