Abstract
The Whipple Observatory 10 m γ-ray telescope has been used to survey the error boxes of EGRET unidentified sources in an attempt to find counterparts at energies of 350 GeV and above. Twenty-one unidentified sources detected by EGRET (more than 10% of the total number) have been included in this survey. In no case is a statistically significant signal found in the EGRET error box, which implies that, at least for this sample, the γ-ray spectra of these sources steepen between 100 MeV and 350 GeV. For each EGRET source location, we list candidate associations and derive upper limits on the integral γ-ray flux above 350 GeV.
Published in:
Astrophysical Journal 624,2 (2005) 638-655;
Link to original published article:
http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v624n2/61413/61413.html
Keywords
galaxies : jets;; gamma rays : observations;; surveys;; gamma-ray sources;; source 3eg j2227+6122;; x-ray;; galactic plane;; ls i+61-degrees-303;; supernova-remnants;; galaxy clusters;; sax j0635+0533;; tev energies;; error box
Date of Version
January 2005
Recommended Citation
Fegan, S. J.; Badran, H. M.; Bond, I. H.; Boyle, P. J.; Bradbury, S. M.; Buckley, J. H.; Carter-Lewis, D. A.; Catanese, M.; Celik, O.; Cui, W.; Daniel, M.; D'Vali, M.; Perez, I. D. C.; Duke, C.; Falcone, A.; Fegan, D. J.; Finley, J. P.; Fortson, L. F.; Gaidos, J. A.; Gammell, S.; Gibbs, K.; Gillanders, G. H.; Grube, J.; Hall, J.; Hall, T. A.; Hanna, D.; Hillas, A. M.; Holder, J.; Horan, D.; Jarvis, A.; Jordan, M.; Kenny, G. E.; Kertzman, M.; Kieda, D.; Kildea, J.; Knapp, J.; Kosack, K.; Krawczynski, H.; Krennrich, F.; Lang, M. J.; Le Bohec, S.; Lessard, R. W.; Linton, E.; Lloyd-Evans, J.; Milovanovic, A.; McEnery, J.; Moriarty, P.; Mukherjee, R.; Muller, D.; Nagai, T.; Nolan, S.; Ong, R. A.; Pallassini, R.; Petry, D.; Power-Mooney, B.; Quinn, J.; Quinn, M.; Ragan, K.; Rebillot, P.; Reynolds, P. T.; Rose, H. J.; Schroedter, M.; Sembroski, G. H.; Swordy, S. P.; Syson, A.; Vassiliev, V. V.; Wakely, S. P.; Walker, G.; Weekes, T. C.; and Zweerink, J., "A survey of unidentified egret sources at very high energies" (2005). Department of Physics and Astronomy Faculty Publications. Paper 154.
https://docs.lib.purdue.edu/physics_articles/154