| Issue |
A&A
Volume 663, July 2022
|
|
|---|---|---|
| Article Number | A77 | |
| Number of page(s) | 11 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361/202142806 | |
| Published online | 14 July 2022 | |
Radiation pressure on dust explaining the low ionized broad emission lines in active galactic nuclei
Dust as an important driver of line shape
1
Center for Theoretical Physics, Polish Academy of Sciences, Lotników 32/46, 02-668 Warsaw, Poland
e-mail: naddaf@cft.edu.pl
2
Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warsaw, Poland
Received:
1
December
2021
Accepted:
11
April
2022
Context. Broad emission lines are the most characteristic features in the spectra of galaxies with an active galactic nucleus (AGN). They mostly show either single-peaked or double-peaked profiles and originate from a complex dynamics of the likely discrete clouds moving in a spatially extended region known as the broad line region (BLR).
Aims. In this paper, we present a large grid of results, which is used to test the model based on calculations of the spectral line generic profiles.
Methods. We followed a non-hydrodynamical single-cloud approach to BLR dynamics based on a radiatively dust-driven model. We previously showed in detail that the 2.5D version of the model could provide us with the 3D geometry of the BLR.
Results. We show that the shape of profiles not only depends on the accretion rate of the source, the black hole mass, and the viewing angle, but it is most significantly affected by the adopted dust-to-gas mass ratio regulating the strength of the radiation pressure. We also show that the model can aptly explain the low ionized broad emission lines of the mean spectrum of quasars, such as MgII and Hβ.
Conclusions. The radiatively dust-driving mechanism can appropriately account for the low-ionized part of BLR of AGNs.
Key words: accretion, accretion disks / radiation: dynamics / line: profiles / radiative transfer / galaxies: active / quasars: emission lines
© M. H. Naddaf and B. Czerny 2022
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe-to-Open model. Subscribe to A&A to support open access publication.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.