Bibcode
Acciari, V. A.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; Böttcher, M.; Boltuch, D.; Bradbury, S. M.; Buckley, J. H.; Bugaev, V.; Cannon, A.; Cesarini, A.; Ciupik, L.; Cui, W.; Dickherber, R.; Duke, C.; Errando, M.; Falcone, A.; Finley, J. P.; Finnegan, G.; Fortson, L.; Furniss, A.; Galante, N.; Gall, D.; Godambe, S.; Grube, J.; Guenette, R.; Gyuk, G.; Hanna, D.; Holder, J.; Huang, D.; Hui, C. M.; Humensky, T. B.; Imran, A.; Kaaret, P.; Karlsson, N.; Kertzman, M.; Kieda, D.; Konopelko, A.; Krawczynski, H.; Krennrich, F.; Madhavan, A. S.; Maier, G.; McArthur, S.; McCann, A.; Moriarty, P.; Ong, R. A.; Otte, A. N.; Pandel, D.; Perkins, J. S.; Pichel, A.; Pohl, M.; Quinn, J.; Ragan, K.; Reyes, L. C.; Reynolds, P. T.; Roache, E.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Steele, D.; Swordy, S. P.; Theiling, M.; Thibadeau, S.; Varlotta, A.; Vassiliev, V. V.; Vincent, S.; Wakely, S. P.; Ward, J. E.; Weekes, T. C.; Weinstein, A.; Weisgarber, T.; Williams, D. A.; Wood, M.; Zitzer, B.; VERITAS Collaboration; Aleksić, J.; Antonelli, L. A.; Antoranz, P.; Backes, M.; Barrio, J. A.; Bastieri, D.; Becerra-González, J.; Bednarek, W.; Berdyugin, A.; Berger, K.; Bernardini, E.; Biland, A.; Blanch, O.; Bock, R. K.; Boller, A.; Bonnoli, G.; Bordas, P.; Borla Tridon, D.; Bosch-Ramon, V.; Bose, D.; Braun, I.; Bretz, T.; Camara, M.; Carmona, E. et al.
Bibliographical reference
The Astrophysical Journal, Volume 729, Issue 1, article id. 2 (2011).
Advertised on:
3
2011
Journal
Citations
86
Refereed citations
74
Description
The very high energy (VHE; E > 100 GeV) blazar Markarian 501 (Mrk
501) has a well-studied history of extreme spectral variability and is
an excellent laboratory for studying the physical processes within the
jets of active galactic nuclei. However, there are few detailed
multiwavelength studies of Mrk 501 during its quiescent state, due to
its low luminosity. A short-term multiwavelength study of Mrk 501 was
coordinated in 2009 March, focusing around a multi-day observation with
the Suzaku X-ray satellite and including γ-ray data from VERITAS,
MAGIC, and the Fermi Gamma-ray Space Telescope with the goal of
providing a well-sampled multiwavelength baseline measurement of Mrk 501
in the quiescent state. The results of these quiescent-state
observations are compared to the historically extreme outburst of 1997
April 16, with the goal of examining variability of the spectral energy
distribution (SED) between the two states. The derived broadband SED
shows the characteristic double-peaked profile. We find that the X-ray
peak shifts by over two orders of magnitude in photon energy between the
two flux states while the VHE peak varies little. The limited shift in
the VHE peak can be explained by the transition to the Klein-Nishina
(KN) regime. Synchrotron self-Compton models are matched to the data and
the implied KN effects are explored.