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Search for Emission of Ultra--High-Energy Radiation from Active Galactic Nuclei

1993; IOP Publishing; Volume: 418; Linguagem: Inglês

10.1086/173439

1538-4357

D. E. Alexandreas, G. E. Allen, D. Berley, S. D. Biller, R. L. Burman, F. Šforza, C. Y. Chang, M. L. Chen, P. Chumney, D. G. Coyne, C. Dion, G. M. Dion, D. E. Dorfan, R. W. Ellsworth, J. A. Goodman, T. J. Haines, C. M. Hoffman, L. A. Kelley, S. R. Klein, D. E. Nagle, Susanne Schaller, R. W. Schnee, A. Shoup, G. Sinnis, M. J. Stark, D. D. Weeks, D. A. Williams, Jingwen Wu, T. Yang, G. B. Yodh, W. Zhang,

Dark Matter and Cosmic Phenomena

view Abstract Citations (18) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Search for Emission of Ultra--High-Energy Radiation from Active Galactic Nuclei Alexandreas, D. E. ; Allen, G. E. ; Berley, D. ; Biller, S. ; Burman, R. L. ; Cavalli-Sforza, M. ; Chang, C. Y. ; Chen, M. L. ; Chumney, P. ; Coyne, D. ; Dion, C. ; Dion, G. M. ; Dorfan, D. ; Ellsworth, R. W. ; Goodman, J. A. ; Haines, T. J. ; Hoffman, C. M. ; Kelley, L. ; Klein, S. ; Nagle, D. E. ; Schaller, S. C. ; Schnee, R. ; Shoup, A. ; Sinnis, C. ; Stark, M. J. ; Weeks, D. D. ; Williams, D. A. ; Wu, J. -P. ; Yang, T. ; Yodh, G. B. ; Zhang, W. Abstract The CYGNUS air-shower array has been used to search for emission of ultra-high-energy gamma radiation from 13 active galactic nuclei (AGNs) that were detected by EGRET. The data set spans the period 1986 April 2 to 1993 January 1. The data set has been searched for continuous emission, for emission on the time scale of 1 week, and for emission on the time scale of 1 day. No evidence for emission from any of the AGNs on any of the time scales examined was found. The 90% Confidence Level (CL) upper limit to the continuous flux from Mrk 421 above 50 TeV is 7.5 × 10-14 cm-2 s-1. Publication: The Astrophysical Journal Pub Date: December 1993 DOI: 10.1086/173439 Bibcode: 1993ApJ...418..832A Keywords: GALAXIES: ACTIVE; GALAXIES: BL LACERTAE OBJECTS: GENERAL; GAMMA RAYS: OBSERVATIONS full text sources ADS | data products NED (13) SIMBAD (9)