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dc.contributor.authorHe, Zhichengpt_BR
dc.contributor.authorSun, Ai-Leipt_BR
dc.contributor.authorZakamska, Nadia L.pt_BR
dc.contributor.authorWylezalek, Dominikapt_BR
dc.contributor.authorKelly, Michaelpt_BR
dc.contributor.authorGreene, Jenny E.pt_BR
dc.contributor.authorRembold, Sandro Barbozapt_BR
dc.contributor.authorRiffel, Rogériopt_BR
dc.contributor.authorRiffel, Rogemar Andrépt_BR
dc.date.accessioned2018-11-22T02:49:14Zpt_BR
dc.date.issued2018pt_BR
dc.identifier.issn0035-8711pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/184938pt_BR
dc.description.abstractExtended narrow-line regions (NLRs) around active galactic nuclei (AGN) are shaped by the distribution of gas in the host galaxy and by the geometry of the circumnuclear obscuration, and thus they can be used to test the AGN unification model. In this work, we quantify the morphologies of the NLRs in 308 nearby AGN (z = 0 − 0.14, Lbol∼1042.4 − 44.1 erg s−1) from the MaNGA survey. Based on the NLR maps, we find that a large fraction (81 per cent) of these AGN have bi-conical NLR morphology. The distribution of their measured opening angles suggests that the intrinsic opening angles of the ionization cones have a mean value of 85◦–98◦ with a finite spread of 39◦–44◦ (1σ). Our inferred opening angle distribution implies a number ratio of type I to type II AGN of 1:1.6–2.3, consistent with other measurements of the type I/type II ratio at low AGN luminosities. Combining these measurements with the WISE photometry data, we find that redder mid-IR colour (lower effective temperature of dust) corresponds to stronger and narrower photoionized bicones. This relation is in agreement with the unification model that suggests that the bi-conical NLRs are shaped by a toroidal dusty structure within a few pc from the AGN. Furthermore, we find a significant alignment between theminor axis of host galaxy discs andAGNionization cones. Together, these findings suggest that obscuration on both circumnuclear (∼pc) and galactic (∼ kpc) scales is important in shaping and orienting the AGN NLRs.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofMonthly notices of the royal astronomical society. Oxford. Vol. 478, no. 3 (Aug. 2018), p. 3614-3626pt_BR
dc.rightsOpen Accessen
dc.subjectGaláxias ativaspt_BR
dc.subjectGalaxies activeen
dc.subjectNucleo galaticopt_BR
dc.subjectGalaxies generalen
dc.subjectGalaxies Seyferten
dc.subjectMapeamentos astronômicospt_BR
dc.subjectGalaxies structureen
dc.titleMorphology of AGN emission-line regions in SDSS-IV MaNGA surveypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001080926pt_BR
dc.type.originEstrangeiropt_BR


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