A5087190106- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Neutrino Physics Research
- Pulsars and Gravitational Waves Research
- Atomic and Subatomic Physics Research
- Scientific Research and Discoveries
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Radiation Detection and Scintillator Technologies
- Atmospheric Ozone and Climate
- Radioactive Decay and Measurement Techniques
- Radioactivity and Radon Measurements
- Radiation Therapy and Dosimetry
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Stellar, planetary, and galactic studies
- Data-Driven Disease Surveillance
University of Turin
2014-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2015-2025
Istituto Nazionale di Fisica Nucleare
2014-2024
AlbaNova
2010-2021
Stockholm University
2011-2021
RWTH Aachen University
2016-2020
Laboratoire d’Annecy de Physique des Particules
2019-2020
Université Grenoble Alpes
2019-2020
Centre National de la Recherche Scientifique
2019-2020
Laboratoire d'Annecy-le-Vieux de Physique Théorique
2019
We present the fourth Fermi Large Area Telescope catalog (4FGL) of gamma-ray sources. Based on first eight years science data from Gamma-ray Space mission in energy range 50 MeV to 1 TeV, it is deepest yet this range. Relative 3FGL catalog, 4FGL has twice as much exposure well a number analysis improvements, including an updated model for Galactic diffuse emission, and two sets light curves (1-year 2-month intervals). The includes 5064 sources above 4 sigma significance, which we provide...
The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some most dark matter (DM) dominated objects known. We report on gamma-ray observations dSphs based 6 years Fermi Large Area Telescope data processed with new Pass 8 event-level analysis. None significantly detected in gamma rays, and we present upper limits DM annihilation cross section from a combined analysis 15 dSphs. These constraints among strongest robust to date lie below canonical thermal relic for mass $\lesssim$...
The γ-ray sky can be decomposed into individually detected sources, diffuse emission attributed to the interactions of Galactic cosmic rays with gas and radiation fields, a residual all-sky component commonly called isotropic background (IGRB). IGRB comprises all extragalactic emissions too faint or resolved in given survey, as well any foregrounds that are approximately isotropic. first measurement Large Area Telescope (LAT) on board Fermi Gamma-ray Space (Fermi) used 10 months sky-survey...
Abstract The region around the Galactic Center (GC) is now well established to be brighter at energies of a few GeV than what expected from conventional models diffuse gamma-ray emission and catalogs known sources. We study excess using 6.5 yr data Fermi Large Area Telescope. characterize uncertainty GC spectrum morphology due uncertainties in cosmic-ray source distributions propagation, distribution interstellar gas Milky Way, potential contribution bubbles. also evaluate properties...
Dark matter in the Milky Way may annihilate directly into gamma rays, producing a monoenergetic spectral line. Therefore, detecting such signature would be strong evidence for dark annihilation or decay. We search lines Fermi Large Area Telescope observations of halo energy range 200 MeV to 500 GeV using analysis methods from our most recent line searches. The main improvements relative previous works are use 5.8 years data reprocessed with Pass 8 event-level and additional resulting...
We present a catalog of sources detected above 10 GeV by the Fermi Large Area Telescope (LAT) in first 7 years data using Pass 8 event-level analysis. This is Third Catalog Hard Fermi-LAT Sources (3FHL), containing 1556 objects characterized - 2 TeV energy range. The sensitivity and angular resolution are improved factors 3 relative to previous LAT at same energies (1FHL). vast majority (79%) associated with extragalactic counterparts other wavelengths, including 16 located very high...
We present a catalog of sources detected above 50 GeV by the {\it Fermi}-Large Area Telescope (LAT) in 80 months data. The newly delivered Pass 8 event-level analysis allows detection and characterization GeV--2 TeV energy range. In this band, Fermi}-LAT has 360 sources, which constitute second hard (2FHL). improved angular resolution enables precise localization point ($\sim$1.7$'$ radius at 68 % C.~L.) spatially extended sources. find that 86 can be associated with counterparts other...
ABSTRACT Most of the celestial γ rays detected by Large Area Telescope (LAT) on board Fermi Gamma-ray Space originate from interstellar medium when energetic cosmic interact with nucleons and photons. Conventional point-source extended-source studies rely modeling this diffuse emission for accurate characterization. Here, we describe development Galactic Interstellar Emission Model (GIEM), which is standard adopted LAT Collaboration publicly available. This model based a linear combination...
We evaluate dark matter (DM) limits from cosmic-ray antiproton observations using the recent precise AMS-02 measurements. properly take into account propagation uncertainties, fitting DM and parameters at same time marginalizing over latter. find a significant indication of signal for masses near 80 GeV, with hadronic annihilation cross section close to thermal value, ⟨σv⟩≈3×10−26 cm3 s−1. Intriguingly, this is compatible interpretation Galactic center gamma-ray excess. Confirmation will...
We present a measurement of the cosmic-ray electron+positron spectrum between 7 GeV and 2 TeV performed with almost seven years data collected Fermi Large Area Telescope. find that is well fit by broken power law break energy at about 50 GeV. Above GeV, described single spectral index $3.07 \pm 0.02 \; (\text{stat+syst}) 0.04 (\text{energy measurement})$. An exponential cutoff lower than 1.8 excluded 95\% CL.
Abstract We report the discovery of GRB 221009A, highest flux gamma-ray burst (GRB) ever observed by Fermi Gamma-ray Burst Monitor (Fermi-GBM). This has continuous prompt emission lasting more than 600 s, which smoothly transitions to afterglow visible in Fermi-GBM energy range (8 keV–40 MeV), and total energetics higher any other sample. By using a variety new existing analysis techniques we probe spectral temporal evolution 221009A. find no prior trigger time ( t 0 ; 2022 October 9 at...
Abstract We present 294 pulsars found in GeV data from the Large Area Telescope (LAT) on Fermi Gamma-ray Space Telescope. Another 33 millisecond (MSPs) discovered deep radio searches of LAT sources will likely reveal pulsations once phase-connected rotation ephemerides are achieved. A further dozen optical and/or X-ray binary systems colocated with also harbor gamma-ray MSPs. This catalog thus reports roughly 340 and candidates, 10% all known pulsars, compared to ≤11 before Fermi. Half...
We have performed an analysis of the diffuse gamma-ray emission with Fermi Large Area Telescope in Milky Way Halo region searching for a signal from dark matter annihilation or decay. In absence robust signal, constraints are presented. consider both gamma rays produced directly annihilation/decay and by inverse Compton scattering e+e- annihilation/decay. Conservative limits derived requiring that does not exceed observed emission. A second set more stringent is based on modeling foreground...
We present the fourth Fermi Large Area Telescope catalog (4FGL) of gamma-ray sources. Based on first eight years science data from Gamma-ray Space mission in energy range 50 MeV to 1 TeV, it is deepest yet this range. Relative 3FGL catalog, 4FGL has twice as much exposure well a number analysis improvements, including an updated model for Galactic diffuse emission, and two sets light curves (1-year 2-month intervals). The includes 5064 sources above 4 sigma significance, which we provide...
The contribution of unresolved sources to the diffuse gamma-ray background could induce anisotropies in this emission on small angular scales. We analyze power spectrum measured by Fermi LAT at Galactic latitudes |b| > 30 deg four energy bins spanning 1 50 GeV. At multipoles \ell \ge 155, corresponding scales \lesssim 2 deg, above photon noise level is detected >99.99% CL 1-2 GeV, 2-5 and 5-10 GeV bins, >99% 10-50 Within each bin takes approximately same value all suggesting that it...
Global fits of primary and secondary cosmic-ray (CR) fluxes measured by AMS-02 have great potential to study CR propagation models search for exotic sources antimatter such as annihilating dark matter (DM). Previous studies antiprotons revealed a possible hint DM signal which, however, could be affected systematic uncertainties. To test the robustness signal, in this work we systematically two important uncertainties: antiproton production cross sections needed calculate source spectra...
We search for evidence of dark matter (DM) annihilation in the isotropic gamma-ray background (IGRB) measured with 50 months Fermi Large Area Telescope (LAT) observations. An improved theoretical description cosmological DM signal, based on two complementary techniques and assuming generic weakly interacting massive particle (WIMP) properties, renders more precise predictions compared to previous work. More specifically, we estimate cosmologically-induced intensity have an uncertainty a...
In this work we characterize the distribution of Dark Matter (DM) in Milky Way (MW), and its uncertainties, adopting well known "Rotation Curve" method. We perform a full marginalization over uncertainties Galactic Parameters lack knowledge on morphology baryonic components Galaxy. The local DM density ρ0 is constrained to range 0.3– 0.8 GeV/cm3 at 2 σ level, has strong positive correlation R0, distance from Center. not well-known value R0 thus, moment, major limitation determining ρ0....
We place new constraints on the contribution of blazars to large-scale isotropic gamma-ray background (IGRB) by jointly analyzing measured source count distribution ($\mathrm{log}N$-$\mathrm{log}S$) and intensity anisotropy IGRB. find that these measurements point a consistent scenario in which unresolved make $\ensuremath{\lesssim}20%$ IGRB at 1--10 GeV while accounting for majority energy band. These results indicate remaining fraction is made component with low level intrinsic anisotropy....
We present novel constraints on cosmic-ray propagation in the Galaxy using recent precise measurements of proton and helium spectra from AMS-02, together with preliminary AMS-02 data antiproton over ratio. To explore efficiently large (up to eleven-dimensional) parameter space we employ nested-sampling algorithm as implemented \textsc{MultiNest} package, interfaced \textsc{Galprop} code compute model-predicted spectra. use VOYAGER data, sampling local inter-stellar spectra, constrain solar...
ABSTRACT The Fermi Large Area Telescope (LAT) has an instantaneous field of view (FoV) covering <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo>∼</mml:mo> <mml:mn>1</mml:mn> <mml:mrow> <mml:mo stretchy="true">/</mml:mo> </mml:mrow> <mml:mn>5</mml:mn> </mml:math> the sky and it completes a survey entire in high-energy gamma-rays every 3 hr. It enables searches for transient phenomena over timescales from milliseconds to years. Among these could be...
We derive updated constraints on the Integrated Sachs-Wolfe (ISW) effect through cross-correlation of cosmic microwave background with galaxy surveys. improve respect to similar previous analyses in several ways. First, we use most recent versions extragalactic object catalogs: SDSS DR12 photometric redshift (photo-$z$) and 2MASS Photo-$z$ datasets, as well employed earlier for ISW, QSO photo-$z$ NVSS samples. Second, first time WISE~$\times$~SuperCOSMOS catalog, which allows us perform an...