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Feii emission in NLS1s – originating from denser regions with higher abundances?

Published online by Cambridge University Press:  29 January 2021

Swayamtrupta Panda ,
Paola Marziani  and
Bożena Czerny
Swayamtrupta Panda
Affiliation:
Center For Theoretical Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland email: panda@cft.edu.pl Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland
Paola Marziani
Affiliation:
INAF-Astronomical Observatory of Padova, Vicolo dell’Osservatorio, 5, 35122 Padova PD, Italy
Bożena Czerny
Affiliation:
Center For Theoretical Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland email: panda@cft.edu.pl
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Abstract

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The interpretation of the main sequence of quasars has become a frontier subject in the last years. This considers the effect of a highly flattened, axially symmetric geometry for the broad line region (BLR) on the parameters related to the distribution of quasars along their main sequence. We utilize the photoionization code CLOUDY to model the BLR, assuming ‘un-constant’ virial factor with a strong dependence on the viewing angle. We show the preliminary results of the analysis to highlight the co-dependence of the Eigenvector 1 parameter, RFeii on the broad Hβ FWHM (i.e. the line dispersion) and the inclination angle (θ), assuming fixed values for the Eddington ratio (Lbo1/LEdd), black hole mass (MBH) and spectral energy distribution (SED) shape. We consider four cases with changing cloud density (nH) and composition. Understanding the emitting region is crucial as this knowledge can be extended to the use of quasars as distance indicators for Cosmology.‡

Keywords

accretionaccretion disksradiation mechanisms: thermalradiative transfergalaxies: active(galaxies:) quasars: emission linesgalaxies: Seyfert
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 77 - 81
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

Footnotes

‡

The project was partially supported by NCN grant no. 2017/26/A/ST9/00756 (MAESTRO9) and MNiSW grant DIR/WK/2018/12. PM acknowledges the INAF PRIN-SKA 2017 program 1.05.01.88.04.

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