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dc.contributor.authorStorchi-Bergmann, Thaisapt_BR
dc.contributor.authorMulchaey, John Scottpt_BR
dc.contributor.authorWilson, Andrew S.pt_BR
dc.date.accessioned2014-12-31T02:10:51Zpt_BR
dc.date.issued1992pt_BR
dc.identifier.issn0004-637Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/108725pt_BR
dc.description.abstractThe nature of the infrared continuum in Seyfert 2 galaxies is not well understood. An attractive model is one in which dust grains near the nucleus are heated by optical and ultraviolet photons from a central source and reradiate in the IR. However, a comparison of the observed optical-UV continuum with the observed IR emission indicates that in many Seyfert 2's there is a deficiency of dust heating photons. This apparent defi­ ciency may be understood if the photons responsible for heating the dust escape anisotropically. Recent work has revealed that a number of Seyfert 2 galaxies exhibit conically shaped regions of gas apparently illuminated by a collimated, nuclear ionizing source. In this Letter, we test one model for this collimation, namely that the cones result from shadowing of a compact nuclear continuum source by a thick, dusty torus. From the emission-line ratios measured for gas within the cones, we have calculated the number of ionizing photons emitted by the compact nucleus. Then, on the assumption that this compact nuclear source radiates iso­ tropically, we have found the optical-UV power incident on the torus, which is expected to be reradiated in the IR. We find the observed IRAS luminosities are consistent with the torus model in eight of the nine objects with sufficient data to perform the calculation.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofThe astrophysical journal. Chicago. Vol. 395, no. 2, pt. 2 (Aug. 1992), p. L73-L77pt_BR
dc.rightsOpen Accessen
dc.subjectGalaxies: activeen
dc.subjectPoeira cosmicapt_BR
dc.subjectGalaxies: nucleien
dc.subjectNucleo galaticopt_BR
dc.subjectGalaxies: seyferten
dc.subjectMateria interestelarpt_BR
dc.subjectGalaxias seyfertpt_BR
dc.subjectInfrared: galaxiesen
dc.titleInfrared emission in Seyfert 2 galaxies : reprocessed radiation from a dusty torus?pt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000055859pt_BR
dc.type.originEstrangeiropt_BR


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