Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/37565
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Type: | Journal article |
Title: | Is the giant radio galaxy M 87 a TeV gamma-ray emitter? |
Author: | Aharonian, F. Akhperjanian, A. Beilicke, M. Bernlohr, K. Borst, H. Bojahr, H. Bolz, O. Coarasa, T. Contreras, J. Contina, J. Denninghoff, S. Fonseca, M. Girma, M. Gotting, N. Heinzelmann, G. Hermann, G. Heusler, A. Hofmann, W. Horns, D. Jung, I. et al. |
Citation: | Astronomy and Astrophysics: a European journal, 2003; 403(1):L1-L5 |
Publisher: | E D P Sciences |
Issue Date: | 2003 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | F. A. Aharonian ...G. P. Rowell...et al. |
Abstract: | For the first time an excess of photons above an energy threshold of 730 GeV from the giant radio galaxy M 87 has been measured at a significance level above 4 σ. The data have been taken during the years 1998 and 1999 with the HEGRA stereoscopic system of 5 imaging atmospheric Cherenkov telescopes. The excess of 107.4 ± 26.8 events above 730 GeV corresponds to an integral flux of 3.3% of the Crab flux or Nγ (E > 730 GeV) = (0.96 ± 0.23) × 10-12 phot cm-2 s-1. M 87 is located at the center of the Virgo cluster of galaxies at a relatively small redshift of z = 0.00436 and is a promising candidate among the class of giant radio galaxies for the emission of TeV γ-radiation. The detection of TeV γ-rays from M 87 - if confirmed - would establish a new class of extragalactic source in this energy regime since all other AGN detected to date at TeV energies are BL Lac type objects. |
Rights: | © The European Southern Observatory 2003 |
DOI: | 10.1051/0004-6361:20030372 |
Published version: | http://dx.doi.org/10.1051/0004-6361:20030372 |
Appears in Collections: | Aurora harvest 6 Physics publications |
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hdl_37565.pdf | Published version | 408.71 kB | Adobe PDF | View/Open |
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