Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716493.0, MPI für Physik / YB 2016
Discovery of very high energy gamma-ray emission from the blazar 1ES 0033+595 by the MAGIC telescopes
Authors:
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon.Not.R.Astron.Soc.
Issue / Number:446
Start Page:217
End Page:225
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:The number of known very high energy (VHE) blazars is $\\sim\\,50$, which is very small in comparison to the number of blazars detected in other frequencies. This situation is a handicap for population studies of blazars, which emit about half of their luminosity in the $\\gamma$-ray domain. Moreover, VHE blazars, if distant, allow for the study of the environment that the high-energy $\\gamma$-rays traverse in their path towards the Earth, like the extragalactic background light (EBL) and the intergalactic magnetic field (IGMF), and hence they have a special interest for the astrophysics community. We present the first VHE detection of 1ES\\,0033+595 with a statistical significance of 5.5\\,$\\sigma$. The VHE emission of this object is constant throughout the MAGIC observations (2009 August and October), and can be parameterized with a power law with an integral flux above 150 GeV of $(7.1\\pm1.3)\\times 10^{-12} {\\mathrm{ph\\,cm^{-2}\\,s^{-1}}}$ and a photon index of ($3.8\\pm0.7$). We model its spectral energy distribution (SED) as the result of inverse Compton scattering of synchrotron photons. For the study of the SED we used simultaneous optical R-band data from the KVA telescope, archival X-ray data by \\textit{Swift} as well as \\textit{INTEGRAL}, and simultaneous high energy (HE, $300$\\,MeV~--~$10$\\,GeV) $\\gamma$-ray data from the \\textit{Fermi} LAT observatory. Using the empirical approach of Prandini et al. (2010) and the \\textit{Fermi}-LAT and MAGIC spectra for this object, we estimate the redshift of this source to be $0.34\\pm0.08\\pm0.05$. This is a relevant result because this source is possibly one of the ten most distant VHE blazars known to date, and with further (simultaneous) observations could play an important role in blazar population studies, as well as future constraints on the EBL and IGMF.
Classification / Thesaurus:MAGIC
Comment of the Author/Creator:Accepted to be published in MNRAS, 10 pages, 8 figures
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
Affiliations:
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