DETECTION OF EXTENDED VHE GAMMA RAY EMISSION FROM G106.3+2.7 WITH VERITAS


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Acciari V. A. , Aliu E., Arlen T., Aune T., Bautista M., Beilicke M., ...More

ASTROPHYSICAL JOURNAL LETTERS, vol.703, no.1, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 703 Issue: 1
  • Publication Date: 2009
  • Doi Number: 10.1088/0004-637x/703/1/l6
  • Title of Journal : ASTROPHYSICAL JOURNAL LETTERS
  • Keywords: gamma rays: observations, ISM: individual (G106.3+2.7=VER J2227+608), pulsars: individual (J2229+6114), supernova remnants, PULSAR WIND NEBULAE, SOURCE 3EG J2227+6122, GALACTIC-PLANE SURVEY, SUPERNOVA REMNANT, MOLECULAR CLOUDS, SOURCE LIST, TELESCOPE, DISCOVERY, ASTRONOMY, FIELD

Abstract

We report the detection of very-high-energy (VHE) gamma-ray emission from supernova remnant (SNR) G106.3+2.7. Observations performed in 2008 with the VERITAS atmospheric Cherenkov gamma-ray telescope resolve extended emission overlapping the elongated radio SNR. The 7.3 sigma (pre-trials) detection has a full angular extent of roughly 0 degrees.6 by 0 degrees.4. Most notably, the centroid of the VHE emission is centered near the peak of the coincident (CO)-C-12 (J = 1-0) emission, 0 degrees.4 away from the pulsar PSR J2229+6114, situated at the northern end of the SNR. Evidently the current-epoch particles from the pulsar wind nebula are not participating in the gamma-ray production. The VHE energy spectrum measured with VERITAS is well characterized by a power law dN/dE = N-0(E/3 TeV)(-Gamma) with a differential index of Gamma = 2.29 +/- 0.33(stat) +/- 0.30(sys) and a flux of N-0 = (1.15 +/- 0.27(stat) +/- 0.35(sys)) x 10(-13) cm(-2) s(-1) TeV-1. The integral flux above 1 TeV corresponds to similar to 5 percent of the steady Crab Nebula emission above the same energy. We describe the observations and analysis of the object and briefly discuss the implications of the detection in a multiwavelength context.