Details

Autor(en) / Beteiligte

• ALEKSIC, J
• ALVAREZ, E. A
• BERDYUGIN, A
• BERGER, K
• BERNARDINI, E
• BILAND, A
• BLANCH, O
• BOCK, R. K
• BOLLER, A
• BONNOLI, G
• BORLA TRIDONI, D
• BRAUN, I
• ANTONELLI, L. A
• BRETZ, T
• CANELLAS, A
• CARMONA, E
• CAROSI, A
• COLIN, P
• COLOMBO, E
• CONTRERAS, J. L
• CORTINA, J
• COSSIO, L
• COVINO, S
• ANTORANZ, P
• DAZZI, F
• DE ANGELIS, A
• DE CANEVA, G
• DE CEA DEL POZO, E
• DE LOTTO, B
• DELGADO MENDEZ, C
• DIAGO ORTEGA, A
• DOERT, M
• DOMINGUEZ, A
• DOMINIS PRESTER, D
• ASENSIO, M
• DORNER, D
• DORO, M
• ELSAESSER, D
• FERENC, D
• FONSECA, M. V
• FONT, L
• FRUCK, C
• GARCIA LOPEZ, R. J
• GARCZARCZYK, M
• GARRIDO, D
• BACKES, M
• GIAVITTO, G
• GODINOVIC, N
• HADASCH, D
• HÄFNER, D
• HERRERO, A
• HILDEBRAND, D
• HÖHNE-MÖNCH, D
• HOSE, J
• HRUPEC, D
• HUBER, B
• BARRIO, J. A
• BASTIERI, D
• BECERRA GONZALEZ, J
• BEDNAREK, W

Titel

PG 1553+113: FIVE YEARS OF OBSERVATIONS WITH MAGIC

Ist Teil von

• The Astrophysical journal, 2012-03, Vol.748 (1), p.1-10

Ort / Verlag

Bristol: IOP

Erscheinungsjahr

2012

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We present the results of five years (2005-2009) of MAGIC observations of the BL Lac object PG 1553+113 at very high energies (VHEs; E > 100 GeV). Power-law fits of the individual years are compatible with a steady mean photon index [Gamma] = 4.27 + or - 0.14. In the last three years of data, the flux level above 150 GeV shows a clear variability (probability of constant flux < 0.001%). The flux variations are modest, lying in the range from 4% to 11% of the Crab Nebula flux. Simultaneous optical data also show only modest variability that seems to be correlated with VHE gamma-ray variability. We also performed a temporal analysis of (all available) simultaneous Fermi/Large Area Telescope data of PG 1553+113 above 1 GeV, which reveals hints of variability in the 2008-2009 sample. Finally, we present a combination of the mean spectrum measured at VHEs with archival data available for other wavelengths. The mean spectral energy distribution can be modeled with a one-zone synchrotron self-Compton model, which gives the main physical parameters governing the VHE emission in the blazar jet.