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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)…
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…
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…
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…
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…
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…
The flat-spectrum radio quasar 3C 345 from the high to the low emission state
M. Berton, N. H. Liao, G. La Mura +17
We report simultaneous observations at different energy bands in radio, optical, UV, X-rays and rays of the flat-spectrum radio-quasar 3C 345. We built the light curve of the s…
Fermi observations of the LIGO event GW170104
Melissa Pesce-Rollins, Nicola Omodei, Dan Kocevski +3
We present the \emph{Fermi} Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) observations of the LIGO binary black hole merger (BBH) event GW170104. No candidate electr…
3FGLzoo. Classifying 3FGL Unassociated Fermi-LAT Gamma-ray Sources by Artificial Neural Networks
David Salvetti, Graziano Chiaro, Giovanni La Mura +1
In its first four years of operation, the Fermi Large Area Telescope (LAT) detected 3033 -ray emitting sources. In the Fermi-LAT Third Source Catalogue (3FGL) about 50% of the s…
Cosmic-ray electron+positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
LAT Collaboration, S. Abdollahi, M. Ackermann +97
We present a measurement of the cosmic-ray electron+positron spectrum between 7 GeV and 2 TeV performed with almost seven years of data collected with the Fermi Large Area Telescop…
The Fermi Galactic Center GeV Excess and Implications for Dark Matter
LAT Collaboration
The region around the Galactic center (GC) is now well established to be brighter at energies of a few GeV than expected from conventional models of diffuse gamma-ray emission and…
Relativistic plasmas in AGN jets - From synchrotron radiation to -ray emission
Giovanni La Mura, Giovanni Busetto, Stefano Ciroi +5
Relativistic jets of plasma are a key ingredient of many types of Active Galactic Nuclei (AGN). Today we know that AGNs are powered by the accretion of inter stellar material into…
Blazar Flaring Patterns (B-FlaP): Classifying Blazar Candidates of Uncertain type in the third Fermi-LAT catalog by Artificial Neural Networks
G. Chiaro, D. Salvetti, G. La Mura +3
The Fermi Large Area Telescope (LAT) is currently the most important facility for investigating the GeV -ray sky. With Fermi LAT more than three thousand -ray sources have be…
Evidence for periodicity in 43 year-long monitoring of NGC 5548
E. Bon, S. Zucker, H. Netzer +14
We present an analysis of 43 years (1972 to 2015) of spectroscopic observations of the Seyfert 1 galaxy NGC 5548. This includes 12 years of new unpublished observations (2003 to 20…
Broad-band properties of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies
L. Foschini, M. Berton, A. Caccianiga +27
We report about recent updates of broad-band properties of radio-loud narrow-line Seyfert 1 galaxies.
Multiwavelength survey of a sample of flat-spectrum radio-loud narrow-line Seyfert 1 galaxies
L. Foschini, M. Berton, A. Caccianiga +27
We report on a multiwavelength survey of a sample of 42 flat-spectrum radio-loud narrow-line Seyfert 1 galaxies (RLNLS1s). This is the largest known sample of this type of active g…
Optical counterparts of undetermined type -ray Active Galactic Nuclei with blazar-like Spectral Energy Distributions
G. La Mura, G. Chiaro, S. Ciroi +4
During its first four years of scientific observations, the Fermi Large Area Telescope (Fermi-LAT) detected 3033 -ray sources above a 4 significance level. Although most of t…
The Third Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
M. Ackermann, M. Ajello, W. Atwood +139
The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected between 100…
Fermi Large Area Telescope Third Source Catalog
LAT Collaboration
We present the third Fermi Large Area Telescope source catalog (3FGL) of sources in the 100 MeV-300 GeV range. Based on the first four years of science data from the Fermi Gamma-ra…
Properties of flat-spectrum radio-loud Narrow-Line Seyfert 1 Galaxies
L. Foschini, M. Berton, A. Caccianiga +27
We have conducted a multiwavelength survey of 42 radio loud narrow-1ine Seyfert 1 galaxies (RLNLS1s), selected by searching among all the known sources of this type and omitting th…
Complex Broad Emission Line Profiles of AGN - Geometry of the Broad Line Region
E. Bon, N. Gavrilovic, G. La Mura +1
The Broad Emission Lines (BELs) in spectra of type 1 Active Galactic Nuclei (AGN) can be very complex, indicating a complex Broad Line Region (BLR) geometry. According to the stand…