Publications (37)
The Blazar Hadronic Code Comparison Project
Matteo Cerruti, Michael Kreter, Maria Petropoulou +15
Blazar hadronic models have been developed in the past decades as an alternative to leptonic ones. In hadronic models the gamma-ray emission is associated with synchrotron emission…
Gammapy: high level data analysis for extragalactic science cases with the Cherenkov Telescope Array
Julien Lefaucheur, Catherine Boisson, Zeljka Bosnjak +5
The Cherenkov Telescope Array (CTA) observatory will probe the non-thermal universe above 20 GeV up to several hundreds of TeV with a significant improvement in sensitivity and ang…
The H.E.S.S. Gravitational Wave and Gamma-Ray Burst Follow-Up Programs
Bernardo Cornejo, Halim Ashkar, Matteo Cerruti +4
Multi-wavelength and multi-messenger astrophysics have experienced rapid growth over the past decade, seeking a complete picture of different cosmic phenomena. Transient sources, i…
Quasi-periodic oscillations in the -ray light curves of bright active galactic nuclei
Helena X. Ren, Matteo Cerruti, Narek Sahakyan
The detection of quasi-periodic oscillations (QPOs) in the light curves of active galactic nuclei (AGNs) can provide insights into the physics of the super-massive black-holes (SMB…
Gammapy - A prototype for the CTA science tools
Christoph Deil, Roberta Zanin, Julien Lefaucheur +27
Gammapy is a Python package for high-level gamma-ray data analysis built on Numpy, Scipy and Astropy. It enables us to analyze gamma-ray data and to create sky images, spectra and…
The blazar TXS 0506+056 associated with a high-energy neutrino: insights into extragalactic jets and cosmic ray acceleration
S. Ansoldi, L. A. Antonelli, C. Arcaro +146
A neutrino with energy of 290 TeV, IceCube-170922A, was detected in coincidence with the BL Lac object TXS~0506+056 during enhanced gamma-ray activity, with chance coincidenc…
Simulations of high-energy neutrino emissions from blazars with the LeHa-Paris code
Francesco Carenini, Matteo Cerruti
The identification of astrophysical sources responsible for high-energy cosmic neutrinos has long been a challenge. A significant milestone was achieved with the blazar TXS 0506+05…
MAGIC and MWL monitoring of the blazar TXS 0506+056 in the 2018/2019 season
Konstancja Satalecka, Elisa Bernardini, Wrijupan Bhattacharyya +8
The gamma-ray blazar TXS 0506+056, was discovered in VHE gamma-rays by the MAGIC telescopes in 2017 in a follow-up campaign of a high energy neutrino event IceCube-170922A (IC+Ferm…
H.E.S.S. discovery of very-high-energy emission from the blazar PKS 0736+017: on the location of the -ray emitting region in FSRQs
Matteo Cerruti, Jean-Philippe Lenain, Heike Prokoph
With the installation of a new 28-m diameter imaging atmospheric Cherenkov telescope in the middle of the array, the H.E.S.S. instrument has entered since 2012 into its Phase II. T…
Characterization and classification of -ray bursts from blazars
Matteo Cerruti
Blazars are the most common sources of -ray photons in the extragalactic sky. Their -ray light curves are characterized by bright flaring episodes, similarly to what is obs…
Very-high-energy blazars: updates from VERITAS observations and multi-wavelength campaigns
Matteo Cerruti
VERITAS is an array of four 12-m atmospheric Cherenkov telescopes, designed to observe the very-high-energy (VHE; E 100 GeV) sky. Since 2007, it has detected more than 20 ext…
HEGS : Revisiting a decade of H.E.S.S. extragalactic observations
François Brun, David Sanchez, Andrew M. Taylor +2
During its first phase, from 2004 up to the end of 2012, the H.E.S.S. (High Energy Stereoscopic System) experiment observed the extragalactic skies for more than 2700 hours. These…
Extragalactic Observations with HESS: Past and Future
Andrew M. Taylor, David Sanchez, Matteo Cerruti
The present H.E.S.S. II era of the H.E.S.S. collaboration follows from the successful upgrade of the H.E.S.S. array, and the first published results obtained with this new instrume…
A mixed lepto-hadronic scenario for PKS 2155-304
Matteo Cerruti, Andreas Zech, Catherine Boisson +1
The models developed to describe the spectral energy distribution (SED) of blazars can be divided into leptonic or hadronic scenarios, according to the particles responsible for th…
TXS 0506+056-like blazar sources and their role as possible neutrino emitters
Ilaria Viale, Giacomo Principe, Chiara Righi +3
The interest in blazars as candidate neutrino emitters grew after the 3 evidence for a contemporaneous joint photon and neutrino emission from the flaring blazar TXS 0506+056 i…
Expected signatures from hadronic emission processes in the TeV spectra of BL Lac objects
Andreas Zech, Matteo Cerruti, Daniel Mazin
The wealth of recent data from imaging air Cherenkov telescopes (IACTs), ultra-high energy cosmic-ray experiments and neutrino telescopes have fuelled a renewed interest in hadroni…
Equipartition Gamma-Ray Blazars and the Location of the Gamma-Ray Emission Site in 3C 279
Charles D. Dermer, Matteo Cerruti, Benoit Lott +2
Blazar spectral models generally have numerous unconstrained parameters, leading to ambiguous values for physical properties like Doppler factor delta or fluid magnetic field B'. T…
Variability studies of active galactic nuclei from the long-term monitoring program with the Cherenkov Telescope Array
Guillaume Grolleron, Josefa Becerra González, Jonathan Biteau +13
Blazars are active galactic nuclei (AGN) with a relativistic jet oriented toward the observer. This jet is composed of accelerated particles which can display emission over the ent…
VERITAS long-term (2006-2014) observations of the BL Lac object 1ES 0806+524
Matteo Cerruti
The discovery of the high-frequency-peaked BL Lac object 1ES 0806+524 (z=0.138) as a source of very-high-energy (VHE, E>100 GeV) gamma-ray photons was announced in 2008 by the VERI…
VERITAS results from a three-year observing campaign on the BL Lac object 1ES 0229+200
Matteo Cerruti
The BL Lac object 1ES 0229+200 is a firmly established very-high-energy (VHE; E >100 GeV) source. Located at a redshift of 0.1396, its published VHE spectrum is particularly hard (…
Upper Limits From Five Years of VERITAS Blazar Observations
Matteo Cerruti
The VERITAS array of Cherenkov telescopes was used to observe ~130 blazars from 2007 to 2012. Of these, 25 were detected as very-high-energy (VHE; E > 100 GeV) sources. We present…
Unsupervised Classification of Gamma-ray Bursts from Blazars (GRBBLs) with Machine Learning
Matteo Cerruti
Blazars dominate the extragalactic -ray sky and show pronounced flares. Using public Fermi-LAT light curves for 732 blazars with secure redshifts, I implement an automated pipe…
High-energy neutrinos and gamma rays from winds and tori in active galactic nuclei
Susumu Inoue, Matteo Cerruti, Kohta Murase +1
Powerful winds with wide opening angles, likely driven by accretion disks around black holes (BHs), are observed in the majority of active galactic nuclei (AGN) and can play a cruc…
Multiwavelength correlation studies in the era of CTAO
Michael Zacharias, Elina Lindfors, Patrizia Romano +4
Correlations between various multiwavelength (MWL) bands are an intermittent feature in blazar light curves; that is, they are observed in some instances but not in others. With th…
Gamma-ray emission from the Seyfert galaxy NGC 4151: Multi-messenger implications for ultra-fast outflows
Enrico Peretti, Giada Peron, Francesco Tombesi +4
The nuclear activity typical of Seyfert galaxies can drive powerful winds where high-energy phenomena occur. In spite of their high power content, the number of such non-jetted act…
VERITAS detection of gamma-ray flaring activity from the BL Lac object 1ES 1727+502 during bright moonlight observations
Matteo Cerruti
During May 2013, a gamma-ray flare from the BL Lac object 1ES 1727+502 (z=0.055) has been detected with the VERITAS Cherenkov telescopes. This detection represents the first eviden…
Recent H.E.S.S. results on extra-galactic sources
Matteo Cerruti
Since the beginning of scientific operations in 2003, more than 20 extra-galactic sources have been detected with H.E.S.S. (High Energy Stereoscopic System) at very high energies (…
Constraining the parameter space of the one-zone synchrotron-self-Compton model for GeV-TeV detected BL Lac objects
Matteo Cerruti, Catherine Boisson, Andreas Zech
The one-zone synchrotron-self-Compton (SSC) model aims to describe the spectral energy distribution (SED) of BL Lac objects via synchrotron emission by a non-thermal population of…
Observations of the FSRQ 3C 279 during the flaring state of 2017 and 2018 with H.E.S.S
Gabriel Emery, Matteo Cerruti, Anton Dmytriiev +4
The Flat Spectrum Radio Quasar 3C 279 has been very active since a few years with multiple flaring events occurring at high energies. As part of the H.E.S.S. Target of Opportunity…
Leptonic and Hadronic Radiative Processes in Supermassive-Black-Hole Jets
Matteo Cerruti
Supermassive black holes lying in the center of galaxies can launch relativistic jets of plasma along their polar axis. The physics of black-hole jets is a very active research top…
Gamma-ray blazars near equipartition and the origin of the GeV spectral break in 3C 454.3
Matteo Cerruti, Charles D. Dermer, Benoit Lott +2
Observations performed with the Fermi-LAT telescope have revealed the presence of a spectral break in the GeV spectrum of flat-spectrum radio quasars (FSRQs) and other low- and int…
Neutrinos from interactions between the relativistic jet and large-scale structures of BL Lac objects investigated through their gamma-ray spectrum
Luca Foffano, Matteo Cerruti, Valerio Vittorini
Absorption and emission lines in the optical spectrum are typically used to investigate the presence of large-scale environments in active galactic nuclei (AGNs). BL Lac objects -…
Neutrinos from blazars
Matteo Cerruti
The evidence for joint gamma and neutrino emission from the blazar TXS 0506+056 has renewed interest in blazars as neutrino sources. The detection of neutrinos from blazars can be…
Lepto-hadronic modelling of blazar emission
Matteo Cerruti, Andreas Zech, Catherine Boisson +1
The characteristic double-bumped spectral energy distribution (SED) of blazars is explained by either leptonic or hadronic models. In the former, Inverse Compton emission dominates…
A Comprehensive Hadronic Code Comparison for Active Galactic Nuclei
Matteo Cerruti, Annika Rudolph, Maria Petropoulou +14
We perform the first dedicated comparison of five hadronic codes (AM, ATHEA, B13, LeHa-Paris, and LeHaMoC) that have been extensively used in modeling of the spectral energ…
Chasing Gravitational Waves with the Cherenkov Telescope Array
Jarred Gershon Green, Alessandro Carosi, Lara Nava +563
The detection of gravitational waves from a binary neutron star merger by Advanced LIGO and Advanced Virgo (GW170817), along with the discovery of the electromagnetic counterparts…
MAGIC eyes to the extreme: testing the blazar emission models on EHBLs
Elisa Prandini, Cornelia Arcaro, Vandad Fallah Ramazani +6
Extreme high-energy peaked BL Lac objects (EHBLs) are blazars whose synchrotron emission peaks at exceptionally high energies, above few keV, in the hard X-ray regime. So far, only…