Search results for "Oggetti di tipo BL Lacertae"

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Long-term monitoring of the TeV emission from Mrk 421 with the ARGO-YBJ experiment

2011

ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It is operated with a high duty cycle and a large field of view. It continuously monitors the northern sky at energies above 0.3 TeV. In this paper, we report a long-term monitoring of Mrk 421 over the period from 2007 November to 2010 February. This source was observed by the satellite-borne experiments Rossi X-ray Timing Explorer and Swift in the X-ray band. Mrk 421 was especially active in the first half of 2008. Many flares are observed in both X-ray and gamma-ray bands simultaneously. The gamma-ray flux observed by ARGO-YBJ has a clear correlation with the X-ray flux. No lag between the X-r…

media_common.quotation_subjectAstrophysics::High Energy Astrophysical PhenomenaOggetti di tipo BL LacertaeFOS: Physical sciencesFluxAstrophysics01 natural sciences7. Clean energyindividual (Markarian 421) [BL Lacertae objects]Spectral lineGamma-rays Markarian 421 BL Lacertae Resistive Plate Chamberslaw.inventionlaw0103 physical sciencesRadiative transfer010303 astronomy & astrophysicsmedia_commonHigh Energy Astrophysical Phenomena (astro-ph.HE)Physics010308 nuclear & particles physicsMarkarian 421Settore FIS/01 - Fisica SperimentaleAstronomy and Astrophysicsgeneral [gamma ray]Synchrotron3. Good healthAir shower13. Climate actionSpace and Planetary ScienceDuty cycleSkyRaggi gammaSpectral energy distributionAstrophysics - High Energy Astrophysical Phenomena
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