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Gamma-ray Flares from the Gravitationally Lensed Blazar B0218+357

Aug 5, 2015, 3:45 PM
World Forum

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution GA-EX Parallel GA19 Fermi


Dr Sara Buson (University of Padova)


The double-image gravitationally lensed blazar B0218+357 displayed several intervals of enhanced activity at gamma-rays. Fermi LAT observations focussed on the 2012 flaring interval led to the measurement at >100 MeV energies of a delay between the two lensed images of 11.46 ± 0.16 days. The delay is about 1 day longer than previously measured at radio wavelengths. Renewed flaring activity has been detected recently in 2014 when the source displayed an exceptionally hard spectrum, significantly different from the 2012 interval, and a different behaviour between the images. We present new Fermi LAT variability and spectral studies of the system and discuss them in the context of previous measurements.
Collaboration FERMI
Registration number following "ICRC2015-I/" 944

Primary author

Dr Sara Buson (University of Padova)


Dr C.C. Cheung (Naval Research Laboratory) Dr J. Finke (Naval Research Laboratory) Dr J. Scargle (NASA Ames Research Center) Dr S. Larsson (Stockholm University)

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