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

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

Authors :
Ilić, Dragana
Popović, Luka Č.
Burenkov, Alexander
Shablovinskaya, Elena
Malygin, Eugene
Uklein, Roman
Moiseev, Alexei V.
Oparin, Dmitry
Patiño Álvarez, Víctor M.
Chavushyan, Vahram
Marziani, Paola
D’Onofrio, Mauro
Floris, Alberto
Kovačević, Andjelka B.
Jovičić, Jovana
Miković, Djordje
Rakić, Nemanja
Simić, Saša
Marčeta Mandić, Sladjana
Ciroi, Stefano
Vietri, Amelia
Crepaldi, Luca
del Olmo, Ascensión
Ilić, Dragana
Popović, Luka Č.
Burenkov, Alexander
Shablovinskaya, Elena
Malygin, Eugene
Uklein, Roman
Moiseev, Alexei V.
Oparin, Dmitry
Patiño Álvarez, Víctor M.
Chavushyan, Vahram
Marziani, Paola
D’Onofrio, Mauro
Floris, Alberto
Kovačević, Andjelka B.
Jovičić, Jovana
Miković, Djordje
Rakić, Nemanja
Simić, Saša
Marčeta Mandić, Sladjana
Ciroi, Stefano
Vietri, Amelia
Crepaldi, Luca
del Olmo, Ascensión
Publication Year :
2023

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 H<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>α</mi>emantics></math></inline-formula> 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 H<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi>α</mi>emantics></math></inline-formula> line is observed during this recent period.

Details

Database :
OAIster
Publication Type :
Electronic Resource
Accession number :
edsoai.on1431957141
Document Type :
Electronic Resource