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    Discovery of a new TeV gamma-ray source: Ver J0521+211

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    2013Discovery.pdf (584.7Kb)
    Date
    2013
    Author
    Archambault, S.
    Böttcher, M.
    Arlen, T.
    Aune, T.
    Behera, B.
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    Abstract
    We report the detection of a new TeV gamma-ray source, VER J0521+211, based on observations made with the VERITAS imaging atmospheric Cherenkov Telescope Array. These observations were motivated by the discovery of a cluster of >30 GeV photons in the first year of Fermi Large Area Telescope observations. VER J0521+211 is relatively bright at TeV energies, with a mean photon flux of (1.93  ±  0.13stat  ±  0.78sys) × 10−11 cm−2 s−1 above 0.2 TeV during the period of the VERITAS observations. The source is strongly variable on a daily timescale across all wavebands, from optical to TeV, with a peak flux corresponding to ~0.3 times the steady Crab Nebula flux at TeV energies. Follow-up observations in the optical and X-ray bands classify the newly discovered TeV source as a BL Lac-type blazar with uncertain redshift, although recent measurements suggest z = 0.108. VER J0521+211 exhibits all the defining properties of blazars in radio, optical, X-ray, and gamma-ray wavelengths.
    URI
    http://hdl.handle.net/10394/13656
    https://doi.org/10.1088/0004-637X/776/2/69
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