| Issue |
A&A
Volume 685, May 2024
|
|
|---|---|---|
| Article Number | A116 | |
| Number of page(s) | 15 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/202348800 | |
| Published online | 15 May 2024 | |
Quasar 3C 47: Extreme Population B jetted source with double-peaked profiles⋆
1
Space Science and Geospatial Institute (SSGI), Entoto Observatory and Research Centre (EORC), Astronomy and Astrophysics Department, PO Box 33679 Addis Ababa, Ethiopia
e-mail: shimeles11@gmail.com
2
Addis Ababa University (AAU), PO Box 1176 Addis Ababa, Ethiopia
3
Jimma University, College of Natural Sciences, Department of Physics, PO Box 378 Jimma, Ethiopia
4
Istituto Nazionale di Astrofisica (INAF), Osservatorio Astronomico di Padova, vicolo dell’ Osservatorio 5, Padova 35122, Italy
5
Instituto de Astrofisica de Andalucía (IAA-CSIC), Glorieta de la Astronomia s/n, Granada 18008, Spain
6
Mbarara University of Science and Technology (MUST), Faculty of Science, Physics Department, PO Box 1410 Mbarara, Uganda
Received:
30
November
2023
Accepted:
20
February
2024
Context. An optically thick, geometrically thin accretion disk (AD) around a supermassive black hole might contribute to broad-line emission in type 1 active galactic nuclei (AGN). However, the emission line profiles are most often not immediately consistent with the profiles expected from a rotating disk. The extent to which an AD in AGN contributes to the broad Balmer lines and high-ionization UV lines in radio-loud (RL) AGN needs to be investigated.
Aims. This work aims to determine whether the AD can account for the double-peaked profiles observed in the Balmer lines (Hβ, Hα), near-UV (MgIIλ2800), and high-ionization UV lines (C IVλ1549, CIII]λ1909) of the extremely jetted quasar 3C 47.
Methods. The low ionization lines (LILs) (Hβ, Hα, and Mg IIλ2800) were analyzed using a relativistic Keplerian AD model. Fits were carried out following Bayesian and multicomponent nonlinear approaches. The profiles of prototypical high ionization lines (HILs) were also modeled by the contribution of the AD, along with fairly symmetric additional components.
Results. The LIL profiles of 3C 47 agree very well with a relativistic Keplerian AD model. The disk emission is constrained between ≈102 and ≈103 gravitational radii, with a viewing angle of ≈ 30 degrees.
Conclusions. The study provides convincing direct observational evidence for the presence of an AD and explains that the HIL profiles are due to disk and failed-wind contributions. The agreement between the observed profiles of the LILs and the model is remarkable. The main alternative, a double broad-line region associated with a binary black hole, is found to be less favored than the disk model for the quasar 3C 47.
Key words: quasars: emission lines / quasars: general / quasars: supermassive black holes / quasars: individual: 3C 47
© The Authors 2024
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.