The MAGIC telescope observed the region around the distant blazar 3C 66A for 54.2 hr in 2007 August-December. The observations resulted in the discovery of a gamma-ray source centered at celestial coordinates R.A. = 2(h)23(m)12(s) and decl.=43 degrees 0'.7 (MAGIC J0223+430), coinciding with the nearby radio galaxy 3C 66B. A possible association of the excess with the blazar 3C 66A is discussed. The energy spectrum of MAGIC J0223+430 follows a power law with a normalization of (1.7 +/- 0.3(stat) +/- 0.6(syst)) x 10(-11) TeV-1 cm(-2) s(-1) at 300 GeV and a photon index Gamma = -3.10 +/- 0.31(stat) +/- 0.2(syst).

Discovery Of A Very High Energy Gamma-Ray Signal From The 3c 66a/B Region / E., A., H., A., L. A., A., P., A., M., B., C., B., S., B., J. A., B., H., B., D., B., J. B., G., J. K., B., W., B., K., B., E., B., A., B., R. K., B., G., B., P., B., D. B., T., et al.. - In: THE ASTROPHYSICAL JOURNAL LETTERS. - ISSN 2041-8205. - STAMPA. - 692:(2009), pp. L29-L33. [10.1088/0004-637X/692/1/L29]

Discovery Of A Very High Energy Gamma-Ray Signal From The 3c 66a/B Region

LONGO, FRANCESCO;
2009-01-01

Abstract

The MAGIC telescope observed the region around the distant blazar 3C 66A for 54.2 hr in 2007 August-December. The observations resulted in the discovery of a gamma-ray source centered at celestial coordinates R.A. = 2(h)23(m)12(s) and decl.=43 degrees 0'.7 (MAGIC J0223+430), coinciding with the nearby radio galaxy 3C 66B. A possible association of the excess with the blazar 3C 66A is discussed. The energy spectrum of MAGIC J0223+430 follows a power law with a normalization of (1.7 +/- 0.3(stat) +/- 0.6(syst)) x 10(-11) TeV-1 cm(-2) s(-1) at 300 GeV and a photon index Gamma = -3.10 +/- 0.31(stat) +/- 0.2(syst).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2338283
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