Long-Term Optical Monitoring of Broad-Line AGNs (LoTerm AGN): Case Study of NGC 3516-Reference-Cited by-同舟云学术

Long-Term Optical Monitoring of Broad-Line AGNs (LoTerm AGN): Case Study of NGC 3516

Published:2023-12-27 Issue:1 Volume:6 Page:31-45
ISSN:2624-8174
Container-title:Physics
language:en
Short-container-title:Physics

Author:

Ilić Dragana¹^ORCID,Popović Luka Č.¹²^ORCID,Burenkov Alexander³^ORCID,Shablovinskaya Elena³^ORCID,Malygin Eugene³^ORCID,Uklein Roman³^ORCID,Moiseev Alexei V.³^ORCID,Oparin Dmitry³^ORCID,Patiño Álvarez Víctor M.⁴⁵^ORCID,Chavushyan Vahram⁴⁶^ORCID,Marziani Paola⁷^ORCID,D’Onofrio Mauro⁷⁸^ORCID,Floris Alberto⁸,Kovačević Andjelka B.¹^ORCID,Jovičić Jovana¹,Miković Djordje¹,Rakić Nemanja⁹^ORCID,Simić Saša¹⁰^ORCID,Marčeta Mandić Sladjana²^ORCID,Ciroi Stefano⁸^ORCID,Vietri Amelia⁸^ORCID,Crepaldi Luca⁸^ORCID,del Olmo Ascensión¹¹^ORCID

Affiliation:

1. Department of Astronomy, Faculty of Mathematics, University of Belgrade, Studentski trg 16, 11000 Belgrade, Serbia

2. Astronomical Observatory, Volgina 7, 11000 Belgrade, Serbia

3. Special Astrophysical Observatory of the Russian Academy of Sciences, 369167 Nizhnij Arkhyz, Russia

4. Instituto Nacional de Astrofisica, Optica y Electronica, Apartado Postal 51-216, Puebla 72000, Mexico

5. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

6. Center for Astrophysics, Harvard & Smithsonian 60 Garden Street, Cambridge, MA 02138, USA

7. Affiliation INAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy

8. Dipartimento di Fisica e Astronomia, Universitá di Padova, 35122 Padova, Italy

9. Physics Department, Faculty of Natural Sciences and Mathematics, University of Banjaluka, Mladena Stojanovića 2, 78000 Banjaluka, RS, Bosnia and Herzegovina

10. Faculty of Science, University of Kragujevac, Radoja Domanovića 12, 34000 Kragujevac, Serbia

11. Instituto de Astrofisica de Andalucia, IAA-CSIC, Glorieta de la Astronomia s/n, E-18008 Granada, Spain

Abstract

Properties of the broad line region (BLR) in active galactic nuclei (AGNs) are commonly used to estimate the mass of the supermassive black hole (SMBH) that powers an AGN. However, the understanding of the physics behind the BLR remains incomplete. The AGNs exhibit strong optical variability, observed in the change of the profiles and fluxes of broad emission lines. Utilizing this variability provides an opportunity to constrain the physics of the BLR, and understand the interplay of the BLR with SMBH and surrounding regions. Here, we present the long-term monitoring campaign of a sample of the known broad-line AGNs (identified as LoTerm AGN). The aim of this study is to show the importance of sustained and dedicated campaigns that continually collect spectroscopic data of the known AGNs over extended timescales, providing unique insight into the origin and structure of the BLR. LoTerm AGN is a collaborative network of seven moderate-size telescopes equipped for spectroscopy. We focus on the recent spectral data of the known changing-look AGN, NGC 3516. Specifically, we examine the broad hydrogen Balmer Hα line observed in the period 2020–2023, demonstrating that this AGN remains active with the BLR signatures observed in the spectra. No significant change in the broad line profile of Hα line is observed during this recent period.

Publisher

MDPI AG

Subject

General Physics and Astronomy

Link

https://www.mdpi.com/2624-8174/6/1/3/pdf

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