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Mrk 421 active state in 2008: the MAGIC view, simultaneous multi-wavelength observations and SSC model constrained | | J. Aleksic
; E. A. Alvarez
; L. A. Antonelli
; P. Antoranz
; M. Asensio
; M. Backes
; J. A. Barrio
; D. Bastieri
; J. Becerra Gonzalez
; W. Bednarek
; A. Berdyugin
; K. Berger
; E. Bernardini
; A. Biland
; O. Blanch
; R. K. Bock
; A. Boller
; G. Bonnoli
; D. Borla Tridon
; I. Braun
; T. Bretz
; A. Canellas
; E. Carmona
; A. Carosi
; P. Colin
; E. Colombo
; J. L. Contreras
; J. Cortina
; L. Cossio
; S. Covino
; F. Dazzi
; A. De Angelis
; G. De Caneva
; E. De Cea del Pozo
; B. De Lotto
; C. Delgado Mendez
; A. Diago Ortega
; M. Doert
; A. Dominguez1
; D. Dominis Prester
; D. Dorner
; M. Doro
; D. Elsaesser
; D. Ferenc
; M. V. Fonseca
; L. Font
; C. Fruck
; R. J. Garcia Lopez
; M. Garczarczyk
; D. Garrido
; G. Giavitto
; N. Godinovic
; D. Hadasch
; D. Häfner
; A. Herrero
; D. Hildebrand
; D. Höhne-Mönch
; J. Hose
; D. Hrupec
; B. Huber
; T. Jogler
; H. Kellermann
; S. Klepser
; T. Krahenbuh
; J. Krause
; A. La Barbera
; D. Lelas
; E. Leonardo
; E. Lindfors
; S. Lombardi
; A. Lopez
; M. Lopez
; E. Lorenz
; M. Makariev
; G. Maneva
; N. Mankuzhiyil
; K. Mannheim
; L. Maraschi
; M. Mariotti
; M. Martinez
; D. Mazin
; M. Meucci
; J. M. Miranda
; R. Mirzoyan
; H. Miyamoto
; J. Moldon
; A. Moralejo
; P. Munar-Adrover
; D. Nieto
; K. Nilsson
; R. Orito
; I. Oya
; D. Paneque
; R. Paoletti
; S. Pardo
; J. M. Paredes
; S. Partini
; M. Pasanen
; F. Pauss
; M. A. Perez-Torres
; M. Persic
; L. Peruzzo
; M. Pilia
; J. Pochon
; F. Prada
; P. G. Prada Moroni
; E. Prandini
; I. Puljak
; I. Reichardt
; R. Reinthal
; W. Rhode
; M. Ribo
; J. Rico
; S. Rügamer
; A. Saggion
; K. Saito
; T. Y. Saito
; M. Salvati
; K. Satalecka
; V. Scalzotto
; V. Scapin
; C. Schultz
; T. Schweizer
; M. Shayduk
; S. N. Shore
; A. Sillanpaa
; J. Sitarek
; D. Sobczynska
; F. Spanier
; S. Spiro
; A. Stamerra
; B. Steinke
; J. Storz
; N. Strah
; T. Suric
; L. Takalo
; H. Takami
; F. Tavecchio
; P. Temnikov
; T. Terzic
; D. Tescaro
; M. Teshima
; O. Tibolla
; D. F. Torres
; A. Treves
; M. Uellenbeck
; H. Vankov
; P. Vogler
; R. M. Wagner
; Q. Weitzel
; V. Zabalza
; F. Zandanel
; R. Zanin
; | | Date: |
8 Jun 2011 | | Abstract: | Context. The HBL-type blazar Markarian 421 is one of the brightest TeV
gamma-ray sources of the northern sky. From December 2007 until June 2008 it
was intensively observed in the VHE (E > 100 GeV) band by the single dish Major
Atmospheric Gamma-ray Imaging Cherenkov telescope (MAGIC-I). Aims. We aimed to
sample the evolution of the source emission at VHE and in other bands, and to
model the broad band spectral energy distribution (SED) of selected states,
reconstructed by means of sets of multi-wavelength (MWL) data observed
simultaneously. Methods. We performed a dense monitoring of the source in VHE
with MAGIC-I, collecting also complementary data in soft X-rays and optical-UV
bands; then, we modeled the SEDs derived from simultaneous MWL data within the
Synchrotron Self-Compton (SSC) framework.
Results. The source showed intense and prolonged gamma-ray activity during
the whole period, with integral fluxes (E > 200 GeV) sel- dom below the level
of Crab Nebula, and up to 3.6 times this value. Eight datasets of simultaneous
optical-UV (KVA, Swift/UVOT), soft X-ray (Swift/XRT) and MAGIC-I VHE data were
obtained during different outburst phases. Robust constraints could be put to
the physical parameters of the jet, interpreting the spectral energy
distributions obtained within the framework of a single-zone SSC leptonic
model.
Conclusions. The main outcome of the study is that within the homogeneous
model high Doppler factors (40 leq {delta} leq 80) are needed to reproduce
the observed SED; but this model can not explain the observed short time scale
variability, while it can be argued that inho- mogeneous models could allow for
less extreme Doppler factors, larger magnetic fields and shorter electron
cooling times compatible with hour or sub-hour scale variability. | | Source: | arXiv, 1106.1589 | | Services: | Forum | Review | PDF | Favorites | |
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