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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: 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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