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  Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS

Wolf, J., Salvato, M., Coffey, D., Merloni, A., Buchner, J., Arcodia, R., et al. (2020). Exploring the diversity of Type 1 active galactic nuclei identified in SDSS-IV/SPIDERS. Monthly Notices of the Royal Astronomical Society, 492(3), 3580-3601. doi:10.1093/mnras/staa041.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-502D-E Version Permalink: http://hdl.handle.net/21.11116/0000-0006-502E-D
Genre: Journal Article

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 Creators:
Wolf, Julien1, Author              
Salvato, Mara1, Author              
Coffey, Damian1, Author              
Merloni, Andrea1, Author              
Buchner, Johannes1, Author              
Arcodia, Riccardo1, Author              
Baron, Dalya, Author
Carrera, Francisco J., Author
Comparat, Johan1, Author              
Schneider, Donald P., Author
Nandra, Kirpal1, Author              
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We present a statistical analysis of the optical properties of an X-ray-selected Type 1 active galactic nucleus (AGN) sample, using high signal-to-noise ratio (S/N>20) spectra of the counterparts of the ROSAT/2RXS sources in the footprint of the SDSS-IV/SPIDERS (Spectroscopic IDentification of eROSITA Sources) programme. The final sample contains 2100 sources. It significantly extends the redshift and luminosity ranges (z ∼ 0.01–0.80 and L0.1−2.4keV∼2.0×1041−1.0×1046ergs−1⁠) used so far in this kind of analysis. By means of a principal component analysis, we derive eigenvector (EV) 1 and 2 in an eleven-dimensional optical and X-ray parameter space, which are consistent with previous results. The validity of the correlations of the Eddington ratio L/LEdd with EV1 and the black hole mass with EV2 is strongly confirmed. These results imply that L/LEdd and black hole mass are related to the diversity of the optical properties of Type 1 AGNs. Investigating the relation of the width and asymmetry of H β and the relative strength of the iron emission rFeII⁠, we show that our analysis supports the presence of a distinct kinematic region: the very broad line region. Furthermore, comparing sources with a red-asymmetric broad H β emission line to sources for which it is blue asymmetric, we find an intriguing difference in the correlation of the FeII and the continuum emission strengths. We show that this contrasting behaviour is consistent with a flattened, stratified model of the broad-line region, in which the FeII-emitting region is shielded from the central source.

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 Dates: 2020-01-08
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa041
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Title: Monthly Notices of the Royal Astronomical Society
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Source Genre: Journal
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Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 492 (3) Sequence Number: - Start / End Page: 3580 - 3601 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470