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arxiv: 1708.04047 · v2 · pith:CZVXB6KGnew · submitted 2017-08-14 · 🌌 astro-ph.HE

MAGIC observations of variable very-high-energy gamma-ray emission from PKS1510-089 during May 2015 outburst

Julian Sitarek , Josefa Becerra Gonz\'alez , Vandad Fallah Ramazani Elina Lindfors , Giovanna Pedaletti , Fabrizio Tavecchio , Monica Vazquez Acosta , Stefan Larsson , the MAGIC Collaboration
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The Fermi-LAT Collaboration Kiran Baliyan Navpreet Kaur Sameer Svetlana Jorstad Claudia Raiteri
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classification 🌌 astro-ph.HE
keywords pks1510-089gamma-raymagicdetectedemissiontimevariabilityvariable
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PKS1510-089 is a flat spectrum radio quasar located at a redshift of 0.36. It is one of only a few such sources detected in very-high-energy (VHE, >100 GeV) gamma rays. Though PKS1510-089 is highly variable at GeV energies, until recently no variability has been observed in the VHE band. In 2015 May PKS1510-089 showed a high state in optical and in the GeV range. A VHE gamma-ray flare was detected with MAGIC at that time, showing the first instance of VHE gamma-ray flux variability on the time scale of days in this source. We will present the MAGIC results from this observation, discuss their temporal and spectral properties in the multi-wavelength context and present modelling of such emission in the external Compton scenario.

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