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http://hdl.handle.net/20.500.12386/29745
Titolo: | Orientation effects on the near-infrared broad-band emission of quasars | Autori: | Bisogni, Susanna LUSSO, ELISABETA Marconi, Alessandro RISALITI, Guido |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 485 | Fascicolo: | 1 | Da pagina:: | 1405 | Abstract: | We recently proposed the equivalent width (EW) of the narrow [O III]5007 Å emission line as an orientation indicator for active galactic nuclei. We tested this method on about 12 300 optically selected broad-line quasars from the SDSS seventh Data Release at redshift z < 0.8 and with full width at half-maximum values of broad emission lines (H α, H β, and Mg II) larger than 2000 km s<SUP>-1</SUP>. We now examine their spectral energy distributions (SEDs) using broad-band photometry from the near-infrared to the ultraviolet to look for variations in the overall shape as a function of the EW[O III]. We find that quasars with low EW[O III] values (close to face-on position) have flatter near-infrared SEDs with respect to sources with high EW[O III] values (almost edge-on). Moreover, quasars with high EW[O III] values show a factor of ∼2 lower emission in the UV to quasars with low EW[O III] values. Our findings indicate that the torus is clumpy and, on average, co-axial with the accretion disc and broad-line region, in agreement with the most recent theoretical models for the obscuring torus. | URI: | http://hdl.handle.net/20.500.12386/29745 | URL: | https://academic.oup.com/mnras/article/485/1/1405/5322189 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz495 | Bibcode ADS: | 2019MNRAS.485.1405B | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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