PoS - Proceedings of Science
Volume 329 - International Conference on Black Holes as Cosmic Batteries: UHECRs and Multimessenger Astronomy (BHCB2018) - Main session
First detection of the FSRQ TON 0599 in the VHE regime
J. Hirako*, T. Terzic, A. Stamerra, F. Tavecchio, C. Righi, C. Raiteri and L. Pacciani
Full text: pdf
Pre-published on: May 13, 2019
Published on: May 21, 2019
TON 0599 is the seventh flat spectrum radio quasar (FSRQ) detected so far in the very high energy (VHE, E > 100 GeV) regime.
The VHE gamma-ray emission was discovered on December 2017 with the MAGIC telescopes, making TON 0599 the third farthest source (z = 0.72) in the VHE sky.
The MAGIC observation was triggered by a hardening of the high energy (HE, E > 100 MeV) gamma-ray spectrum observed with Fermi-LAT and during one hour, the flux reached 40 per cent of the Crab Nebula flux above 80 GeV. Observations continued for two weeks, with a gradual decrease of the flux.
The simultaneous VHE (MAGIC) and HE (Fermi) gamma-ray spectra connect smoothly. The joint spectrum shows a sudden drop above $\sim$ 8 GeV, which may suggest a strong absorption of the VHE gamma rays within the source, and intra-day spectral variations.
MAGIC data provide a unique opportunity to investigate these variations during a flaring episode and peek into the structure of FSRQs.
We round the multiwavelength picture with observations in optical, IR, and radio bands acquired by the WEBT collaboration during the whole 2017-2018 optical observing season, from November to May.
DOI: https://doi.org/10.22323/1.329.0013
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.