Modeling the Infrared Reverberation Response of the Circumnuclear Dusty Torus in AGNs: The Effects of Cloud Orientation and Anisotropic Illumination

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dc.contributor.authorAlmeyda, Triana
dc.contributor.authorRobinson, Andrew
dc.contributor.authorRichmond, Michael
dc.contributor.authorVazquez, Billy
dc.contributor.authorNikutta, Robert
dc.date.accessioned2024-01-10T13:15:00Z
dc.date.available2024-01-10T13:15:00Z
dc.date.issued2017
dc.description.abstractThe obscuring circumnuclear torus of dusty molecular gas is one of the major components of active galactic nuclei (AGN). The torus can be studied by analyzing the time response of its infrared (IR) dust emission to variations in the AGN continuum luminosity, a technique known as reverberation mapping. The IR response is the convolution of the AGN ultraviolet/optical light curve with a transfer function that contains information about the size, geometry, and structure of the torus. Here, we describe a new computer model that simulates the reverberation response of a clumpy torus. Given an input optical light curve, the code computes the emission of a 3D ensemble of dust clouds as a function of time at selected IR wavelengths, taking into account light travel delays. We present simulated dust emission responses at 3.6, 4.5, and 30 mu m that explore the effects of various geometrical and structural properties, dust cloud orientation, and anisotropy of the illuminating radiation field. We also briefly explore the effects of cloud shadowing (clouds are shielded from the AGN continuum source). Example synthetic light curves have also been generated, using the observed optical light curve of the Seyfert 1 galaxy NGC 6418 as input. The torus response is strongly wavelength-dependent, due to the gradient in cloud surface temperature within the torus, and because the cloud emission is strongly anisotropic at shorter wavelengths. Anisotropic illumination of the torus also significantly modifies the torus response, reducing the lag between the IR and optical variations.
dc.description.funderNASA
dc.description.funderFONDECYT
dc.fechaingreso.objetodigital2024-05-30
dc.format.extent16 páginas
dc.fuente.origenWOS
dc.identifier.doi10.3847/1538-4357/aa7687
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.3847/1538-4357/aa7687
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78462
dc.identifier.wosidWOS:000404347000003
dc.information.autorucFísica;Nikutta R;S/I;250319
dc.issue.numero1
dc.language.isoen
dc.nota.accesoContenido parcial
dc.publisherIOP PUBLISHING LTD
dc.revistaASTROPHYSICAL JOURNAL
dc.rightsacceso restringido
dc.subjectdust, extinction
dc.subjectgalaxies: active
dc.subjectgalaxies: nuclei
dc.subjectgalaxies: Seyfert
dc.subjectinfrared: galaxies
dc.subjectradiative transfer
dc.subjectACTIVE GALACTIC NUCLEI
dc.subjectSUPERMASSIVE BLACK-HOLES
dc.subjectIONIZING CONTINUUM VARIATIONS
dc.subjectEMISSION-LINE REGION
dc.subjectSEYFERT-GALAXIES
dc.subjectNGC 1068
dc.subjectCLUMPY TORI
dc.subjectHOT DUST
dc.subjectSILICATE FEATURES
dc.subjectCIRCINUS GALAXY
dc.titleModeling the Infrared Reverberation Response of the Circumnuclear Dusty Torus in AGNs: The Effects of Cloud Orientation and Anisotropic Illumination
dc.typeartículo
dc.volumen843
sipa.codpersvinculados250319
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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