The dusty nuclear torus in NGC 4151 : constraints from gemini near-infrared integral field spectrograph observations
dc.contributor.author | Riffel, Rogemar André | pt_BR |
dc.contributor.author | Storchi-Bergmann, Thaisa | pt_BR |
dc.contributor.author | McGregor, Peter J. | pt_BR |
dc.date.accessioned | 2015-01-15T02:15:13Z | pt_BR |
dc.date.issued | 2009 | pt_BR |
dc.identifier.issn | 0004-637X | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/108980 | pt_BR |
dc.description.abstract | We have used a near-infrared (near-IR) nuclear spectrum (covering the Z, J, H, and K bands) of the nucleus of NGC 4151 obtained with the Gemini Near-Infrared Integral Field Spectrograph (NIFS) and adaptive optics, to isolate and constrain the properties of a near-IR unresolved nuclear source whose spectral signature is clearly present in our data. The near-IR spectrumwas combined with an optical spectrum obtained with the Space Telescope Imaging Spectrograph which was used to constrain the contribution of a power-law component. After subtraction of the power-law component, the near-IR continuum is well fitted by a blackbody function, with T = 1285 ± 50 K, which dominates the nuclear spectrum—within an aperture of radius 0".3—in the near-IR. We attribute the blackbody component to emission by a dusty structure, with hot dust mass MHD = (6.9 ± 1.5) × 10−4 Mʘ , not resolved by our observations, which provide only an upper limit for its distance from the nucleus of 4 pc. If the reddening derived for the narrow-line region also applies to the near-IR source, we obtain a temperature T = 1360±50 K and a mass MHD = (3.1±0.7)×10−4 Mʘ for the hot dust. This structure may be the inner wall of the dusty torus postulated by the unified model or the inner part of a dusty wind originating in the accretion disk. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | The astrophysical journal. Bristol. Vol. 698, no. 2 (June 2009), p. 1767-1770 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Galaxies: active | en |
dc.subject | Galaxias seyfert | pt_BR |
dc.subject | Galaxies: individual (NGC 4151) | en |
dc.subject | Materia interestelar | pt_BR |
dc.subject | Galaxies: ISM | en |
dc.subject | Nucleo galatico | pt_BR |
dc.subject | Poeira cosmica | pt_BR |
dc.subject | Galaxies: nuclei | en |
dc.title | The dusty nuclear torus in NGC 4151 : constraints from gemini near-infrared integral field spectrograph observations | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000766241 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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