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Title: TeV gamma-ray survey of the northern sky using the ARGO-YBJ detector

The Astrophysical Radiation with Ground-based Observatory at Yang Ba Jing (ARGO-YBJ) detector is an extensive air shower array that has been used to monitor the northern γ-ray sky at energies above 0.3 TeV from 2007 November to 2013 January. In this paper, we present the results of a sky survey in the declination band from –10° to 70°, using data recorded over the past five years. With an integrated sensitivity ranging from 0.24 to ∼1 Crab units depending on the declination, six sources have been detected with a statistical significance greater than five standard deviations. Several excesses are also reported as potential γ-ray emitters. The features of each source are presented and discussed. Additionally, 95% confidence level upper limits of the flux from the investigated sky region are shown. Specific upper limits for 663 GeV γ-ray active galactic nuclei inside the ARGO-YBJ field of view are reported. The effect of the absorption of γ-rays due to the interaction with extragalactic background light is estimated.
Authors:
;  [1] ; ; ;  [2] ; ; ; ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [7] ;  [8] ; ;  [9] ;  [10] ;  [11] ;  [12] more »; ; « less
  1. Dipartimento di Fisica dell'Università di Napoli "Federico II," Complesso Universitario di Monte Sant'Angelo, via Cinthia, I-80126 Napoli (Italy)
  2. Dipartimento Matematica e Fisica "Ennio De Giorgi," Università del Salento, via per Arnesano, I-73100 Lecce (Italy)
  3. Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918, 100049 Beijing (China)
  4. Dipartimento di Fisica dell'Università di Pavia, via Bassi 6, I-27100 Pavia (Italy)
  5. Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, via della Vasca Navale 84, I-00146 Roma (Italy)
  6. Istituto Nazionale di Fisica Nucleare - CNAF, Viale Berti-Pichat 6/2, I-40127 Bologna (Italy)
  7. Dipartimento di Fisica dell'Università di Roma "Tor Vergata," via della Ricerca Scientifica 1, I-00133 Roma (Italy)
  8. Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tor Vergata, via della Ricerca Scientifica 1, I-00133 Roma (Italy)
  9. Tibet University, 850000 Lhasa, Xizang (China)
  10. Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, via per Arnesano, I-73100 Lecce (Italy)
  11. Hebei Normal University, Shijiazhuang 050016, Hebei (China)
  12. Yunnan University, 2 North Cuihu Rd., 650091 Kunming, Yunnan (China)
Publication Date:
OSTI Identifier:
22348540
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; ASTROPHYSICS; EXTENSIVE AIR SHOWERS; GALAXY NUCLEI; GAMMA RADIATION; INTERACTIONS; SENSITIVITY; TEV RANGE; VISIBLE RADIATION