Discovery of VHE gamma-ray emission from the BL Lac object B3 2247+381 with the MAGIC telescopes

Abstract

We study the non-thermal jet emission of the BL Lac object B3 2247+381 during a high optical state. The MAGIC telescopes observed the source during 13 nights between September 30th and October 30th 2010, collecting a total of 14.2 hours of good quality very high energy (VHE) $\gamma$-ray data. Simultaneous multiwavelength data was obtained with X-ray observations by the Swift satellite and optical R-band observations at the KVA-telescope. We also use high energy $\gamma$-ray (HE, 0.1 GeV-100 GeV) data from the Fermi satellite. The BL Lac object B3 2247+381 (z=0.119) was detected, for the first time, at VHE $\gamma$-rays at a statistical significance of 5.6 $\sigma$. A soft VHE spectrum with a photon index of -3.2 $\pm$ 0.6 was determined. No significant short term flux variations were found. We model the spectral energy distribution using a one-zone SSC-model, which can successfully describe our data.

7 pages, 6 figures, 1 table, accepted for publication in Astronomy and Astrophysics

References in corpus (9)

• Very-High-Energy Gamma Rays from a Distant Quasar: How Transparent Is the Universe?
• Implementation of the Random Forest Method for the Imaging Atmospheric Cherenkov Telescope MAGIC
• Simultaneous observations of PKS 2155-304 with H.E.S.S., Fermi, RXTE and ATOM: spectral energy distributions and variability in a low state
• Host galaxy subtraction of TeV candidate BL Lacertae objects
• Discovery of Very High Energy gamma-rays from 1ES 1011+496 at z=0.212
• Unfolding of differential energy spectra in the MAGIC experiment
• Discovery of a very high energy gamma-ray signal from the 3C 66A/B region
• X-ray/UV/Optical follow-up of the blazar PKS 2155-304 after the giant TeV flares of July 2006
• Gamma-ray excess from a stacked sample of high- and intermediate-frequency peaked blazars observed with the MAGIC telescope

Cited by in corpus (27)

• The extragalactic background light, the Hubble constant, and anomalies: conclusions from 20 years of TeV gamma-ray observations
• Extragalactic Background Light from Hierarchical Galaxy Formation: Gamma-ray Attenuation up to the Epoch of Cosmic Reionization and the First Stars
• Performance of the MAGIC telescopes under moonlight
• Discovery of VHE gamma-rays from the blazar 1ES 1215+303 with the MAGIC Telescopes and simultaneous multi-wavelength observations
• The physical properties of Fermi BL Lac objects jets
• First-Epoch VLBA Imaging of Twenty New TeV Blazars
• Evidence for a cosmological effect in γ-ray spectra of BL Lacs
• Upper limits from five years of blazar observations with the VERITAS Cherenkov telescopes
• Investigating the peculiar emission from the new VHE gamma-ray source H1722+119
• MAGIC detection of short-term variability of the high-peaked BL Lac object 1ES 0806+524
• Anisotropy test of the axion-like particle Universe opacity effect: a case for the Cherenkov Telescope Array
• X-ray spectral studies of TeV gamma-ray emitting blazars
• Multi-TeV flaring from high energy blazars: An evidence of the photohadronic process
• Optical and Radio variability of the Northern VHE gamma-ray emitting BL Lac objects
• Discovery of very high energy gamma-ray emission from the blazar 1ES 1727+502 with the MAGIC Telescopes
• The physical properties of \textit{Fermi} TeV BL Lac objects jets
• Estimation of the Extragalactic Background Light using TeV Observations of BL~Lacs
• The microvariability and wavelength dependence of polarization degree/angle of BL Lacertae in the outburst 2020 to 2021
• Lower Bound on the Cosmic TeV Gamma-ray Background Radiation
• Model-independent Redshift Estimation of BL Lac Objects through VHE Observations
• Using the Markov Chain Monte Carlo method to study the physical properties GeV-TeV BL Lac objects
• Propagation of very-high-energy $\gamma$-rays from distant blazars
• The `blazar sequence' in TeV band
• GeV-TeV $\gamma$-ray energy spectral break of BL Lac objects
• VERITAS and multiwavelength observations of the Blazar B3 2247+381 in response to an IceCube neutrino alert
• Revisiting the evidences for spectral anomalies in distant blazars: new data on the photon-ALP mixing
• Survey of nearby active galactic nuclei with the HAWC Observatory