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http://hdl.handle.net/20.500.12386/27011
Title: | Orientation effects on spectral emission features of quasars | Authors: | Bisogni, Susanna Marconi, Alessandro RISALITI, Guido |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 464 | Issue: | 1 | First Page: | 385 | Abstract: | We present an analysis of the orientation effects in Sloan Digital Sky Survey (SDSS) quasar composite spectra. In a previous work, we have shown that the equivalent width (EW) of the [O III] λ5007 Å (vacuum rest wavelength 5008.24 Å) line is a reliable indicator of the inclination of the accretion disc. Here, we have selected a sample of ∼12 000 quasars from the SDSS 7th Data Release and divided it in subsamples with different values of EW_{[{O {III}]}}. We find inclination effects both on broad and narrow quasars emission lines, among which an increasing broadening from low to high EW for the broad lines and a decreasing importance of the blue component for the narrow lines. These effects are naturally explained with a variation of source inclination from nearly face-on to edge-on, confirming the goodness of EW_{[{O {III}]}} as an orientation indicator. Moreover, we suggest that orientation effects could explain, at least partially, the origin of the anticorrelation between [O III] and Fe II intensities, I.e. the well-known eigenvector 1. | URI: | http://hdl.handle.net/20.500.12386/27011 | URL: | https://academic.oup.com/mnras/article/464/1/385/2194687 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw2324 | Bibcode ADS: | 2017MNRAS.464..385B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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stw2324.pdf | PDF editoriale | 2.68 MB | Adobe PDF | View/Open |
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