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The 2009 multiwavelength campaign on Mrk 421: variability and correlation studies

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.authorLópez Moya, Marcos
dc.contributor.authorMiranda Pantoja, José Miguel
dc.contributor.authorSatalecka, Konstanzja
dc.contributor.authorScapin, Valeria
dc.date.accessioned2023-06-18T06:46:40Z
dc.date.available2023-06-18T06:46:40Z
dc.date.issued2015-04
dc.description© ESO 2015. We would like to thank the referee for the useful comments that helped to improve the manuscript. We also thank Patricia Arévalo for helpful contributions and suggestions. The MAGIC collaboration 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, and the Japanese JSPS and MEXT is gratefully acknowledged. This work was also supported by the Centro de Excelencia Severo Ochoa SEV-2012-0234, CPAN CSD2007-00042 and MultiDark CSD2009- 00064 projects of the Spanish Consolider-Ingenio 2010 programme, by grant 268740 of the Academy of Finland, by the Croatian Science Foundation (HrZZ) Project 09/176 and the University of Rijeka Project 13.12.1.3.02, by the DFG Collaborative Research Centers SFB823/C4 and SFB876/C3, and by the Polish MNiSzW grant 745/N-HESS-MAGIC/2010/0. The VERITAS collaboration acknowledges support from the U.S. Department of Energy, the U.S. National Science Foundation and the Smithsonian Institution, by NSERC in Canada, by Science Foundation Ireland, and by STCF in the UK. We acknowledge the excellent work of the technical support at the FLWO and the collaboration institutions in the construction and operation of the instrument. The Fermi-LAT Collaboration acknowledges support from a number of agencies and institutes for both development and the operation of the LAT as well as scientific data analysis. These include NASA and DOE in the United States, CEA/Irfu and IN2P3/CNRS in France, ASI and INFN in Italy, MEXT, KEK, and JAXA in Japan, and the K. A. Wallenberg Foundation, the Swedish Research Council and the National Space Board in Sweden. Additional support from INAF in Italy and CNES in France for science analysis during the operations phase is also gratefully acknowledged. We acknowledge the use of public data from the Swift and RXTE data archives. The OVRO 40 m monitoring program is supported in part by NASA grants NNX08AW31G and NNX11A043G, and NSF grants AST-0808050 and AST-1109911. The Metsähovi team acknowledges the support from the Academy of Finland to our observing projects (numbers 212656, 210338, 121148, and others). The Abastumani Observatory team acknowledges financial support by the Shota Rustaveli National Science Foundation through project FR/577/6-320/13. The St. Petersburg University team acknowledges support from the Russian RFBR foundation via grant 09-02-00092. AZT-24 observations are made within an agreement between Pulkovo, Rome and Teramo observatories. This research is partly based on observations with the 100 m telescope of the MPIfR (Max-Planck-Institut fuer Radioastronomie) at Effelsberg, as well as with the Medicina and Noto telescopes operated by INAF–Istituto di Radioastronomia. M. Villata organized the optical-to-radio observations by GASP-WEBT as the president of the collaboration.
dc.description.abstractAims. We perform an extensive characterization of the broadband emission of Mrk 421, as well as its temporal evolution, during the non-flaring (low) state. The high brightness and nearby location (z=0.031) of Mrk 421 make it an excellent laboratory to study blazar emission. The goal is to learn about the physical processes responsible for the typical emission of Mrk 421, which might also be extended to other blazars that are located farther away and hence are more difficult to study. Methods. We performed a 4.5-month multi-instrument campaign on Mrk 421 between January 2009 and June 2009, which included VLBA, FGAMMA, GASP-WEBT, Swift, RXTE, Fermi-LAT, MAGIC, and Whipple, among other instruments and collaborations. This extensive radio to very-high-energy (VHE; E > 100 GeV) γ-ray dataset provides excellent temporal and energy coverage, which allows detailed studies of the evolution of the broadband spectral energy distribution. Results. Mrk421 was found in its typical (non-flaring) activity state, with a VHE flux of about half that of the Crab Nebula, yet the light curves show significant variability at all wavelengths, the highest variability being in the X-rays. We determined the power spectral densities (PSD) at most wavelengths and found that all PSDs can be described by power-laws without a break, and with indices consistent with pink/red-noise behavior. We observed a harder-when-brighter behavior in the X-ray spectra and measured a positive correlation between VHE and X-ray fluxes with zero time lag. Such characteristics have been reported many times during flaring activity, but here they are reported for the first time in the non-flaring state. We also observed an overall anti-correlation between optical/UV and X-rays extending over the duration of the campaign. Conclusions. The harder-when-brighter behavior in the X-ray spectra and the measured positive X-ray/VHE correlation during the 2009 multiwavelength campaign suggests that the physical processes dominating the emission during non-flaring states have similarities with those occurring during flaring activity. In particular, this observation supports leptonic scenarios as being responsible for the emission of Mrk 421 during non-flaring activity. Such a temporally extended X-ray/VHE correlation is not driven by any single flaring event, and hence is difficult to explain within the standard hadronic scenarios. The highest variability is observed in the X-ray band, which, within the one-zone synchrotron self-Compton scenario, indicates that the electron energy distribution is most variable at the highest energies.
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)
dc.description.sponsorshipGerman BMBF and MPG
dc.description.sponsorshipItalian INFN and INAF
dc.description.sponsorshipSwiss National Fund SNF
dc.description.sponsorshipJapanese JSPS and MEXT
dc.description.sponsorshipCentro de Excelencia Severo Ochoa
dc.description.sponsorshipSpanish Consolider-Ingenio 2010 programme
dc.description.sponsorshipAcademy of Finland
dc.description.sponsorshipCroatian Science Foundation (HrZZ
dc.description.sponsorshipUniversity of Rijeka
dc.description.sponsorshipDFG Collaborative Research Centers
dc.description.sponsorshipPolish MNiSzW
dc.description.sponsorshipU.S. Department of Energy
dc.description.sponsorshipU.S. National Science Foundation
dc.description.sponsorshipSmithsonian Institution
dc.description.sponsorshipNSERC in Canada
dc.description.sponsorshipScience Foundation Ireland
dc.description.sponsorshipSTCF in the UK
dc.description.sponsorshipNASA and DOE in the United States
dc.description.sponsorshipCEA/Irfu and IN2P3/CNRS in France
dc.description.sponsorshipASI and INFN in Italy
dc.description.sponsorshipMEXT, KEK, and JAXA in Japan
dc.description.sponsorshipK. A. Wallenberg Foundation, the Swedish Research Council and the National Space Board in Sweden
dc.description.sponsorshipINAF in Italy
dc.description.sponsorshipCNES in France
dc.description.sponsorshipNASA
dc.description.sponsorshipNSF
dc.description.sponsorshipShota Rustaveli National Science Foundation
dc.description.sponsorshipRussian RFBR foundation
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/33072
dc.identifier.doi10.1051/0004-6361/201424216
dc.identifier.issn0004-6361
dc.identifier.officialurlhttp://dx.doi.org/10.1051/0004-6361/201424216
dc.identifier.relatedurlhttp://www.aanda.org/
dc.identifier.urihttps://hdl.handle.net/20.500.14352/24143
dc.journal.titleAstronomy & Astrophysics
dc.language.isoeng
dc.publisherEDP Sciencies
dc.relation.projectIDSEV-2012-0234
dc.relation.projectIDCPAN CSD2007-00042
dc.relation.projectIDCSD2009- 00064
dc.relation.projectID268740
dc.relation.projectID09/176
dc.relation.projectID13.12.1.3.02
dc.relation.projectIDSFB823/C4
dc.relation.projectIDSFB876/C3
dc.relation.projectID745/N-HESS-MAGIC/2010/
dc.relation.projectIDNNX08AW31G
dc.relation.projectIDNNX11A043G
dc.relation.projectIDAST-0808050
dc.relation.projectIDAST-1109911
dc.relation.projectID212656
dc.relation.projectID210338
dc.relation.projectID121148
dc.relation.projectIDFR/577/6-320/13
dc.relation.projectID09-02-00092
dc.rights.accessRightsopen access
dc.subject.cdu537
dc.subject.keywordActive galactic nuclei
dc.subject.keywordS-ray variability
dc.subject.keywordLight curves
dc.subject.keywordOptical variability
dc.subject.keywordPower spectra
dc.subject.keywordTEV photons
dc.subject.keywordEmission
dc.subject.keywordBlazars
dc.subject.keywordMarkarian-421
dc.subject.keywordTelescope.
dc.subject.ucmElectricidad
dc.subject.ucmElectrónica (Física)
dc.subject.unesco2202.03 Electricidad
dc.titleThe 2009 multiwavelength campaign on Mrk 421: variability and correlation studies
dc.typejournal article
dc.volume.number576
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