A Northern Sky Survey for Steady Tera–Electron Volt Gamma‐Ray Point Sources Using the Tibet Air Shower Array

Amenomori, M.; Ayabe, S.; Chen, D.; Cui, S. W.; Danzengluobu,; Ding, L. K.; Ding, X. H.; Feng, C.; Feng, Z. Y.; Gao, X. Y.; Geng, Q. X.; Guo, H. W.; He, H. H.; He, M.; Hibino, K.; Hotta, N.; Hu, Haibing; Hu, Hongbo; Huang, J.; Huang, Q.; Jia, H. Y.; Kajino, F.; Kasahara, K.; Katayose, Y.; Kato, C.; Kawata, K.; Labaciren,; Le, G. M.; Li, J. Y.; Lü, H.; Lu, S. L.; Meng, X. R.; Mizutani, K.; Mu, J.; Munakata, K.; Nagai, A.; Nanjo, H.; Nakamura, Masaki; Ohnishi, M.; Ohta, I.; Onuma, H.; Ouchi, T.; Ozawa, S.; Ren, J. R.; Saito, T.; Sakata, M.; Sasaki, Takashi; Shibata, M.; Shiomi, A.; Shirai, T.; Sugimoto, H.; Takashima, M.; Takita, M.; Tan, Y. H.; Tateyama, N.; Torii, Shoji; Tsuchiya, H.; Udo, S.; Utsugi, Toshihiro; Wang, H.; Wang, X.; Wang, Y. G.; Wu, H. R.; Xue, L.; Yamamoto, Y.; Yan, C. T.; Yang, X. C.; Yasue, S.; Ye, Z. H.; Yu, G. C.; Yuan, A. F.; Yuda, T.; Zhang, H. M.; Zhang, J. L.; Zhang, N. J.; Zhang, X. Y.; Zhang, Yi; Zhang, Y.; Zhaxisangzhu,; Zhou, X. X.

doi:10.1086/491612

Cited by 71 publications

(36 citation statements)

References 24 publications

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“…Surveys of large regions of the VHE γ-ray sky with the existing Cherenkov telescopes are difficult because of the too-narrow size of the field of view. The wide field-ofview ground-based γ-ray detectors MILAGRO (Atkins et al 2004) and Tibet (Amenomori et al 2005) arrays have produced a systematic survey of the VHE γ-ray sky. The energy threshold of the air shower arrays such as MILAGRO and Tibet is rather high (in the multi-TeV band) so that only sources with spectra extending well above 1 TeV could be detected.…”

Section: Introductionmentioning

confidence: 99%

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

Neronov¹,

Semikoz²,

Vovk³

2011

A&A

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Aims. We present a catalog of sources of very high energy (E > 100 GeV) γ-rays detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope at Galactic latitudes |b| ≥ 10 • . Methods. We cross-correlate the directions of individual photons with energies above 100 GeV detected by Fermi /LAT with the first year Fermi catalog of sources detected at lower energies. We find a significant correlation between the arrival directions of the highest energy photons and positions of Fermi sources, with the possibility of chance coincidences at the level of 10 −45 . We present a list of Fermi sources contributing to the correlation signal. A similar analysis is performed to cross-correlate the catalog of BL Lac objects with the highest energy photons detected by Fermi. Results. We produce a catalog of high Galactic latitude Fermi sources visible at 100−300 GeV energies. The catalog is divided into two parts. The first part contains a list of 50 higher significance sources among which there can be three possible false detections. The second part of the catalog contains a list of 25 lower significance sources, among which six are possibly false detections. Finally we identify eight additional sources from the cross-correlation analysis with the BL Lac catalog. The reported sources of E > 100 GeV γ-rays span a broad range of redshifts, up to z ∼ 1. Most of the sources are BL Lac type objects. Only 17 out of 83 objects in our list were previously reported as VHE γ-ray sources.

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Section: Introductionmentioning

confidence: 99%

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

Neronov¹,

Semikoz²,

Vovk³

2011

A&A

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“…A previous survey of the northern hemisphere using the Cherenkov telescope Whipple has resulted only in derivation of upper limits on the flux of persistent VHE γ-ray sources (Weekes et al 1979). The wide field of view MILAGRO (Atkins et al 2004) and Tibet (Amenomori et al 2005) arrays have produced a systematic survey of the VHE γ-ray sky. However, the energy threshold of the air shower arrays like MILAGRO and TIBET is rather high (in the multi-TeV band) so that only sources with spectra extending well above 1 TeV could be detected.…”

Section: Introductionmentioning

confidence: 99%

Very high-energyγ-ray emission from IC 310

Neronov¹,

Semikoz

Vovk³

2010

A&A

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Context. We search for persistent extragalactic sources of γ-rays with energies above 100 GeV with the Fermi telescope. Aims. We construct a systematic survey of the extragalactic γ-ray sky at energies above 100 GeV. Such a survey has not been done before by the ground-based Cherenkov γ-ray telescopes, which have, contrary to Fermi, a narrow field of view. Methods. We study a map of arrival directions of the highest energy photons detected by Fermi at Galactic latitudes |b| > 10 • and search for significant point-source-like excesses above the diffuse Galactic and extragalactic γ-ray backgrounds. We identify eight significant point-source-like excesses in this map. Results. Seven of the eight sources are known TeV blazars. The previously unknown source is identified with the galaxy IC 310, which is situated in Perseus cluster of galaxies. The source is detected with a significance 6σ above 30 GeV. We identify two possible scenarii for γ-ray emission from this source. One possibility is that emission originates from the base of relativistic outflow from the active nucleus, as in the BL Lacs and FR I type radio galaxies. Otherwise γ-ray photons could be produced at the bow shock that is formed as a result of the fast motion of the galaxy through the intracluster medium. The two models could be distinguished through studying of the γ-ray signal variability.

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“…No statistically significant point source is found except for well established Crab and Mrk421 [12].…”

Section: Pos(icrc2017)831mentioning

confidence: 82%

The Tibet AS+MD Project; status report 2017

Takita¹,

Amenomori²,

Bi³

et al. 2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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We built a large (approximately 4,000 m 2 ) water Cherenkov-type muon detector array under the existing Tibet air shower array at 4,300 m above sea level, to observe 10-1000 TeV gamma rays from cosmic-ray accelerators in our Galaxy with wide field of view at very low background level. A gamma-ray induced air shower has significantly less muons compared with a cosmic-ray induced one. Therefore, we can effectively discriminate between primary gamma rays and cosmicray background events by means of counting number of muons in an air shower event by the muon detector array. We make a status report on the experiment.

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A Northern Sky Survey for Steady Tera–Electron Volt Gamma‐Ray Point Sources Using the Tibet Air Shower Array

Cited by 71 publications

References 24 publications

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

High Galactic latitudeFermisources ofγ-rays with energies above 100 GeV

Very high-energyγ-ray emission from IC 310

The Tibet AS+MD Project; status report 2017

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