A. Morselli
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View article: Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT
Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT Open
The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and (2) a leptonic extended component peaking at the solar edge…
View article: A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars
A Systematic Search for MeV–GeV Pulsar Wind Nebulae without Gamma-Ray Detected Pulsars Open
An increasing number of pulsar wind nebulae (PWNe) are being identified in the TeV band by ground-based Imaging Air Cherenkov Telescopes such that they constitute the dominant source class of Galactic TeV emitters. However, MeV–GeV PWN cou…
View article: Search for Kink Events in Variable Fermi-LAT Blazars
Search for Kink Events in Variable Fermi-LAT Blazars Open
This study explores the detection of quasiperiodic oscillations (QPOs) in blazars as a method to identify kink events within their jets, utilizing both γ-ray and polarized light observations. Focusing on a sample of nine blazars, we analyz…
View article: Numerical modelling with analytical estimation of the free parameter space of GRB afterglows: The case of GRB 221009A
Numerical modelling with analytical estimation of the free parameter space of GRB afterglows: The case of GRB 221009A Open
On date 9 th of October 2022, an exceptionally bright Gamma-Ray Burst, GRB 221009A, was detected by several observatories, both ground- and space-based. It has been the highest flux Gamma-Ray Burst ever observed, with an energy E iso ∼ 10 …
View article: Investigating Unassociated Fermi-LAT sources for the search of Gamma ray pulsars including Millisecond pulsars using semicoherent approch
Investigating Unassociated Fermi-LAT sources for the search of Gamma ray pulsars including Millisecond pulsars using semicoherent approch Open
The search for gamma-ray pulsars including millisecond pulsars (MSPs) among unassociated Fermi-Large Area Telescope (LAT) sources offers an opportunity to study these rapidly rotating, highly magnetized neutron stars. This work uses semi-c…
View article: Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations
Periodic Gamma-Ray Modulation of the Blazar PG 1553+113 Confirmed by Fermi-LAT and Multiwavelength Observations Open
A 2.1 yr periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in ∼7 yr of data from the Fermi Large Area Telescope. After 15 yr of Fermi sky-survey observations, doubling the tot…
View article: Search for Extended GeV Sources in the Inner Galactic Plane
Search for Extended GeV Sources in the Inner Galactic Plane Open
The recent detection of extended $γ$-ray emission around middle-aged pulsars is interpreted as inverse-Compton scattering of ambient photons by electron-positron pairs escaping the pulsar wind nebula, which are confined near the system by …
View article: Multi-wavelength observations of the lensed quasar PKS 1830$-$211 during the 2019 $γ$-ray flare
Multi-wavelength observations of the lensed quasar PKS 1830$-$211 during the 2019 $γ$-ray flare Open
PKS 1830$-$211 is a $γ$-ray emitting, high-redshift (z $= 2.507 \pm 0.002$), lensed flat-spectrum radio quasar. During the period mid-February to mid-April 2019, this source underwent a series of strong $γ$-ray flares that were detected by…
View article: Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare
Multiwavelength observations of the lensed quasar PKS 1830-211 during the 2019 γ-ray flare Open
PKS 1830 -211 is a γ-ray emitting, high-redshift (z =2.507 ± 0.002), lensed flat-spectrum radio quasar. During the period 2019 mid-February to mid-April, this source underwent a series of strong γ-ray flares that were detected by both AGIL…
View article: Indirect dark-matter search with gamma-rays experiments : status and future plans from 300 KeV to 100 TeV
Indirect dark-matter search with gamma-rays experiments : status and future plans from 300 KeV to 100 TeV Open
In the last decades an incredible amount of evidence for the existence of dark matter (DM) has been accumulating. At the same time, many efforts have been undertaken to try to identify what dark matter is made of.\n Indirect searches look …
View article: AGILE Gamma-Ray Detection of the Exceptional GRB 221009A
AGILE Gamma-Ray Detection of the Exceptional GRB 221009A Open
Gamma-ray emission in the MeV–GeV range from explosive cosmic events is of invaluable relevance to understanding physical processes related to the formation of neutron stars and black holes. Here we report on the detection by the AGILE sat…
View article: AGILE gamma-ray detection of the exceptional GRB 221009A
AGILE gamma-ray detection of the exceptional GRB 221009A Open
Gamma-ray emission in the MeV-GeV range from explosive cosmic events is of invaluable relevance to understanding physical processes related to the formation of neutron stars and black holes. Here we report on the detection by the AGILE sat…
View article: Dark matter searches in dwarf spheroidal galaxies with the Cherenkov Telescope Array
Dark matter searches in dwarf spheroidal galaxies with the Cherenkov Telescope Array Open
Dark matter (DM) is one of the major components in the Universe. However, at present its existence is still only inferred through indirect astronomical observations. DM particles can annihilate or decay, producing final-state Standard Mode…
View article: The OCRA International Cosmic Day
The OCRA International Cosmic Day Open
The INFN Outreach Cosmic Ray Activities (OCRA) project involves 24 divisions of the Institute all over Italy and offers activities for both students and teachers. The International Cosmic Day - ICD, organized by DESY, is one of the OCRA ac…
View article: The Fermi-LAT Lightcurve Repository*
The Fermi-LAT Lightcurve Repository* Open
The Fermi Large Area Telescope (LAT) lightcurve repository (LCR) is a publicly available, continually updated library of gamma-ray lightcurves of variable Fermi-LAT sources generated over multiple timescales. The Fermi-LAT LCR aims to prov…
View article: Search for dark matter with IACTs and the Cherenkov Telescope Array
Search for dark matter with IACTs and the Cherenkov Telescope Array Open
In the last decades an incredible amount of evidence for the existence of dark matter (DM) has been accumulating. At the same time, many efforts have been undertaken to try to identify what dark matter is made of. Indirect searches look at…
View article: The Fermi-LAT Light Curve Repository
The Fermi-LAT Light Curve Repository Open
The Fermi Large Area Telescope (LAT) light curve repository (LCR) is a\npublicly available, continually updated library of gamma-ray light curves of\nvariable Fermi-LAT sources generated over multiple timescales. The Fermi-LAT\nLCR aims to…
View article: The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope: Data Release 3 Open
An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 yr of E > 50…
View article: The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3
The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope -- Data Release 3 Open
An incremental version of the fourth catalog of active galactic nuclei (AGNs) detected by the Fermi-Large Area Telescope is presented. This version (4LAC-DR3) derives from the third data release of the 4FGL catalog based on 12 years of E>5…
View article: Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources
Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources Open
Cosmic rays are mostly composed of protons accelerated to relativistic speeds. When those protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma-rays. This offers a compelling way to identify th…
View article: AGILE Observations of GRB 220101A: A “New Year's Burst” with an Exceptionally Huge Energy Release
AGILE Observations of GRB 220101A: A “New Year's Burst” with an Exceptionally Huge Energy Release Open
We report the AGILE observations of GRB 220101A, which took place at the beginning of 2022 January 1 and was recognized as one of the most energetic gamma-ray bursts (GRBs) ever detected since their discovery. The AGILE satellite acquired …
View article: Exploring the MeV sky with a combined coded mask and Compton telescope: the Galactic Explorer with a Coded aperture mask Compton telescope (GECCO)
Exploring the MeV sky with a combined coded mask and Compton telescope: the Galactic Explorer with a Coded aperture mask Compton telescope (GECCO) Open
The sky at MeV energies is currently poorly explored. Here we present an innovative mission concept that builds upon the heritage of past and current missions improving the sensitivity and, very importantly, the angular resolution. This co…
View article: Incremental Fermi Large Area Telescope Fourth Source Catalog
Incremental Fermi Large Area Telescope Fourth Source Catalog Open
We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi Large Area Telescope (LAT) catalog of γ -ray sources. Based on the first 12 years of science data in the energy range from 50 MeV to 1 TeV, it contains 66…
View article: The Second AGILE MCAL Gamma-Ray Burst Catalog: 13 yr of Observations
The Second AGILE MCAL Gamma-Ray Burst Catalog: 13 yr of Observations Open
We present the results of a systematic search and analysis of GRBs detected by the Astrorivelatore Gamma ad Immagini LEggero (AGILE) MiniCALorimeter (MCAL; 0.4–100 MeV) over a time frame of 13 yr, from 2007 to 2020 November. The MCAL GRB s…
View article: AGILE Observations of the LIGO-Virgo Gravitational-wave Events of the GWTC-1 Catalog
AGILE Observations of the LIGO-Virgo Gravitational-wave Events of the GWTC-1 Catalog Open
We present a comprehensive review of AGILE follow-up observations of the Gravitational Wave (GW) events and the unconfirmed marginal triggers reported in the first LIGO-Virgo (LV) Gravitational Wave Transient Catalog (GWTC-1). For seven GW…
View article: Gamma Rays from Fast Black-hole Winds
Gamma Rays from Fast Black-hole Winds Open
Massive black holes at the centers of galaxies can launch powerful wide-angle winds that, if sustained over time, can unbind the gas from the stellar bulges of galaxies. These winds may be responsible for the observed scaling relation betw…
View article: Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data Open
We present the first Fermi Large Area Telescope (LAT) catalog of long-term γ -ray transient sources (1FLT). This comprises sources that were detected on monthly time intervals during the first decade of Fermi-LAT operations. The monthly ti…