Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009

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Researchers

  • M. L. Ahnen
  • S. Ansoldi
  • L. A. Antonelli
  • P. Antoranz
  • A. Babic
  • B. Banerjee
  • P. Bangale
  • U. Barres de Almeida
  • J. A. Barrio
  • J. Becerra González
  • W. Bednarek
  • E. Bernardini
  • A. Berti
  • B. Biasuzzi
  • A. Biland
  • O. Blanch
  • S. Bonnefoy
  • G. Bonnoli
  • F. Borracci
  • T. Bretz
  • S. Buson
  • A. Carosi
  • A. Chatterjee
  • R. Clavero
  • P. Colin
  • E. Colombo
  • J. L. Contreras
  • J. Cortina
  • S. Covino
  • P. Da Vela
  • F. Dazzi
  • A. De Angelis
  • B. De Lotto
  • E. Oña-Wilhelmi
  • F. Di Pierro
  • M. Doert
  • A. Domínguez
  • D. Dominis Prester
  • D. Dorner
  • M. Doro
  • S. Einecke
  • D. Eisenacher Glawion
  • D. Elsaesser
  • M. Engelkemeier
  • V. Fallah Ramazani
  • A. Fernández-Barral
  • D. Fidalgo
  • M. V. Fonseca
  • L. Font
  • K. Frantzen
  • C. Fruck
  • D. Galindo
  • R.J. García López
  • M. Garczarczyk
  • D. Garrido Terrats
  • M. Gaug
  • P. Giammaria
  • N. Godinović
  • A. González Muñoz
  • D. Gora
  • D. Guberman
  • D. Hadasch
  • A. Hahn
  • Y. Hanabata
  • M. Hayashida
  • J. Herrera
  • J. Hose
  • D. Hrupec
  • G. Hughes
  • W. Idec
  • K. Kodani
  • Y. Konno
  • H. Kubo
  • J. Kushida
  • A. La Barbera
  • D. Lelas
  • E. Lindfors
  • S. Lombardi
  • F. Longo
  • M. López
  • R. López-Coto
  • P. Majumdar
  • M. Makariev
  • K. Mallot
  • G. Maneva
  • M. Manganaro
  • K. Mannheim
  • L. Maraschi
  • B. Marcote
  • M. Mariotti
  • M. Martínez
  • D. Mazin
  • U. Menzel
  • J. M. Miranda
  • R. Mirzoyan
  • A. Moralejo
  • E. Moretti
  • D. Nakajima
  • V. Neustroev
  • A. Niedzwiecki
  • M. Nievas Rosillo
  • K. Nilsson
  • K. Nishijima
  • K. Noda
  • L. Nogués
  • A. Overkemping
  • S. Paiano
  • J. Palacio
  • M. Palatiello
  • D. Paneque
  • R. Paoletti
  • J. M. Paredes
  • X. Paredes-Fortuny
  • G. Pedaletti
  • M. Peresano
  • L. Perri
  • M. Persic
  • J. Poutanen
  • P.G. Prada Moroni
  • E. Prandini
  • I. Puljak
  • I. Reichardt
  • W. Rhode
  • M. Ribó
  • J. Rico
  • J. Rodriguez Garcia
  • T. Saito
  • K. Satalecka
  • S. Schröder
  • C. Schultz
  • T. Schweizer
  • S. N. Shore
  • A. Sillanpää
  • J. Sitarek
  • I. Snidaric
  • D. Sobczynska
  • A. Stamerra
  • T. Steinbring
  • M. Strzys
  • T. Surić
  • L. Takalo
  • F. Tavecchio
  • P. Temnikov
  • T. Terzić
  • D. Tescaro
  • M. Teshima
  • J. Thaele
  • D. F. Torres
  • T. Toyama
  • A. Treves
  • G. Vanzo
  • V. Verguilov
  • I. Vovk
  • Eric J Ward
  • M. Will
  • M. H. Wu
  • R. Zanin
  • A.U. Abeysekara
  • S. Archambault
  • A. Archer
  • W. Benbow
  • R. Bird
  • M. Buchovecky
  • J.H. Buckley
  • V. Bugaev
  • M.P. Connolly
  • W. Cui
  • H. J. Dickinson
  • A. Falcone
  • Q. Feng
  • J.P. Finley
  • H. Fleischhack
  • A. Flinders
  • L. Fortson
  • G.H. Gillanders
  • S. Griffin
  • J. Grube
  • M. Hütten
  • D. Hanna
  • J. Holder
  • T.B. Humensky
  • P. Kaaret
  • P. Kar
  • N. Kelley-Hoskins
  • M. Kertzman
  • D. Kieda
  • M. Krause
  • F. Krennrich
  • M.J. Lang
  • G. Maier
  • A. McCann
  • P. Moriarty
  • R. Mukherjee
  • D. Nieto
  • S. O'Brien
  • R.A. Ong
  • N. Otte
  • N. Park
  • J. Perkins
  • A. Pichel
  • M. Pohl
  • A. Popkow
  • E. Pueschel
  • J. Quinn
  • K. Ragan
  • P.T. Reynolds
  • G. T. Richards
  • E. Roache
  • A.C. Rovero
  • C. Rulten
  • I. Sadeh
  • M. Santander
  • G.H. Sembroski
  • K. Shahinyan
  • I. Telezhinsky
  • J. V. Tucci
  • J. Tyler
  • S.P. Wakely
  • A. Weinstein
  • P. Wilcox
  • A. Wilhelm
  • D.A. Williams
  • B. Zitzer
  • S. Razzaque
  • M. Villata
  • C.M. Raiteri
  • H. D. Aller
  • M. F. Aller
  • V. M. Larionov
  • A. Arkharov
  • Dmitry A. Blinov
  • Natalia V. Efimova
  • T. S. Grishina
  • Vladimir A. Hagen-Thorn
  • Evgenia N. Kopatskaya
  • Liudmila V. Larionova
  • Elena G. Larionova
  • Daria A. Morozova
  • Ivan S. Troitsky
  • R. Ligustri
  • P. Calcidese
  • A. Berdyugin
  • O. M. Kurtanidze
  • M. G. Nikolashvili
  • Givi N. Kimeridze
  • Lorand A. Sigua
  • Sofia O. Kurtanidze
  • Revaz A. Chigladze
  • W. P. Chen
  • E. Koptelova
  • T. Sakamoto
  • A. C. Sadun
  • J. W. Moody
  • C. Pace
  • R. Pearson
  • Y. Yatsu
  • Y. Mori
  • A. Carraminyana
  • L. Carrasco
  • E. de la Fuente
  • J. P. Norris
  • Paul S. Smith
  • A. Wehrle
  • M. A. Gurwell
  • A. Zook
  • C. Pagani
  • M. Perri
  • M. Capalbi
  • A. Cesarini
  • H. A. Krimm
  • Y. Y. Kovalev
  • Yu A. Kovalev
  • E. Ros
  • Alexander B. Pushkarev
  • M. L. Lister
  • K.V. Sokolovsky
  • M. Kadler
  • B. G. Piner
  • E. Angelakis
  • T. P. Krichbaum
  • I. Nestoras
  • L. Fuhrmann
  • J. A. Zensus
  • P. Cassaro
  • A. Orlati
  • G. Maccaferri
  • P. Leto
  • M. Giroletti
  • J. L. Richards
  • W. Max-Moerbeck
  • A.C.S. Readhead

Research units

  • University of Udine
  • University of Siena
  • University of Rijeka
  • Saha Institute of Nuclear Physics
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • Brazilian Center for Research in Physics
  • Complutense University
  • University of La Laguna
  • NASA Goddard Space Flight Center
  • German Electron Synchrotron
  • Humboldt University of Berlin
  • University of Trieste
  • Autonomous University of Barcelona
  • University of Würzburg
  • Swiss Federal Institute of Technology Lausanne
  • University of Padova
  • Institute of Space Studies of Catalonia
  • Dortmund University
  • University of Barcelona
  • University of Tokyo
  • Finnish MAGIC Consortium
  • Max Planck Institute for Nuclear Physics
  • Bulgarian Academy of Sciences
  • University of Bologna
  • University of Pisa
  • University of Geneva
  • ICREA
  • University of Maryland
  • University of Utah
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  • Washington University St. Louis
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  • Iowa State University
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  • Adler Planetarium and Astronomy Museum
  • University of Delaware
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  • Georgia Institute of Technology
  • University of Chicago
  • Universidad de Buenos Aires
  • University of Potsdam
  • Cork Institute of Technology
  • University of California at Santa Cruz
  • Argonne National Laboratory
  • University of Johannesburg
  • University of Michigan, Ann Arbor
  • St. Petersburg State University
  • RAS - Pulkovo Astronomical Observatory
  • University of Crete
  • Foundation for Research and Technology-Hellas
  • Circolo Astrofili Talmassons
  • Osservatorio Astrofisico della Regione Autonoma Valle d'Aosta
  • Georgian National Academy of Sciences
  • Kazan Volga Region Federal University
  • National Central University
  • Aoyama Gakuin University
  • University of Colorado Denver
  • Brigham Young University
  • Tokyo Institute of Technology
  • Instituto Nacional de Astrofisica Optica y Electronica
  • Universidad de Guadalajara
  • University of Denver
  • University of Arizona
  • Space Science Institute
  • Pomona College
  • University of Leicester
  • ASI Science Data Center
  • University of Trento
  • Universities Space Research Association
  • RAS - P.N. Lebedev Physics Institute
  • Max Planck Institute for Radio Astronomy
  • University of Valencia
  • Lomonosov Moscow State University
  • National Observatory of Athens
  • Whittier College
  • INAF Istituto di Radioastronomia
  • Osservatorio Astrofisico di Catania
  • California Institute of Technology
  • INAF National Institute for Astrophysics
  • University of Lódz
  • Finnish Centre for Astronomy with ESO, University of Turku
  • DePauw University
  • Center for Research and Exploration in Space Science and Technology
  • Crimean Astrophysical Observatory
  • Swiss Federal Institute of Technology Zurich
  • Osservatorio Astronomicodi Roma

Abstract

Context. We present an extensive study of the BL Lac object Mrk 501 based on a data set collected during the multi-instrument campaign spanning from 2009 March 15 to 2009 August 1, which includes, among other instruments, MAGIC, VERITAS, Whipple 10 m, and Fermi-LAT to cover the γ-ray range from 0.1 GeV to 20 TeV; RXTE and Swift to cover wavelengths from UV tohard X-rays; and GASP-WEBT, which provides coverage of radio and optical wavelengths. Optical polarization measurements were provided for a fraction of the campaign by the Steward and St. Petersburg observatories. We evaluate the variability of the source and interband correlations, the γ-ray flaring activity occurring in May 2009, and interpret the results within two synchrotron self-Compton (SSC) scenarios. Aims. The multiband variability observed during the full campaign is addressed in terms of the fractional variability, and the possible correlations are studied by calculating the discrete correlation function for each pair of energy bands where the significance was evaluated with dedicated Monte Carlo simulations. The space of SSC model parameters is probed following a dedicated grid-scan strategy, allowing for a wide range of models to be tested and offering a study of the degeneracy of model-to-data agreement in the individual model parameters, hence providing a less biased interpretation than the "single-curve SSC model adjustment" typically reported in the literature. Methods. We find an increase in the fractional variability with energy, while no significant interband correlations of flux changes are found on the basis of the acquired data set. The SSC model grid-scan shows that the flaring activity around May 22 cannot be modeled adequately with a one-zone SSC scenario (using an electron energy distribution with two breaks), while it can be suitably described within a two (independent) zone SSC scenario. Here, one zone is responsible for the quiescent emission from the averaged 4.5-month observing period, while the other one, which is spatially separated from the first, dominates the flaring emission occurring at X-rays and very-high-energy (>100 GeV, VHE) γ rays. The flaring activity from May 1, which coincides with a rotation of the electric vector polarization angle (EVPA), cannot be satisfactorily reproduced by either a one-zone or a two-independent-zone SSC model, yet this is partially affected by the lack of strictly simultaneous observations and the presence of large flux changes on sub-hour timescales (detected at VHE γ rays). Results. The higher variability in the VHE emission and lack of correlation with the X-ray emission indicate that, at least during the 4.5-month observing campaign in 2009, the highest energy (and most variable) electrons that are responsible for the VHE γ rays do not make a dominant contribution to the ~1 keV emission. Alternatively, there could be a very variable component contributing to the VHE γ-ray emission in addition to that coming from the SSC scenario. The studies with our dedicated SSC grid-scan show that there is some degeneracy in both the one-zone and the two-zone SSC scenarios probed, with several combinations of model parameters yielding a similar model-to-data agreement, and some parameters better constrained than others. The observed γ-ray flaring activity, with the EVPA rotation coincident with the first γ-ray flare, resembles those reported previously for low frequency peaked blazars, hence suggesting that there are many similarities in the flaring mechanisms of blazars with different jet properties.

Details

Original languageEnglish
Article numberA31
Number of pages30
JournalAstronomy and Astrophysics
Volume603
Publication statusPublished - 1 Jul 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • BL Lacertae objects: individual: Markarian 501, Methods: data analysis

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