196 citations · 751 across the 34 of their papers we have counts for
20 papers · 1 filter
VAR-PZnn: A machine-learning framework for AGN photometric redshifts using color and variability-based features
S. Satheesh-Sheeba, P. Sánchez-Sáez, R. J. Assef +39
Photometric redshift estimation for active galactic nuclei (AGNs) remains a fundamental challenge for current and upcoming large-scale photometric surveys. Traditional spectral ene…
Scalable and Robust Multiband Modeling of AGN Light Curves in Rubin-LSST
Weixiang Yu, John J. Ruan, Colin J. Burke +22
The Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST) will monitor tens of millions of active galactic nuclei (AGNs) for a period of 10 years with an average caden…
Clues of the restarting active galactic nucleus activity of Mrk 1498 from GTC/MEGARA integral field spectroscopy data
S. Cazzoli, L. Hernández-García, I. Márquez +4
Some giant radio galaxies selected at X-rays with an AGN show signs of a restarted nuclear activity. One object in this peculiar class is Mrk1498, a giant low-frequency double radi…
Exploring Changing-look Active Galactic Nuclei with the Sloan Digital Sky Survey V: First Year Results
Grisha Zeltyn, Benny Trakhtenbrot, Michael Eracleous +32
"Changing-look" active galactic nuclei (CL-AGNs) challenge our basic ideas about the physics of accretion flows and circumnuclear gas around supermassive black holes. Using first-y…
A Transient "Changing-look'' Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data
Grisha Zeltyn, Benny Trakhtenbrot, Michael Eracleous +32
We report the discovery of a new ``changing-look'' active galactic nucleus (CLAGN) event, in the quasar SDSS J162829.17+432948.5 at z=0.2603, identified through repeat spectroscopy…
Daily variability at milli-arcsecond scales in the radio quiet NLSy1 Mrk 110
Francesca Panessa, Miguel Perez-Torres, Lorena Hernandez-Garcia +14
The origin of radio emission in the majority of Active Galactic Nuclei (AGN) is still poorly understood. Various competing mechanisms are likely involved in the production of radio…
Hard X-ray selected giant radio galaxies -- II. Morphological evidence of restarted radio activity
G. Bruni, F. Panessa, L. Bassani +10
About 6% of Radio Galaxies (RG) can reach linear sizes larger than 0.7 Mpc, and are then classified as Giant Radio Galaxies (GRG). The conditions that make possible the formation o…
Optical Spectroscopy of nearby type1-LINERs
S. Cazzoli, I. Márquez, J. Masegosa +6
We present the highlights from our recent study of 22 local (z0.025) type-1 LINERs from the Palomar Survey, on the basis of optical long-slit spectroscopic observations taken wi…
A young and obscured AGN embedded in the giant radio galaxy Mrk 1498
L. Hernández-García, F. Panessa, L. Bassani +10
Mrk 1498 is part of a sample of galaxies with extended emission line regions (extended outwards up to a distance of 7 kpc) suggested to be photo-ionized by an AGN that has fa…
A discovery of young radio sources in the cores of giant radio galaxies selected at hard X-rays
G. Bruni, F. Panessa, L. Bassani +9
Giant Radio Galaxies (GRG) are the largest single entities in the Universe, having a projected linear size exceeding 0.7 Mpc, which implies that they are also quite old objects. Th…
Probing restarting activity in hard X-ray selected giant radio galaxies
G. Bruni, F. Ursini, F. Panessa +13
With their sizes larger than 0.7 Mpc, Giant Radio Galaxies (GRGs) are the largest individual objects in the Universe. To date, the reason why they reach such enormous extensions is…
Optical spectroscopy of local type-1 AGN LINERs
S. Cazzoli, I. Marquez, J. Masegosa +6
The Balmer emission originated in the broad line region (BLR) of active galactic nuclei (AGNs) could be either weak and difficult to detect, or even absent, for low luminosity AGNs…
Variable broad lines and outflow in the weak blazar PBC J2333.9-2343
L. Hernández-García, G. Vietri, F. Panessa +12
PBC J2333.9-2343 is a peculiar active nucleus with two giant radio lobes and a weak blazar-like nucleus at their center. In the present work we show new optical, UV, and X-ray data…
FERMI transient J1544-0649: a flaring radio-weak BL Lac
G. Bruni, F. Panessa, G. Ghisellini +6
On May 15th, 2017, the \emph{FERMI}/LAT gamma-ray telescope observed a transient source not present in any previous high-energy catalogue: J1544-0649. It was visible for two consec…
Hints on the gradual re-sizing of the torus in AGN by decomposing IRS/Spitzer spectra
O. González-Martín, J. Masegosa, A. Hernán-Caballero +12
Several authors have claimed that the less luminous active galactic nuclei (AGN) are not capable of sustaining the dusty torus structure. Thus, a gradual re-sizing of the torus is…
The X-ray variability of Seyfert 1.8/1.9 galaxies
Lorena Hernandez-Garcia, Josefa Masegosa, Omaira Gonzalez-Martin +3
Seyfert 1.8/1.9 are sources showing weak broad H-alpha components in their optical spectra. We aim at testing whether Seyfert 1.8/1.9 have similar properties at UV and X-ray wavele…
Unveiling the physics of low luminosity AGN through X-ray variability: LINER versus Seyfert 2
Lorena Hernandez-Garcia, Josefa Masegosa, Omaira Gonzalez-Martin +2
X-ray variability is very common in active galactic nuclei (AGN), but these variations may not occur similarly in different families of AGN. We aim to disentangle the structure of…
X-ray long-term variations in the low-luminosity AGN NGC835 and its circumnuclear emission
O. Gonzalez-Martin, L. Hernandez-Garcia, J. Masegosa +5
Obscured active galactic nuclei (AGNs) are thought to be very common in the Universe. Observations and surveys have shown that the number of sources increases for near galaxies and…
On the LINER nuclear obscuration, Compton-thickness and the existence of the dusty torus; Clues from Spitzer/IRS spectra
O. Gonzalez-Martin, J. Masegosa, I. Marquez +7
Most of the optically classified low ionisation narrow emission-line regions (LINERs) nuclei host an active galactic nuclei (AGN). However, how they fit into the unified model (UM)…
A multi-wavelength view of the central kiloparsec region in the Luminous Infrared Galaxy NGC1614
Rubén Herrero-Illana, Miguel Á. Pérez-Torres, Almudena Alonso-Herrero +9
The Luminous Infrared Galaxy NGC1614 hosts a prominent circumnuclear ring of star formation. However, the nature of the dominant emitting mechanism in its central ~100 pc is still…