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Josefa Becerra González ETH Zürich NASA GSFC Instituto de Astrofísica de Canarias
• VHE Gamma-ray astronomy • Blazars • Flare hunting • Gamma-ray Burst (GRBs) • Extragalactic background light (EBL) • Population studies • Optical spectroscopy
Keywords:
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• BL Lac object discovered by H.E.S.S/MAGIC in 2006
• Unknown redshift (z>0.4 Danforth et al. 2010) • Probably located in a galaxy cluster • Have been observed by MAGIC since 2006 • March 2012 detected in high state in VHE gamma-
rays (15% Crab Nebula flux E>150 GeV), Atel 3977
• April 2012 flare detected in VHE regime (~20% Crab Nebula flux E>150 GeV), Atel 4069
• Most extensive multi-wavelength campaign
Probing the models with the blazar PG1553+113
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Cre
dits
: Mar
tin R
aue
4
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Dominguez et. al. 2011
E<10TeV E>10TeV
CTA
• Attenuation effect important for E>100 GeV (λmax[µm]=1.24 Eγ[TeV]) • Effect depends strongly on redshift and energy • Distortion effect on the spectra
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VHE spectrum during flare April 2012
Preliminary
Energy, E [GeV]70 80 90 100 200 300 400 500 600 700
]-1
s-2
cm
-1 [
TeV
dE
dA
dt
dN
-1110
-1010
-910
-810
Preliminary
Observed spectrum not compatible with simple power-law
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Thanks!