1.1k citations · 3.8k across the 57 of their papers we have counts for
58 papers
An optical perspective on early-stage AGN with extreme radio flares
Luca Crepaldi, Marco Berton, Benedetta Dalla Barba +4
In the last decade of Active Galactic Nuclei (AGN) monitoring programs, the Metsähovi Radio Observatory detected multiple times seven powerful flaring narrow-line Seyfert 1 (NLS1)…
Fermi-LAT Discovery of a Gamma-ray Outburst from the Peculiar Compact Steep Spectrum Radiogalaxy 3C 216
Federica Giacchino, Giovanni La Mura, Stefano Ciprini +3
3C 216 is an extragalactic radio source classified as a compact steep spectrum (CSS) object, associated with the source 4FGL J0910.0+4257 detected by the Large Area Telescope (LAT)…
A large jet narrow-line Seyfert 1 galaxy: observations from pc to 100 kpc scales
Sina Chen, Preeti Kharb, Silpa Sasikumar +11
We present new 1.5-8.5 GHz Very Long Baseline Array (VLBA) observations and 0.32-1.26 GHz Giant Meterwave Radio Telescope (GMRT) observations of J0354-1340, which is the only known…
Optical properties of two complementary samples of intermediate Seyfert galaxies
Benedetta Dalla Barba, Marco Berton, Luigi Foschini +3
We present preliminary results of the analysis of optical spectra of two complementary samples of Seyfert galaxies. The first sample was extracted from a selection of the 4th Fermi…
Identification of low energy neutral and charged cosmic ray events in large wide field observatories
L Apolinário, P. Assis, P. Brogueira +5
The lower energy thresholds of large wide-field gamma-ray observatories are often determined by their capability to deal with the very low-energy cosmic ray background. In fact, in…
The relation between optical and -ray emission in BL Lac sources
G. La Mura, J. Becerra Gonzalez, G. Chiaro +2
The relativistic jets produced by some Active Galactic Nuclei (AGNs) are among the most efficient persistent sources of non-thermal radiation and represent an ideal laboratory for…
Hunting extreme BL Lacertae blazars with Fermi-LAT
M. Nievas Rosillo, A. Domínguez, G. Chiaro +3
The emission of very-high-energy photons (VHE, E>100 GeV$) in blazars is closely connected to the production of ultra-relativistic particles and the role of these gamma-ray sources…
The Mercedes water Cherenkov detector
P. Assis, A. Bakalová, U. Barres de Almeida +13
The concept of a small, single-layer water Cherenkov detector, with three photomultiplier tubes (PMTs), placed at its bottom in a star configuration (\emph{Mercedes}…
A model-driven search for extreme BL Lacs among LAT BCU
M. Nievas Rosillo, G. Chiaro, A. Dominguez +1
The emission of very-high-energy photons (VHE, E100 GeV) in active galactic nuclei (AGN) is closely connected with the production of ultra-relativistic particles. Among AGN, the…
Gamma-Ray Burst detection prospects for next generation ground-based VHE facilities
G. La Mura, U. Barres de Almeida, R. Conceição +6
Gamma-ray Bursts (GRB) were discovered by satellite-based detectors as powerful sources of transient -ray emission. The Fermi satellite detected an increasing number of these ev…
4FGLzoo. Classifying Fermi-LAT uncertain gamma-ray sources by machine learning analysis
Chiaro G., Kovacevic M., La Mura G
Since 2008 August the Fermi Large Area Telescope (LAT) has provided continuous coverage of the gamma-ray sky yielding more than 5000 gamma-ray sources, but 54% of the detected sour…
The Radio Structure of the Narrow-Line Seyfert 1 Mrk 783 with VLBA and e-MERLIN
E. Congiu, P. Kharb, A. Tarchi +9
In this paper, we present the analysis of new radio and optical observations of the narrow-line Seyfert 1 galaxy Mrk 783. 1.6 GHz observations performed with the e-MERLIN interfero…
Searching for misaligned active galactic nuclei among blazar candidates in the Fourth Fermi-LAT catalog
G. Chiaro, G. La Mura, A. Dominguez +1
Radio-loud sources with blazar-like properties, but having a jet that does not directly point in the direction of the observer are among the most interesting classes of gamma-ray e…
Detection of VHE gamma-ray transients with monitoring facilities
G. La Mura, G. Chiaro, R. Conceiçao +3
The observation of Very High Energy gamma rays (VHE, E > 100 GeV) led us to the identification of extremely energetic processes and particle acceleration sites both within our Gala…
Line shapes in narrow-line Seyfert 1 galaxies: a tracer of physical properties?
M. Berton, I. Björklund, A. Lähteenmäki +4
Line profiles can provide fundamental information on the physics of active galactic nuclei (AGN). In the case of narrow-line Seyfert 1 galaxies (NLS1s) this is of particular import…
The sub-TeV transient Gamma-Ray sky: challenges and opportunities
G. La Mura, P. Assis, A. Blanco +29
The detection of gravitational waves and neutrinos from astrophysical sources with gamma-ray counterparts officially started the era of Multi-Messenger Astronomy. Their transient a…
The Southern Wide-Field Gamma-Ray Observatory (SWGO): A Next-Generation Ground-Based Survey Instrument for VHE Gamma-Ray Astronomy
P. Abreu, A. Albert, R. Alfaro +95
We describe plans for the development of the Southern Wide-field Gamma-ray Observatory (SWGO), a next-generation instrument with sensitivity to the very-high-energy (VHE) band to b…
Models of Optical Emission Lines To Investigate Narrow-Line Seyfert 1 Galaxies in Spectroscopic Databases
G. La Mura, D. Bastieri, M. Berton +6
Thanks to the execution of extensive spectroscopic surveys that have covered large fractions of the sky down to magnitudes as faint as , it has been possible to ident…
Hunting misaligned radio-loud AGN (MAGN) candidates among the uncertain -ray sources of the third Fermi-LAT Catalogue
G. Chiaro, M. Meyer, N. Alvarez Crespo +6
BL Lac Objects (BL Lacs) and Flat Spectrum Radio Quasars (FSRQs) are radio-loud active galaxies (AGNs) whose jets are seen at a small viewing angle (blazars), while Misaligned Acti…
Multi-messenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
The IceCube, Fermi-LAT, MAGIC +13
Individual astrophysical sources previously detected in neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neut…
Long-term monitoring of the broad-line region properties in a selected sample of AGN
Dragana Ilic, Alla I. Shapovalova, Luka C. Popovic +8
We present the results of the long-term optical monitoring campaign of active galactic nuclei (AGN) coordinated by the Special Astrophysical Observatory of the Russian Academy of S…
Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
C. J. Clark, H. J. Pletsch, J. Wu +18
Millisecond pulsars (MSPs) are old neutron stars that spin hundreds of times per second and appear to pulsate as their emission beams cross our line of sight. To date, radio pulsat…
Probing narrow-line Seyfert 1 galaxies in the southern hemisphere
S. Chen, M. Berton, G. La Mura +7
We present a new accurate catalog of narrow-line Seyfert 1 galaxies (NLS1s) in the southern hemisphere from the Six-degree Field Galaxy Survey (6dFGS) final data release, which is…
Multi-frequency databases for AGN investigation - Results and perspectives
Giovanni La Mura, Marco Berton, Sina Chen +5
Active Galactic Nuclei (AGNs) are characterized by emission of radiation over more than 10 orders of magnitude in frequency. Therefore, the execution of extensive surveys of the sk…