Unveiling the complex correlation patterns in Mrk 421

the MAGIC; FACT; Fermi-LAT Collaborations and multi-wavelength collaborators

Unveiling the complex correlation patterns in Mrk 421

the MAGIC
, FACT
, Fermi-LAT Collaborations and multi-wavelength collaborators

ETH Zurich
Max-Planck-Institut für Physik
Instituto de Astrofisica de Canarias
and Physics University of Udine
ICRANet
Istituto di Astrofisica e Planetologia Spaziali (IAPS)
The Barcelona Institute of Science and Technology
University of Tokyo
University of Dortmund
University of Zagreb, Faculty of Electrical Engineering and Computing
IPARCOS-UCM (Instituto de Física de Partículas y del Cosmos)
Centro Brasileiro de Pesquisas Fisicas
University of Padova
University of Lodz
University of Siena
c/o DESY
Instituto de Astrofísica de Andalucía-CSIC
University of Pisa
University of Barcelona
Yerevan Physics Institute
Centro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)
Port d'Informació Científica (PIC)
University of Turin
Politecnico di Bari
University of Rijeka
University of Würzburg
University of Turku
University of São Paulo
Hiroshima University
National Academy of Sciences of Armenia
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split
Josip Juraj Strossmayer University of Osijek
Kyoto University
Tokai University
University of Trieste
Saha Institute of Nuclear Physics
Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences
Yamagata University
University of Oulu
University of Bologna
Ruđer Bošković Institute
INFN Sezione di Perugia
INFN Roma Tor Vergata
Konan University
University of Geneva
RWTH Aachen University
INAF Istituto di Radioastronomia
NASA Goddard Space Flight Center
Biochemical and Environmental Engineering
Yale University
Yale University
Stanford University
Space Science Data Center (SSDC)-ASI
Osservatorio Astronomico di Roma
Science and Research Directorate
Aalto University
Universidad de Concepción
ESAC campus
Aryabhatta Research Institute of Observational Sciences
Hellas (FORTH)
University of Crete
Institute of Astronomy and NAO
University of Shumen
Sofia University St. Kliment Ohridski
Astronomical Observatory Belgrade
Saint Petersburg State University
Russian Academy of Sciences
Crimean Astrophysical Observatory RAS
Special Astrophysical Observatory, Russian Academy of Sciences
National Central University
Brigham Young University
University of Colorado at Denver
Boston University
Hans-Haffner-Sternwarte (Hettstadt)
EPT Observatories
INAF
Abastumani Astrophysical Observatory
Landessternwarte Heidelberg
Samtskhe-Javakheti State University
Kazan Federal University
INAF Istituto di Radioastronomia
Osservatorio Astronomico Sirio

Résultats de recherche: Contribution à un journal › Article de conférence › Revue par des pairs

Résumé

The blazar Mrk 421 (redshift z = 0.031) is one of the brightest and closest BL Lac type objects, making it an ideal target to probe blazar physics. We report on an extensive multi-wavelength observing campaign in 2017, during which the intra-band correlation patterns show some disparity and complex behaviours. Observations from several instruments are used to achieve an optimal temporal coverage from radio to TeV energies. In particular, four multi-hour NuSTAR observations organised simultaneously with MAGIC allow to obtain a precise measurement of the falling segments of the two spectral components. A detailed investigation of the very-high-energy (VHE; > 100 GeV) versus X-ray flux correlation is performed, by binning the data into several sub-energy bands. A positively correlated variability is observed, but the correlation characteristics change substantially across the various bands probed. Furthermore, during the simultaneous MAGIC and NuSTAR observations a clear change of the Compton dominance is detected without a simultaneous change in the synchrotron regime, indicating "orphan gamma-ray activity". We also investigate an intriguing bright flare at VHE without a substantial flux increase in the X-rays. Within a leptonic scenario, this behaviour is best explained by the appearance of a second population of highly-energetic electrons spanning a narrow range of energies. Finally, our multi-wavelength correlation study also reveals an anti-correlation between the UV/optical and X-ray bands at a significance level above 3σ.

langue originale	Anglais
Numéro d'article	834
journal	Proceedings of Science
Volume	395
état	Publié - 18 mars 2022
Evénement	37th International Cosmic Ray Conference, ICRC 2021 - Virtual, Berlin, Allemagne Durée: 12 juil. 2021 → 23 juil. 2021

Contient cette citation

@article{b3c4a8aea45b4ce28b908cc7cc62d829,

title = "Unveiling the complex correlation patterns in Mrk 421",

abstract = "The blazar Mrk 421 (redshift z = 0.031) is one of the brightest and closest BL Lac type objects, making it an ideal target to probe blazar physics. We report on an extensive multi-wavelength observing campaign in 2017, during which the intra-band correlation patterns show some disparity and complex behaviours. Observations from several instruments are used to achieve an optimal temporal coverage from radio to TeV energies. In particular, four multi-hour NuSTAR observations organised simultaneously with MAGIC allow to obtain a precise measurement of the falling segments of the two spectral components. A detailed investigation of the very-high-energy (VHE; > 100 GeV) versus X-ray flux correlation is performed, by binning the data into several sub-energy bands. A positively correlated variability is observed, but the correlation characteristics change substantially across the various bands probed. Furthermore, during the simultaneous MAGIC and NuSTAR observations a clear change of the Compton dominance is detected without a simultaneous change in the synchrotron regime, indicating {"}orphan gamma-ray activity{"}. We also investigate an intriguing bright flare at VHE without a substantial flux increase in the X-rays. Within a leptonic scenario, this behaviour is best explained by the appearance of a second population of highly-energetic electrons spanning a narrow range of energies. Finally, our multi-wavelength correlation study also reveals an anti-correlation between the UV/optical and X-ray bands at a significance level above 3σ.",

author = "\{the MAGIC\} and FACT and \{Fermi-LAT Collaborations and multi-wavelength collaborators\} and A. Arbet-Engels and D. Paneque and L. Heckmann and Acciari, \{V. A.\} and S. Ansoldi and Antonelli, \{L. A.\} and M. Artero and K. Asano and D. Baack and A. Babi{\'c} and A. Baquero and \{Barres de Almeida\}, U. and Barrio, \{J. A.\} and I. Batkovi{\'c} and \{Becerra Gonz{\'a}lez\}, J. and W. Bednarek and L. Bellizzi and E. Bernardini and M. Bernardos and A. Berti and J. Besenrieder and W. Bhattacharyya and C. Bigongiari and A. Biland and O. Blanch and H. B{\"o}kenkamp and G. Bonnoli and Bo{\v s}njak and G. Busetto and R. Carosi and G. Ceribella and M. Cerruti and Y. Chai and A. Chilingarian and S. Cikota and Colak, \{S. M.\} and E. Colombo and Contreras, \{J. L.\} and J. Cortina and S. Covino and G. D'Amico and V. D'Elia and \{Da Vela\}, P. and F. Dazzi and \{De Angelis\}, A. and \{De Lotto\}, B. and M. Delfino and J. Delgado and \{Delgado Mendez\}, C. and D. Horan",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons.; 37th International Cosmic Ray Conference, ICRC 2021 ; Conference date: 12-07-2021 Through 23-07-2021",

year = "2022",

month = mar,

day = "18",

language = "English",

volume = "395",

journal = "Proceedings of Science",

issn = "1824-8039",

}

TY - JOUR

T1 - Unveiling the complex correlation patterns in Mrk 421

AU - the MAGIC

AU - FACT

AU - Fermi-LAT Collaborations and multi-wavelength collaborators

AU - Arbet-Engels, A.

AU - Paneque, D.

AU - Heckmann, L.

AU - Acciari, V. A.

AU - Ansoldi, S.

AU - Antonelli, L. A.

AU - Artero, M.

AU - Asano, K.

AU - Baack, D.

AU - Babić, A.

AU - Baquero, A.

AU - Barres de Almeida, U.

AU - Barrio, J. A.

AU - Batković, I.

AU - Becerra González, J.

AU - Bednarek, W.

AU - Bellizzi, L.

AU - Bernardini, E.

AU - Bernardos, M.

AU - Berti, A.

AU - Besenrieder, J.

AU - Bhattacharyya, W.

AU - Bigongiari, C.

AU - Biland, A.

AU - Blanch, O.

AU - Bökenkamp, H.

AU - Bonnoli, G.

AU - Bošnjak,

AU - Busetto, G.

AU - Carosi, R.

AU - Ceribella, G.

AU - Cerruti, M.

AU - Chai, Y.

AU - Chilingarian, A.

AU - Cikota, S.

AU - Colak, S. M.

AU - Colombo, E.

AU - Contreras, J. L.

AU - Cortina, J.

AU - Covino, S.

AU - D'Amico, G.

AU - D'Elia, V.

AU - Da Vela, P.

AU - Dazzi, F.

AU - De Angelis, A.

AU - De Lotto, B.

AU - Delfino, M.

AU - Delgado, J.

AU - Delgado Mendez, C.

AU - Horan, D.

PY - 2022/3/18

Y1 - 2022/3/18

N2 - The blazar Mrk 421 (redshift z = 0.031) is one of the brightest and closest BL Lac type objects, making it an ideal target to probe blazar physics. We report on an extensive multi-wavelength observing campaign in 2017, during which the intra-band correlation patterns show some disparity and complex behaviours. Observations from several instruments are used to achieve an optimal temporal coverage from radio to TeV energies. In particular, four multi-hour NuSTAR observations organised simultaneously with MAGIC allow to obtain a precise measurement of the falling segments of the two spectral components. A detailed investigation of the very-high-energy (VHE; > 100 GeV) versus X-ray flux correlation is performed, by binning the data into several sub-energy bands. A positively correlated variability is observed, but the correlation characteristics change substantially across the various bands probed. Furthermore, during the simultaneous MAGIC and NuSTAR observations a clear change of the Compton dominance is detected without a simultaneous change in the synchrotron regime, indicating "orphan gamma-ray activity". We also investigate an intriguing bright flare at VHE without a substantial flux increase in the X-rays. Within a leptonic scenario, this behaviour is best explained by the appearance of a second population of highly-energetic electrons spanning a narrow range of energies. Finally, our multi-wavelength correlation study also reveals an anti-correlation between the UV/optical and X-ray bands at a significance level above 3σ.

AB - The blazar Mrk 421 (redshift z = 0.031) is one of the brightest and closest BL Lac type objects, making it an ideal target to probe blazar physics. We report on an extensive multi-wavelength observing campaign in 2017, during which the intra-band correlation patterns show some disparity and complex behaviours. Observations from several instruments are used to achieve an optimal temporal coverage from radio to TeV energies. In particular, four multi-hour NuSTAR observations organised simultaneously with MAGIC allow to obtain a precise measurement of the falling segments of the two spectral components. A detailed investigation of the very-high-energy (VHE; > 100 GeV) versus X-ray flux correlation is performed, by binning the data into several sub-energy bands. A positively correlated variability is observed, but the correlation characteristics change substantially across the various bands probed. Furthermore, during the simultaneous MAGIC and NuSTAR observations a clear change of the Compton dominance is detected without a simultaneous change in the synchrotron regime, indicating "orphan gamma-ray activity". We also investigate an intriguing bright flare at VHE without a substantial flux increase in the X-rays. Within a leptonic scenario, this behaviour is best explained by the appearance of a second population of highly-energetic electrons spanning a narrow range of energies. Finally, our multi-wavelength correlation study also reveals an anti-correlation between the UV/optical and X-ray bands at a significance level above 3σ.

M3 - Conference article

AN - SCOPUS:85145439093

SN - 1824-8039

VL - 395

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 834

T2 - 37th International Cosmic Ray Conference, ICRC 2021

Y2 - 12 July 2021 through 23 July 2021

ER -

Unveiling the complex correlation patterns in Mrk 421

Résumé

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