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Title: Discovery of very high energy γ-ray emission from the blazar 1ES 0033+595 by the MAGIC telescopes

Journal Article · · Monthly Notices of the Royal Astronomical Society
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The number of known very high energy (VHE) blazars is ~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 γ-ray domain. Moreover, VHE blazars, if distant, allow for the study of the environment that the high-energy γ-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. In this papaer, we present the first VHE detection of 1ES 0033+595 with a statistical significance of 5.5σ. The VHE emission of this object is constant throughout the MAGIC observations (2009 August and October), and can be parametrized with a power law with an integral flux above 150 GeV of (7.1 ± 1.3) × 10-12 photons cm-2 s-1 and a photon index of (3.8 ± 0.7). 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 Swift as well as INTEGRAL, and simultaneous high-energy (HE, 300 MeV–10 GeV) γ-ray data from the Fermi Large Area Telescope (LAT) observatory. Using the empirical approach of Prandini et al. (2010) and the Fermi LAT and MAGIC spectra for this object, we estimate the redshift of this source to be 0.34 ± 0.08 ± 0.05. Also, this is a relevant result because this source is possibly one of the 10 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Fermi-LAT Collaboration; MAGIC Collaboration
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1356433
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 446, Issue 1; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (4)

Insights into the emission of the blazar 1ES 1011+496 through unprecedented broadband observations during 2011 and 2012 journal June 2016
Empirical multi-wavelength prediction method for very high energy gamma-ray emitting BL Lacertae objects journal December 2017
Long-term optical monitoring of TeV emitting blazars: I. Data analysis⋆ journal December 2018
Insights into the emission of the blazar 1ES 1011+496 through unprecedented broadband observations during 2011 and 2012 text January 2016

Figures / Tables (10)

Figure 1(p. 4)figure Figure 1
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Table 1(p. 5)table Table 1
Figure 5(p. 6)figure Figure 5
Figure 6(p. 6)figure Figure 6
Figure 7(p. 7)figure Figure 7
Figure 8(p. 8)figure Figure 8
Table 2(p. 8)table Table 2

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BL Lacertae objects: individual: (1ES 0033+595)
gamma-rays: galaxies