0000000000851167

AUTHOR

E. De Oña Wilhelmi

showing 3 related works from this author

First Multi-wavelength Campaign on the Gamma-ray-loud Active Galaxy IC 310

2017

The extragalactic VHE gamma-ray sky is rich in blazars. These are jetted active galactic nuclei viewed at a small angle to the line-of-sight. Only a handful of objects viewed at a larger angle are known so far to emit above 100 GeV. Multi-wavelength studies of such objects up to the highest energies provide new insights into the particle and radiation processes of active galactic nuclei. We report the results from the first multi-wavelength campaign observing the TeV detected nucleus of the active galaxy IC 310, whose jet is observed at a moderate viewing angle of 10 deg - 20 deg. The multi-instrument campaign was conducted between 2012 Nov. and 2013 Jan., and involved observations with MAG…

Active galactic nucleusAstronomyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesEnergy fluxAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsGalaxies: active; Galaxies: individual: IC 310; Gamma rays: galaxies; Astronomy and Astrophysics; Space and Planetary Science01 natural scienceslaw.inventionlawGalaxies: individual: IC 3100103 physical sciencesindividual: IC 310 [galaxies]Blazar010303 astronomy & astrophysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)Physicsgalaxie [Gamma rays]010308 nuclear & particles physicsGamma rayAstronomy and AstrophysicsGalaxies: activeAstronomy and AstrophysicAstrophysics - Astrophysics of GalaxiesSynchrotrongamma rays: galaxies ; galaxies: active ; individual (IC 310)Gamma rays: galaxiesSpace and Planetary ScienceAstrophysics of Galaxies (astro-ph.GA)active [galaxies]galaxies [gamma rays]ComputingMethodologies_DOCUMENTANDTEXTPROCESSINGSpectral energy distributionddc:520Astrophysics - High Energy Astrophysical PhenomenaFermi Gamma-ray Space TelescopeFlare
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SAX J1808.4-3658, an accreting millisecond pulsar shining in gamma rays?

2016

We report the detection of a possible gamma-ray counterpart of the accreting millisecond pulsar SAX J1808.4-3658. The analysis of ~6 years of data from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope (Fermi-LAT) within a region of 15deg radius around the position of the pulsar reveals a point gamma-ray source detected at a significance of ~6 sigma (Test Statistic TS = 32), with position compatible with that of SAX J1808.4-3658 within 95% Confidence Level. The energy flux in the energy range between 0.6 GeV and 10 GeV amounts to (2.1 +- 0.5) x 10-12 erg cm-2 s-1 and the spectrum is well-represented by a power-law function with photon index 2.1 +- 0.1. We searched for si…

Astrophysics::High Energy Astrophysical PhenomenaPulsar planetEnergy fluxFOS: Physical sciencesGamma-rays: starAstrophysics01 natural sciencesBinary pulsarSettore FIS/05 - Astronomia E AstrofisicaSpitzer Space TelescopePulsarMillisecond pulsar0103 physical sciences010303 astronomy & astrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)010308 nuclear & particles physicsAstronomyAstronomy and AstrophysicsStars: neutronStars: individual: SAX J1808.4-3658Space and Planetary ScienceOrbital motionstars; Stars: individual: SAX J1808.4-3658; Stars: neutron; Space and Planetary Science; Astronomy and Astrophysics [Gamma-rays]Astrophysics - High Energy Astrophysical PhenomenaFermi Gamma-ray Space Telescope
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Black hole lightning due to particle acceleration at subhorizon scales

2015

Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry, but still suffer from insufficient angular resolution. An alternative method to resolve small structures is to measure the time variability of their emission. Here, we report on gamma-ray observations of the radio galaxy IC 310 obtained with the MAGIC telescopes revealing variability with doubling time scales faster than 4.8 min. Causality constrains the size of the emission region to be smaller than 20\% of the gravitational radius of its central black hole. We suggest that the emission is associated …

Black HolesRadio galaxyAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesAstrophysicsAstrophysics::Cosmology and Extragalactic AstrophysicsVery High Energy Gamma AstronomyBlack Holes Very High Energy Gamma Astronomy Active Galactic NucleiX-shaped radio galaxysupermassive black hole ; jet formation ; IC 310 ; MAGIC telescopesAstrophysics::Galaxy AstrophysicsPhysicsHigh Energy Astrophysical Phenomena (astro-ph.HE)astro-ph.HESupermassive black holeta115MultidisciplinaryPhysicsActive Galactic NucleiAstronomy and AstrophysicsGalaxyIntermediate-mass black holeStellar black holeElectrónicaFísica nuclearddc:500Spin-flipElectricidadAstrophysics - High Energy Astrophysical PhenomenaSchwarzschild radius
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