Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC

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dc.contributor.authorBarrio Uña, Juan Abel
dc.contributor.authorContreras González, José Luis
dc.contributor.authorDomínguez Díaz, Alberto
dc.contributor.authorCarreto Fidalgo, David Friedrich
dc.contributor.authorFonseca González, Victoria
dc.contributor.authorHoang, Kim Dinh
dc.contributor.authorLópez Moya, Marcos
dc.contributor.authorNievas Rosillo, Mireia
dc.contributor.authorPeñil del Campo, Pablo
dc.contributor.authorSaha, Lab
dc.contributor.authorotros, ...
dc.date.accessioned2023-06-17T13:19:51Z
dc.date.available2023-06-17T13:19:51Z
dc.date.issued2018-09-25
dc.description© ESO 2018. Artículo firmado por 154 autores. We would like to thank the Instituto de Astrofísica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The financial support of the German BMBF and MPG, the Italian INFN and INAF, the Swiss National Fund SNF, the ERDF under the Spanish MINECO (FPA2015-69818-P, FPA2012-36668, FPA2015-68378-P, FPA2015-69210-C6-2-R, FPA2015-69210-C6-4-R, FPA2015-69210-C6-6-R, AYA2015-71042-P, AYA2016-76012-C3-1-P, ESP2015-71662-C2-2-P, CSD2009-00064), and the Japanese JSPS and MEXT is gratefully acknowledged. This work was also supported by the Spanish Centro de Excelencia "Severo Ochoa" SEV-2012-0234 and SEV-2015-0548, and Unidad de Excelencia "María de Maeztu" MDM-2014-0369, by the Croatian Science Foundation (HrZZ) Project IP-2016-06-9782 and the University of Rijeka Project 13.12.1.3.02, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, the Polish National Research Centre grant UMO-2016/22/M/ST9/00382 and by the Brazilian MCTIC, CNPq and FAPERJ. We would like to thank F. Rieger for useful discussions.
dc.description.abstractWe report on the detection of flaring activity from the Fanaroff-Riley I radio galaxy NGC 1275 in very-high-energy (VHE, E> 100 GeV) gamma rays with the Major Atmospheric Gamma Imaging Cherenkov (MAGIC) telescopes. The observations were performed between 2016 September and 2017 February, as part of a monitoring programme. The brightest outburst, with similar to 1.5 times the Crab Nebula flux above 100 GeV (C.U.), was observed during the night between 2016 December 31 and 2017 January 1. The flux is fifty times higher than the mean flux previously measured in two observational campaigns between 2009 October and 2010 February and between 2010 August and 2011 February. Significant variability of the day-by-day light curve was measured. The shortest flux-doubling timescale was found to be of (611 +/- 101) min. The spectra calculated for this period are harder and show a significant curvature with respect to the ones obtained in the previous campaigns. The combined spectrum of the MAGIC data during the strongest flare state and simultaneous data from the Fermi-LAT around 2017 January 1 follows a power law with an exponential cutoff at the energy (492 +/- 35) GeV. We further present simultaneous optical flux density measurements in the R-band obtained with the Kungliga Vetenskaps Akademien (KVA) telescope and investigate the correlation between the optical and gamma-ray emission. Due to possible internal pair-production, the fast flux variability constrains the Doppler factor to values that are inconsistent with a large viewing angle as observed in the radio band. We investigate different scenarios for the explanation of fast gamma-ray variability, namely emission from magnetospheric gaps, relativistic blobs propagating in the jet (mini-jets), or an external cloud (or star) entering the jet. We find that the only plausible model to account for the luminosities here observed would be the production of gamma rays in a magnetospheric gap around the central black hole, only in the eventuality of an enhancement of the magnetic field threading the hole from its equipartition value with the gas pressure in the accretion flow. The observed gamma-ray flare therefore challenges all the discussed models for fast variability of VHE gamma-ray emission in active galactic nuclei.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Economía y Competitividad (MINECO)/FEDER
dc.description.sponsorshipUnidad de Excelencia "Maria de Maeztu"
dc.description.sponsorshipCentro de Excelencia "Severo Ochoa"
dc.description.sponsorshipGerman BMBF
dc.description.sponsorshipGerman MPG
dc.description.sponsorshipItalian INFN
dc.description.sponsorshipItalian INAF
dc.description.sponsorshipSwiss National Fund SNF
dc.description.sponsorshipJapanese JSPS
dc.description.sponsorshipJapanese MEXT
dc.description.sponsorshipCroatian Science Foundation (HrZZ) Project
dc.description.sponsorshipCroatian University of Rijeka Project
dc.description.sponsorshipDFG Collaborative Research Centers
dc.description.sponsorshipPolish National Research Centre grant
dc.description.sponsorshipBrazilian MCTIC
dc.description.sponsorshipBrazilian CNPq
dc.description.sponsorshipBrazilian FAPERJ
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/51280
dc.identifier.doi10.1051/0004-6361/201832895
dc.identifier.issn1432-0746
dc.identifier.officialurlhttps://doi.org/10.1051/0004-6361/201832895
dc.identifier.relatedurlhttps://www.aanda.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/13104
dc.journal.titleAstronomy & astrophysics
dc.language.isoeng
dc.publisherEDP Sciences S A
dc.relation.projectIDFPA2015-69818-P; FPA2012-36668; FPA2015-68378-P; FPA2015-69210-C6-2-R; FPA2015-69210-C6-4-R; FPA2015-69210-C6-6-R; AYA2015-71042-P; AYA2016-76012-C3-1-P; ESP2015-71662-C2-2-P; CSD2009-00064
dc.relation.projectIDSEV-2012-0234
dc.relation.projectIDSEV-2015-0548
dc.relation.projectIDMDM-2014-0369
dc.relation.projectIDIP-2016-06-9782
dc.relation.projectID13.12.1.3.02
dc.relation.projectIDSFB823/C4
dc.relation.projectIDSFB876/C3
dc.relation.projectIDUMO-2016/22/M/ST9/00382
dc.rights.accessRightsopen access
dc.subject.cdu539.1
dc.subject.keywordFast tev variability
dc.subject.keywordRadio galaxy
dc.subject.keywordCrab-nebula
dc.subject.keywordBlack-hole
dc.subject.keywordEnergy
dc.subject.keywordBlazars
dc.subject.keywordEmission
dc.subject.keywordCounterjet
dc.subject.keywordDiscovery
dc.subject.keywordNGC-1275
dc.subject.ucmFísica nuclear
dc.subject.unesco2207 Física Atómica y Nuclear
dc.titleGamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC
dc.typejournal article
dc.volume.number617
dspace.entity.typePublication
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