13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

The first detection of the blazar S4 0954+65 at very-high energies with the MAGIC Telescopes during an exceptionally high optical state

15 Dec 2015, 17:15
Level 0, Room 4 (International Conference Centre Geneva)

Level 0, Room 4

International Conference Centre Geneva


Giovanna Pedaletti (DESY)


The blazar S4 0954+65 (at a redshift of z=0.368) underwent an exceptionally high state in optical during January and February 2015, as revealed by the Tuorla and St.Petersburg University blazar monitoring programs: a brightening of more than 3 magnitudes in the R-band from the average monitored states. Simultaneous data from the Fermi-LAT satellite at high energy gamma rays (100MeV < E < 100GeV) also show a period of increased activity. MAGIC observations, triggered by these enhanced emissions in lower energy bands, led to the discovery of very high energy (VHE, E>100 GeV) emission from S4 0954+65 (ATel #7080). The VHE flux above 150GeV is estimated to be about 6% of the Crab nebula flux above the same threshold. In this contribution we present a comprehensive multiwavelength picture of this object, including data from mm/optical/X-ray/HE and VHE gamma-ray bands along with analysis of the parsec scale jet behavior.
Collaboration MAGIC

Primary author


Alan Marscher (Institute for Astrophysical Research Boston university) Borman George (Crimean astrophysical observatory) Elina Lindfors (University of Turku) Ivan Troitsky (Astronomical Institute of St.Petersburg University) Josefa Becerra Gonzalez (NASA GSFC) Marina Manganaro (IAC) Marlene Doert (TU Dortmund) Miguel Nievas Rosillo (UCM) Svetlana Jorstad (Institute for Astrophysical Research Boston university) Valeri Larionov (Astronomical Institute of St.Petersburg University) Vandad Fallah Ramazani (University of Turku)

Presentation Materials