Search results for "GALACTIC SOURCES"

showing 3 items of 3 documents

Early warning for VHE gamma-ray flares with the ARGO-YBJ detector

2011

Detecting and monitoring emissions from flaring gamma-ray sources in the very-high-energy (VHE, > 100 GeV) band is a very important topic in gamma-ray astronomy. The ARGO-YBJ detector is characterized by a high duty cycle and a wide field of view. Therefore, it is particularly capable of detecting flares from extragalactic objects. Based on fast reconstruction and analysis, real-time monitoring of 33 selected VHE extragalactic sources is implemented. Flares exceeding a specific threshold are reported timely, hence enabling the follow-up observation of these objects using more sensitive detectors, such as Cherenkov telescopes. (C) 2011 Elsevier B.V. All rights reserved.

Wide field of viewNuclear and High Energy PhysicsMonitoringAstrophysics::High Energy Astrophysical PhenomenaARGO-YBJFlaring phenomenonVHE extragalactic sourceAstrophysicsSettore FIS/05 - Astronomia E AstrofisicaInstrumentationSorgenti VHE extragalatticheArgoCherenkov radiationPhysicsFenomeni transientiWarning systemDetectorSettore FIS/01 - Fisica SperimentaleAstrophysics::Instrumentation and Methods for AstrophysicsGamma rayMonitoring Flaring PhenomenonAstronomyWide fieldDuty cycleAmpio campo di vistaFlaring phenomena VHE extragalactic sources Gamma Ray Bursts Large Field of view telescope ARGO-YBJGamma-ray burst
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Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment

2012

We report the observation of TeV gamma-rays from the Cygnus region using the ARGO-YBJ data collected from 2007 November to 2011 August. Several TeV sources are located in this region including the two bright extended MGRO J2019+37 and MGRO J2031+41. According to the Milagro data set, at 20 TeV MGRO J2019+37 is the most significant source apart from the Crab Nebula. No signal from MGRO J2019+37 is detected by the ARGO-YBJ experiment, and the derived flux upper limits at 90% confidence level for all the events above 600 GeV with medium energy of 3 TeV are lower than the Milagro flux, implying that the source might be variable and hard to be identified as a pulsar wind nebula. The only statist…

Astrophysics::High Energy Astrophysical Phenomenageneral – pulsars: individual (MGRO J2019+37 [Gamma rays]FluxFOS: Physical sciencesAstrophysics01 natural sciencesPulsar wind nebulageneral – pulsar0103 physical sciencesMILAGRO010303 astronomy & astrophysicsDETECTORArgoPhysicsCALIBRATIONHigh Energy Astrophysical Phenomena (astro-ph.HE)010308 nuclear & particles physicsMGRO J2031+41)Settore FIS/01 - Fisica SperimentaleGamma rayAstronomy and Astrophysicsindividual (MGRO J2019+37 MGRO J2031+41)PLANE3. Good healthMedium energyCrab Nebulagamma ray13. Climate actionSpace and Planetary ScienceGALACTIC SOURCESJ2032+4130Milagrogamma rays; general – pulsars; individual (MGRO J2019+37 MGRO J2031+41)EMISSIONAstrophysics - High Energy Astrophysical Phenomena
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IceCube Search for High-Energy Neutrino Emission from TeV Pulsar Wind Nebulae

2020

Pulsar wind nebulae (PWNe) are the main gamma-ray emitters in the Galactic plane. They are diffuse nebulae that emit nonthermal radiation. Pulsar winds, relativistic magnetized outflows from the central star, shocked in the ambient medium produce a multiwavelength emission from the radio through gamma-rays. Although the leptonic scenario is able to explain most PWNe emission, a hadronic contribution cannot be excluded. A possible hadronic contribution to the high-energy gamma-ray emission inevitably leads to the production of neutrinos. Using 9.5 yr of all-sky IceCube data, we report results from a stacking analysis to search for neutrino emission from 35 PWNe that are high-energy gamma-ray…

010504 meteorology & atmospheric sciencesHigh-energy astronomyAstrophysics::High Energy Astrophysical PhenomenaNeutrino astronomy; High energy astrophysicsFOS: Physical sciencesCosmic rayAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciences7. Clean energyPulsar0103 physical sciences010303 astronomy & astrophysicsAstrophysics::Galaxy Astrophysics0105 earth and related environmental sciencesPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)astro-ph.HEAstronomy and AstrophysicsGalactic planeCOSMIC-RAYSCRAB-NEBULACrab NebulaPhysics and AstronomyNeutrino astronomy13. Climate actionSpace and Planetary ScienceGALACTIC SOURCESDISCOVERYPhysique des particules élémentairesHigh Energy Physics::ExperimentNeutrinoNeutrino astronomyAstrophysics - High Energy Astrophysical PhenomenaHigh energy astrophysicsGAMMA-RAY EMISSIONLepton
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