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Detection of very-high-energy gamma rays from the most distant and gravitationally lensed blazar S3 0218+35 using the MAGIC telescope system

Aug 1, 2015, 11:00 AM
Yangtze 1 (World Forum)

Yangtze 1

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution GA-EX Parallel GA08 EGAL


Julian Sitarek (University of Łódź)


S3 0218+35 is a blazar located at a cosmological redshift of z=0.944. It is gravitationally lensed by a spiral galaxy at a redshift of z=0.68. The blazar and its lens are well studied in the radio through X-ray bands, and several blazar outbursts were detected by Fermi-LAT at energies above 100 MeV. Strong gravitational lensing was invoked to explain the two components apparent in the radio and GeV light curves, separated by 10-12 days. In July 2014 another outburst was observed by Fermi-LAT, triggering follow-up observations with the MAGIC telescopes at energies above 100 GeV. The observations were scheduled at the expected time of arrival of the component delayed by the strong gravitational field of the lens, resulting in a firm detection of S3 0218+35. Using the combined Fermi-LAT and MAGIC data sets, we report on the spectrum and variability of this unique blazar, the most distant among all currently known VHE sources.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 500

Primary author

Julian Sitarek (University of Łódź)


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