Polycyclic aromatic hydrocarbon in the central region of the Seyfert 2 galaxy NGC 1808
dc.contributor.author | Sales, Dinalva Aires de | pt_BR |
dc.contributor.author | Pastoriza, Miriani Griselda | pt_BR |
dc.contributor.author | Riffel, Rogério | pt_BR |
dc.contributor.author | Winge, Claudia | pt_BR |
dc.date.accessioned | 2014-04-15T01:50:50Z | pt_BR |
dc.date.issued | 2013 | pt_BR |
dc.identifier.issn | 0035-8711 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/94339 | pt_BR |
dc.description.abstract | We present mid-infrared spectra of the Seyfert 2 galaxy NGC 1808, obtained with the Gemini’s Thermal-Region Camera Spectrograph at a spatial resolution of ∼26 pc. The high spatial resolution allowed us to detect bright polycyclic aromatic hydrocarbons (PAHs) emissions at 8.6 and 11.3 μm in the galaxy centre (∼26 pc) up to a radius of 70 pc from the nucleus. The spectra also present [Ne II]12.8 μm ionic lines, and H2 S(2) 12.27 μm molecular gas line. We found that the PAHs profiles are similar to Peeters’s A class, with the line peak shifted towards the blue. The differences in the PAH line profiles also suggest that the molecules in the region located 26 pc north-east of the nucleus are more in the neutral than in the ionized state, while at 26 pc south-west of the nucleus, the molecules are mainly in ionized state. After removal of the underlying galaxy contribution, the nuclear spectrum can be represented by a Nenkova’s CLUMPY torus model, indicating that the nucleus of NGC 1808 hosts a dusty toroidal structure with an angular cloud distribution of σ = 70◦, observer’s view angle i = 90◦ and an outer radius of R0 ∼ 0.55 pc. The derived column density along the line of sight is NH = 1.5 × 1024 cm2, which is sufficient to block the hard radiation from the active nucleus, and would explain the presence of PAH molecules near to the NGC 1808’s active nucleus. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Monthly notices of the royal astronomical society. Oxford. Vol. 429, no. 3 (Mar. 2013), p. 2634-2642 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Nucleo galatico | pt_BR |
dc.subject | Techniques: spectroscopic | en |
dc.subject | Compostos orgânicos | pt_BR |
dc.subject | ISM: molecules | en |
dc.subject | Galaxies: seyfert | en |
dc.subject | Espectros astronômicos | pt_BR |
dc.subject | Galaxias seyfert | pt_BR |
dc.subject | Galaxies: starburst | en |
dc.subject | Infrared: ISM | en |
dc.title | Polycyclic aromatic hydrocarbon in the central region of the Seyfert 2 galaxy NGC 1808 | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000902791 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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