A5045499683- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- High-pressure geophysics and materials
- Particle Detector Development and Performance
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Mechanics and Biomechanics Studies
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Galaxies: Formation, Evolution, Phenomena
- Experimental and Theoretical Physics Studies
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
Université Paris Cité
2016-2025
Laboratoire AstroParticule et Cosmologie
2019-2025
Centre National de la Recherche Scientifique
2015-2024
Astrophysique, Instrumentation et Modélisation
2014-2023
CEA Paris-Saclay
2014-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2023
Université Paris-Saclay
2018-2023
TU Dortmund University
2023
University of Łódź
2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2023
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...
(Abridged) We have conducted a detailed investigation of the broad-band spectral properties \gamma-ray selected blazars Fermi LAT Bright AGN Sample (LBAS). By combining our accurately estimated gamma-ray spectra with Swift, radio, infra-red, optical and other hard X-ray/gamma-ray data, collected within three months LBAS data taking period, we were able to assemble high-quality quasi-simultaneous Spectral Energy Distributions (SED) for 48 blazars.The SED these sources is similar that...
This catalog summarizes 117 high-confidence ⩾0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on Fermi satellite. Half are neutron stars discovered LAT through periodicity searches in and radio around unassociated source positions. The pulsars evenly divided into groups: millisecond pulsars, young radio-loud radio-quiet pulsars. We characterize pulse profiles energy spectra derive luminosities when distance information exists. Spectral...
Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) the sources of galactic cosmic rays, unequivocal evidence for acceleration protons in these objects is still lacking. When encounter interstellar material, they produce neutral pions, which turn decay into gamma rays. This offers a compelling way detect sites protons. The identification pion-decay has been difficult because high-energy electrons also via...
Abstract Double neutron star (DNS) systems represent extreme physical objects and the endpoint of an exotic journey stellar evolution binary interactions. Large numbers DNS their mergers are anticipated to be discovered using Square Kilometre Array searching for radio pulsars, high-frequency gravitational wave detectors (LIGO/VIRGO), respectively. Here we discuss all key properties systems, as well selection effects, combine latest observational data with new theoretical progress on various...
We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi-LAT catalog gamma-ray sources. Based on first twelve years science data in energy range from 50 MeV to 1 TeV, it contains 6658 The analysis improves that used 4FGL over eight data: more sources are fit with curved spectra, we introduce a robust spectral parameterization pulsars, and extend points TeV. parameters, distributions, associations updated all Light curves rebuilt yr intervals (not 2 month...
Abstract The Laser Interferometer Space Antenna (LISA) will be a transformative experiment for gravitational wave astronomy, and, as such, it offer unique opportunities to address many key astrophysical questions in completely novel way. synergy with ground-based and space-born instruments the electromagnetic domain, by enabling multi-messenger observations, add further discovery potential of LISA. next decade is crucial prepare community LISA’s first observations. This review outlines...
The grand challenges of contemporary fundamental physics---dark matter, dark energy, vacuum inflation and early universe cosmology, singularities the hierarchy problem---all involve gravity as a key component. And all gravitational phenomena, black holes stand out in their elegant simplicity, while harbouring some most remarkable predictions General Relativity: event horizons, ergoregions. hitherto invisible landscape Universe is being unveiled before our eyes: historical direct detection...
Abstract Detection of the IceCube-170922A neutrino coincident with flaring blazar TXS 0506+056, first and only ∼3 σ high-energy source association to date, offers a potential breakthrough in our understanding cosmic particles physics. We present comprehensive analysis 0506+056 during its state, using newly collected Swift , NuSTAR X-shooter data Fermi observations numerical models constrain blazar’s particle acceleration processes multimessenger (electromagnetic (EM) neutrino) emissions....
We present observations of the young supernova remnant (SNR) RX J1713.7−3946 with Fermi Large Area Telescope (LAT). clearly detect a source positionally coincident SNR. The is extended best-fit extension 055 ± 004 matching size non-thermal X-ray and TeV gamma-ray emission from remnant. positional coincidence allow us to identify LAT SNR J1713.7−3946. spectrum can be described by very hard power law photon index Γ = 1.5 0.1 that coincides in normalization steeper H.E.S.S.-detected at higher...
We provide an updated assessment of the power Cherenkov Telescope Array (CTA) to search for thermally produced dark matter at TeV scale, via associated gamma-ray signal from pair-annihilating particles in region around Galactic centre. find that CTA will open a new window discovery potential, significantly extending range robustly testable models given standard cuspy profile density distribution. Importantly, even cored profile, projected sensitivity be sufficient probe various...
High-mass X-ray binaries (HMXBs) are a particular class of high-energy sources that require multi-wavelength observational efforts to be properly characterised. New identifications and the refinement previous measurements regularly published in literature by independent teams researchers might, when they collected catalogue, offer tool for facilitating further studies HMXBs. We update instances HMXB catalogues Galaxy provide community easy access most complete set observables on Galactic In...
Microquasar Spotted Microquasars are binary star systems where a normal sheds matter onto neutron or black hole, generating x-ray radiation and jets of material moving at relativistic speeds. have proved difficult to detect in high-energy gamma rays (> 100 megaelectron volts). Using the Fermi Large Area Telescope, Abdo et al. (p. 1512 , published online 26 November; see Perspective by Bignami ) now report detection variable gamma-ray emission from microquasar Cygnus X-3. The flux is...
Novae are thermonuclear explosions on a white dwarf surface fueled by mass accreted from companion star. Current physical models posit that shocked expanding gas the nova shell can produce X-ray emission but at higher energies has not been widely expected. Here, we report Fermi Large Area Telescope detection of variable gamma-ray (0.1-10 GeV) recently-detected optical symbiotic star V407 Cygni. We propose material interacts with dense ambient medium red giant primary, and particles be...
We describe a uniform all-sky survey of bright blazars, selected primarily by their flat radio spectra, that is designed to provide large catalog likely gamma-ray AGN. The defined sample has 1625 targets with and X-ray properties similar those the EGRET spread uniformly across |b| > 10 deg sky. also report progress toward optical characterization sample; objects known R < 23, 85% have been classified 81% measured redshifts. One goal this program focus attention on most interesting...
We report on the discovery of \geq 100 MeV {\gamma} rays from binary system PSR B1259-63/LS 2883 using Large Area Telescope (LAT) board Fermi. The comprises a radio pulsar in orbit around Be star. LAT observations near apastron to ~ 60 days after time periastron, tp, 2010 December 15. No {\gamma}-ray emission was detected this source when it far periastron. Faint appeared as approached At tp + 30d, flux increased over period few peak 20-30 times that seen during pre-periastron period, but...
This is the first report of Fermi Gamma-Ray Space Telescope observations quasar 3C 454.3, which has been undergoing pronounced long-term outbursts since 2000. The data from Large Area Telescope, covering 2008 July 7–October 6, indicate strong, highly variable γ-ray emission with an average flux ∼3 × 10−6 photons cm−2 s−1, for energies >100 MeV. variable, distinct, symmetrically shaped flares increases by a factor several on timescale about 3 days. variability indicates compact region, and...
We report on the first detection of GeV high-energy gamma-ray emission from a young supernova remnant with Large Area Telescope aboard Fermi Gamma-ray Space Telescope. These observations reveal source no discernible spatial extension detected at significance level 12.2$\sigma$ above 500 MeV location that is consistent position explosion occurred around 1680 in Cassiopeia constellation - A. The flux and spectral shape are scenario which originates relativistic particles accelerated shell this...
Context. Globular clusters with their large populations of millisecond pulsars (MSPs) are believed to be potential emitters high-energy gamma-ray emission. The observation this emission provides a powerful tool assess the pulsar population cluster, is essential for understanding importance binary systems evolution globular clusters, and complementary insights into magnetospheric processes.
This Letter presents the first results from observations of LSI +61 303 using Large Area Telescope data Fermi Gamma-Ray Space between 2008 August and 2009 March. Our indicate variability that is consistent with binary period, emission being modulated at 26.6 +/- 0.5 days. constitutes detection orbital periodicity in high-energy gamma rays (20 MeV-100 GeV, HE). The light curve characterized by a broad peak after periastron, as well smaller just before apastron. spectrum best represented power...
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...
We use Very Long Baseline Interferometry to measure the proper motions of three black hole X-ray binaries (BHXBs). Using these results together with data from literature and Gaia-DR2 collate best available constraints on motion, parallax, distance systemic radial velocity 16 BHXBs, we determined their dimensional Galactocentric orbits. extended this analysis estimate probability distribution for potential kick (PKV) a BHXB system could have received formation. Constraining kicks imparted...
Abstract The Advanced Virgo detector has contributed with its data to the rapid growth of number detected GW signals in past few years, alongside two LIGO instruments. First during last month Observation Run 2 (O2) August 2017 (with, most notably, compact binary mergers GW170814 and GW170817), then full 3 (O3): an 11 months taking period, between April 2019 March 2020, that led addition 79 events catalog transient sources maintained by LIGO, now KAGRA. These discoveries manifold exploitation...
The X-ray nova XTE J1118+480 suffers minimal extinction (b = 62 degrees) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. (2000) conducted the first such study, which was centered on 2000 April 8 using UKIRT, EUVE, HST RXTE. On 18, Chandra Observatory obtained data coincident with a second set of observations all these same observatories. A 30 ks grating observation yielded spectrum high resolution sensitivity covering range 0.24-7 keV. Our...