Publications (13)
Gravitational Redshift of Emission Lines in the AGN Spectra
Nataša Bon, Edi Bon, Paola Marziani +1
The detection of gravitationally redshifted optical emission lines has been reported just for a few active galaxies. In this paper we give a short overview of studies that analyzed…
Changing-look active galactic nuclei: close binaries of supermassive black holes in action
Jian-Min Wang, Edi Bon
Changing-look active galactic nuclei (CL-AGNs) as a new subpopulation challenge some fundamental physics of AGNs because the timescales of the phenomenon can hardly be reconciled w…
Saturation of the curve -- diagnostics of the continuum and H emission in Population B active galaxy NGC 5548
Swayamtrupta Panda, Edi Bon, Paola Marziani +1
NGC 5548 has been hailed as an archetypical type-1 active galactic nuclei (AGN) and serves as a valuable laboratory to study the long-term variation of its broad-line region (BLR).…
A Possible ~20 yr Periodicity in Long-term Optical Photometric and Spectral Variations of the Nearby Radio-Quiet Active Galactic Nucleus Ark 120
Yan-Rong Li, Jian-Min Wang, Zhi-Xiang Zhang +15
We study the long-term variability in the optical monitoring database of Ark~120, a nearby radio-quiet active galactic nucleus (AGN) at a distance of 143 Mpc (z=0.03271). We compil…
Line Shapes Emitted from Spiral Structures around Symmetric Orbits of Supermassive Binary Black Holes
Marijana SmailagiÄ, Edi Bon
Variability of active galactic nuclei is not well understood. One possible explanation is existence of supermassive binary black holes (SMBBH) in their centres. It is expected that…
Feeding frenzy in the mighty black holes: what we could learn from them?
Swayamtrupta Panda, Hygor Benati Gonçalves, Thaisa Storchi-Bergmann +14
Eddington ratio is a paramount parameter governing the accretion history and life cycles of Active Galactic Nuclei (AGNs). This short review presents a multi-faceted view of the im…
From sub-solar to super-solar chemical abundances along the quasar main sequence
Paola Marziani, Alberto Floris, Alice Deconto-Machado +8
The 4D Eigenvector 1 sequence has proven to be a highly effective tool for organizing observational and physical properties of type 1 active galactic nuclei (AGN). In this paper, w…
Taming the derivative: diagnostics of the continuum and H emission in a prototypical Population B active galaxy
Swayamtrupta Panda, Edi Bon, Paola Marziani +1
We report preliminary results on the analysis of the continuum and H light curves of the type-1 active galactic nucleus (AGN) NGC 5548. We notice a clear signature of shallowin…
Black holes, gravitational waves and fundamental physics: a roadmap
Leor Barack, Vitor Cardoso, Samaya Nissanke +203
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum energy, inflation and early universe cosmology, singularities and the hierarchy problem-…
Broad-line region in NGC 4151 monitored by two decades of reverberation mapping campaigns. I. Evolution of structure and kinematics
Yong-Jie Chen, Dong-Wei Bao, Shuo Zhai +33
We report the results of long-term reverberation mapping (RM) campaigns of the nearby active galactic nuclei (AGN) NGC 4151, spanning from 1994 to 2022, based on archived observati…
Optical singly-ionized iron emission in radio-quiet and relativistically jetted active galactic nuclei
Paola Marziani, Marco Berton, Swayamtrupta Panda +1
The issue of the difference between optical and UV properties of radio-quiet and radio-loud (relativistically "jetted") active galactic nuclei (AGN) is a long standing one, related…
AGN Broad Line Region variability in the context of Eigenvector 1: case of NGC 5548
Nataša Bon, Edi Bon, Paola Marziani
Many active galactic nuclei (AGN) show strong variability of the optical continuum. Since the line flux, profile shapes and intensity ratios are changing, we analyze the variabilit…
Where to search for supermassive binary black holes
Paola Marziani, Edi Bon, Natasa Bon +1
Supermassive binary black holes (SMBBHs) are the anticipated byproducts of galaxy mergers and play a pivotal role in shaping galaxy evolution, gravitational wave emissions, and acc…