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Preliminary Results of a New Deep Learning Method to Detect and Localize GRBs in the AGILE/GRID Sky Maps
N. Parmiggiani, A. Bulgarelli, A. Macaluso +12
AGILE is an ASI space mission launched in 2007 to study X-ray and gamma-ray phenomena in the energy range from keV to GeV. The AGILE Team developed a real-time an…
Finding high-redshift gamma-ray bursts in tandem near-infrared and optical surveys
S. Campana, G. Ghirlanda, R. Salvaterra +8
The race for the most distant object in the Universe has been played by long-duration gamma-ray bursts (GRBs), star-forming galaxies and quasars. GRBs took a temporary lead with th…
ASTRI Mini-Array Core Science at the Observatorio del Teide
S. Vercellone, C. Bigongiari, A. Burtovoi +84
The ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) Project led by the Italian National Institute for Astrophysics (INAF) is developing and will deploy at the Obse…
Testing particle acceleration models for BL LAC jets with the Imaging X-ray Polarimetry Explorer
L. Di Gesu, F. Tavecchio, I. Donnarumma +3
To determine if the recently launched Imaging X-ray Polarimetry Explorer (IXPE) can follow the polarization variations induced by different particle acceleration mechanisms in blaz…
An optical overview of blazars with LAMOST I: Hunting changing-look blazars and new redshift estimates
Harold A. Peña-Herazo, Francesco Massaro, Minfeng Gu +6
The extragalactic -rays sky observed by Fermi-Large Area Telescope (LAT) is dominated by blazars. In the fourth release of the Fermi-LAT Point Source Catalog (4FGL), are sources…
Optical spectroscopic observations of low-energy counterparts of Fermi-LAT gamma-ray sources
H. A. Peña-Herazo, R. A. Amaya-Almazán, F. Massaro +15
A significant fraction of all -ray sources detected by the Large Area Telescope aboard the \fer\ satellite is still lacking a low-energy counterpart. In addition, there is still…
ZBLLAC -- A spectroscopic database of BL Lacertae objects
M. Landoni, R. Falomo, S. Paiano +1
This paper describes the database of optical spectra of BL Lacertae (BLL) objects ZBLLAC available at the URL https://web.oapd.inaf.it/zbllac/. At the present date, it contains cal…
Probing shock acceleration in BL Lac jets through X-ray polarimetry: the time-dependent view
F. Tavecchio, M. Landoni, L. Sironi +1
Polarimetric measurements, especially if extended at high energy, are expected to provide important insights into the mechanisms underlying the acceleration of relativistic particl…
Looking at Blazar Light Curve Periodicities with Gaussian Processes
Stefano Covino, Marco Landoni, Angela Sandrinelli +1
Temporal analysis of blazar flux is a powerful tool to draw inferences about the emission processes and physics of these sources. In the most general case, the available light curv…
Optical spectroscopic observations of gamma-ray blazar candidates. X. Results from the 2018--2019 SOAR and OAN-SPM observations of blazar candidates of uncertain type
Raniere de Menezes, Raul A. Amaya-Almazán, Ezequiel J. Marchesini +14
The fourth Fermi Large Area Telescope Source Catalog (4FGL) lists over 5000 gamma-ray sources with statistical significance above 4. About 23% of the sources listed in this cata…
Optical spectroscopic observations of gamma-ray blazar candidates. IX. Optical archival spectra and further observations from SOAR and OAGH
H. A. Peña-Herazo, F. Massaro, V. Chavushyan +11
Nearly one-third of the sources in the -LAT catalogs lack a lower energy counterpart, hence being referred as unidentified/unassociated gamma-ray sources (UGSs). In order to…
Prospects for gamma-ray observations of narrow-line Seyfert 1 galaxies with the Cherenkov Telescope Array II. Gamma-gamma absorption in the broad-line region radiation fields
P. Romano, M. Böttcher, L. Foschini +3
Gamma-ray emitting narrow-line Seyfert 1 (-NLS1) galaxies possibly harbour relatively low-mass black holes (10-10 M) accreting close to the Eddington limit, an…
Probing the absorption of gamma-rays by IR radiation from the dusty torus in FSRQs with the Cherenkov Telescope Array
Giorgio Galanti, Marco Landoni, Fabrizio Tavecchio +1
Within the classical emission model, where the emission region is placed within the broad line region (BLR), flat spectrum radio quasars (FSRQs) were believed not to emit photons w…
Fundamental physics with blazar spectra: a critical appraisal
Giorgio Galanti, Fabrizio Tavecchio, Marco Landoni
Very-high-energy (VHE) BL Lac spectra extending above provide a unique opportunity for testing physics beyond the standard model of elementary particle and alternat…
Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array
M. Chernyakova, D. Malyshev, A. Paizis +20
We simulate the spectral behaviour of the non-transient gamma-ray binaries using archival observations as a reference. With this we test the CTA capability to measure the sources'…
Optical characterization of WISE selected blazar candidates
Raniere de Menezes, Harold A. Peña-Herazo, Ezequiel J. Marchesini +8
Over the last decade more than five thousand gamma-ray sources were detected by the Large Area Telescope (LAT) on board Fermi Gamma-ray Space Telescope. Given the positional uncert…
Unveiling the origin of the gamma-ray emission in NGC 1068 with the Cherenkov Telescope Array
Alessandra Lamastra, Fabrizio Tavecchio, Patrizia Romano +2
Several observations are revealing the widespread occurrence of mildly relativistic wide-angle AGN winds strongly interacting with the gas of their host galaxy. Such winds are pote…
Two new catalogs of blazar candidates in the WISE infrared sky
Raffaele D'Abrusco, Nuria Alvarez Crespo, Francesco Massaro +9
We present two catalogs of radio-loud candidate blazars whose WISE mid-infrared colors are selected to be consistent with the colors of confirmed gamma-ray emitting blazars. The fi…
Putting the hadron beam scenario for extreme blazars to the test with the Cherenkov Telescope Array
F. Tavecchio, P. Romano, M. Landoni +1
Hadron beams are invoked to explain the peculiar properties of a subclass of BL Lac objects, the so-called extreme BL Lacs (EHBLs). This scenario predicts a quite distinctive featu…
Swift data hint at a binary Super Massive Black Hole candidate at sub-parsec separation
P. Severgnini, C. Cicone, R. Della Ceca +10
Dual/binary Supermassive Black Hole (SMBH) systems are the inevitable consequence of the current Lambda Cold Dark Matter cosmological paradigm. In this context, we discuss here the…
High redshift BL Lac objects: spectroscopy of candidates
M. Landoni, S. Paiano, R. Falomo +2
We report on 16 BL Lacertae objects that were proposed to be at z > 1. We present spectroscopic observations secured at the 10.4m GTC that allowed us to assess the redshift of thes…
Probing dissipation mechanisms in BL Lac jets through X-ray polarimetry
F. Tavecchio, M. Landoni, L. Sironi +1
The dissipation of energy flux in blazar jets plays a key role in the acceleration of relativistic particles. Two possibilities are commonly considered for the dissipation processe…
The Gamma-ray Blazar Quest: new optical spectra, state of art and future perspectives
F. Massaro, N. Álvarez Crespo, R. D'Abrusco +13
We recently developed a procedure to recognize gamma-ray blazar candidates within the positional uncertainty regions of the unidentified/unassociated gamma-ray sources (UGSs). Such…
Optical archival spectra of blazar candidates of uncertain type in the 3 Fermi Large Area Telescope Catalog
N. Álvarez Crespo, F. Massaro, R. D'Abrusco +10
Despite the fact that blazars constitute the rarest class among active galactic nuclei (AGNs) they are the largest known population of associated -ray sources. Many of the -r…