MAGIC TeV gamma-ray observations of Markarian 421 during multiwavelength campaigns in 2006

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dc.contributor.authorAntoranz Canales, Pedro
dc.contributor.authorBarrio Uña, Juan Abel
dc.contributor.authorContreras González, José Luis
dc.contributor.authorFonseca González, María Victoria
dc.contributor.authorMiranda Pantoja, José Miguel
dc.contributor.authorNieto Castaño, Daniel
dc.date.accessioned2023-06-20T03:34:27Z
dc.date.available2023-06-20T03:34:27Z
dc.date.issued2010-09
dc.description© ESO 2010. We thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The support of the German BMBF and MPG, the Italian INFN and Spanish MICINN is gratefully acknowledged. This work was also supported by ETH Research Grant TH 34/043, by the Polish MNiSzW Grant N N203 390834, and by the YIP of the Helmholtz Gemeinschaft.
dc.description.abstractContext. Wide-range spectral coverage of blazar-type active galactic nuclei is of paramount importance for understanding the particle acceleration mechanisms assumed to take place in their jets. The Major Atmospheric Gamma Imaging Cerenkov (MAGIC) telescope participated in three multiwavelength (MWL) campaigns, observing the blazar Markarian (Mkn) 421 during the nights of April 28 and 29, 2006, and June 14, 2006. Aims. We analyzed the corresponding MAGIC very-high energy observations during 9 nights from April 22 to 30, 2006 and on June 14, 2006. We inferred light curves with sub-day resolution and night-by-night energy spectra. Methods. MAGIC detects gamma-rays by observing extended air showers in the atmosphere. The obtained air-shower images were analyzed using the standard MAGIC analysis chain. Results. A strong gamma-ray signal was detected from Mkn 421 on all observation nights. The flux (E > 250 GeV) varied on night-by-night basis between (0.92 +/- 0.11) x 10(-10) cm(-2) s(-1) (0.57 Crab units) and (3.21 +/- 0.15) x 10(-10) cm(-2) s(-1) (2.0 Crab units) in April 2006. There is a clear indication for intra-night variability with a doubling time of 36 +/- 10(stat) min on the night of April 29, 2006, establishing once more rapid flux variability for this object. For all individual nights gamma-ray spectra could be inferred, with power-law indices ranging from 1.66 to 2.47. We did not find statistically significant correlations between the spectral index and the flux state for individual nights. During the June 2006 campaign, a flux substantially lower than the one measured by the Whipple 10-m telescope four days later was found. Using a log-parabolic power law fit we deduced for some data sets the location of the spectral peak in the very-high energy regime. Our results confirm the indications of rising peak energy with increasing flux, as expected in leptonic acceleration models.
dc.description.departmentDepto. de Estructura de la Materia, Física Térmica y Electrónica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipGerman BMBF
dc.description.sponsorshipGerman MPG
dc.description.sponsorshipItalian INFN
dc.description.sponsorshipSpanish MICINN
dc.description.sponsorshipETH
dc.description.sponsorshipPolish MNiSzW
dc.description.sponsorshipYIP of the Helmholtz Gemeinschaft
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/22243
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dc.identifier.doi10.1051/0004-6361/200913945
dc.identifier.issn0004-6361
dc.identifier.officialurlhttp://dx.doi.org/10.1051/0004-6361/200913945
dc.identifier.relatedurlhttp://www.aanda.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/43919
dc.journal.titleAstronomy & Astrophysics
dc.language.isoeng
dc.publisherEDP Sciencies
dc.relation.projectIDTH 34/043
dc.relation.projectIDN N203 390834
dc.rights.accessRightsopen access
dc.subject.cdu537
dc.subject.cdu539.1
dc.subject.keywordAtmospheric Cherenkov Telescope
dc.subject.keywordActive Galaxy Markarian-421
dc.subject.keywordHigh-Energy Photons
dc.subject.keywordBL-LAC Objectc
dc.subject.keywordX-Ray
dc.subject.keywordCorrelated Variability
dc.subject.keywordParticle-Acceleration
dc.subject.keywordBlazar Markarian-421
dc.subject.keywordCrab-Nebula
dc.subject.keywordSpectra.
dc.subject.ucmElectrónica (Física)
dc.subject.ucmElectricidad
dc.subject.ucmFísica nuclear
dc.subject.unesco2202.03 Electricidad
dc.subject.unesco2207 Física Atómica y Nuclear
dc.titleMAGIC TeV gamma-ray observations of Markarian 421 during multiwavelength campaigns in 2006
dc.typejournal article
dc.volume.number519
dspace.entity.typePublication
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