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dc.contributor.authorIchikawa, Kohei
dc.contributor.authorPackham., Christopher C
dc.contributor.authorAlmeida, Cristina Ramos
dc.contributor.authorRamos, Andrés Asensio
dc.contributor.authorAlonso-Herrero, Almudena
dc.contributor.authorGonzález-Martín, Omaira
dc.contributor.authorLópez Rodríguez, Enrique
dc.contributor.authorUeda, Yoshihiro
dc.contributor.authorDíaz-Santos, Tanio
dc.contributor.authorPerlman, Eric S.
dc.date.accessioned2017-02-01T16:04:50Z
dc.date.available2017-02-01T16:04:50Z
dc.date.issued2015-04-20
dc.identifier.citationIchikawa, K., Packham, C., Almeida, C. R., Ramos, A. A., Alonso-Herrero, A., González-Martín, O., . . . Alsip, C. D. (2015). The differences in the torus geometry between hidden and non-hidden broad line active galactic nuclei. Astrophysical Journal, 803(2) doi:10.1088/0004-637X/803/2/57en_US
dc.identifier.urihttp://hdl.handle.net/11141/1160
dc.description.abstractWe present results from the fitting of infrared (IR) spectral energy distributions of 21 active galactic nuclei (AGNs) with clumpy torus models. We compiled high spatial resolution (∼0.3–0.7 arcsec) mid-IR (MIR) N-band spectroscopy, Q-band imaging, and nuclear near- and MIR photometry from the literature. Combining these nuclear near- and MIR observations, far-IR photometry, and clumpy torus models enables us to put constraints on the torus properties and geometry. We divide the sample into three types according to the broad line region (BLR) properties: type-1s, type-2s with scattered or hidden broad line region (HBLR) previously observed, and type-2s without any published HBLR signature (NHBLR). Comparing the torus model parameters gives us the first quantitative torus geometrical view for each subgroup. We find that NHBLR AGNs have smaller torus opening angles and larger covering factors than HBLR AGNs. This suggests that the chance to observe scattered (polarized) flux from the BLR in NHBLR could be reduced by the dual effects of (a) less scattering medium due to the reduced scattering volume given the small torus opening angle and (b) the increased torus obscuration between the observer and the scattering region. These effects give a reasonable explanation for the lack of observed HBLR in some type-2 AGNs.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is made available in accordance with the publisher's policy. It may be subject to U.S. copyright law.en_US
dc.rights.urihttps://aas.org/publications/aas-copyright-policyen_US
dc.titleThe differences in the torus geometry between hidden and non-hidden broad line active galactic nucleien_US
dc.typeArticleen_US
dc.identifier.doi10.1088/0004-637X/803/2/57


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