TeV GAMMA-RAY SURVEY OF THE NORTHERN SKY USING THE ARGO-YBJ DETECTOR

Bartoli, B.; Bernardini, P.; Bi, X. J.; Bolognino, I.; Branchini, P.; Budano, A.; Melcarne, A. K. Calabrese; Camarri, P.; Cao, Zhe; Cardarelli, R.; Catalanotti, S.; Chen, Songzhan; Chen, T. L.; Chen, Y.; Creti, P.; Cui, S. W.; Dai, B. Z.; D’Amone, A.; Danzengluobu,; Mitri, I. De; Piazzoli, B. D’Ettorre; Girolamo, T. Di; Ding, X. H.; Sciascio, G. Di; Feng, C.; Feng, Z.; Feng, Z. Y.; Gou, Q. B.; Guo, Y. Q.; He, H. H.; Hu, Haibing; Hu, Hongbo; Huang, Q.; Iacovacci, M.; Iuppa, R.; Jia, H. Y.; Labaciren,; Li, H. J.; Li, J. Y.; Li, X. X.; Liguori, G.; Liu, C.; Liu, C. Q.; Liu, J.; Liu, M. Y.; Lü, H.; L., L.; H., X.; Mancarella, G.; Mari, Stefano Maria; Marsella, G.; Martello, D.; Mastroianni, S.; Montini, P.; Ning, C. C.; Panareo, M.; Panico, B.; Perrone, L.; Pistilli, P.; Ruggieri, F.; Salvini, P.; Santonico, R.; Sbano, S. N.; Shen, P. R.; Sheng, X. D.; Shi, Feng; Surdo, A.; Tan, Y. H.; Vallania, P.; Vernetto, S.; Vigorito, C.; Wang, Bo; Wang, H.; Wu, C. Y.; Wu, H. R.; Xu, Benda; Xue, L.; Yang, Q. Y.; Yang, X. C.; Yao, Z. G.; Yuan, A. F.; Zha, M.; Zhang, H. M.; Zhang, Jilong; Zhang, Jianli; Zhang, L.; Zhang, P.; Zhang, X. Y.; Zhang, Y.; Zhao, Jing; Zhaxiciren,; Zhaxisangzhu,; Zhou, X. X.; Zhu, F. R.; Zhu, Q. Q.; Zizzi, and G.

doi:10.1088/0004-637x/779/1/27

Cited by 84 publications

(88 citation statements)

References 38 publications

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“…A detailed account of the reconstruction algorithm can be found in Bartoli et al (2011aBartoli et al ( , 2011bBartoli et al ( , 2013Bartoli et al ( , 2015. Briefly, the shower core position is obtained by fitting the lateral density distribution of the shower charged particles with a Nishimura-Kamata-Greisenlike function using the maximum likelihood method.…”

Section: The Argo-ybj Experimentsmentioning

confidence: 99%

Study of the diffuse gamma ray emission from the Galactic plane with ARGO-YBJ

Ma¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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The events recorded by ARGO-YBJ in more than fiveyears of data collection have been analyzed to determine the diffuse gamma-ray emission in the Galactic plane at Galactic longitudes 25°< l < 100°and Galactic latitudes b 5 | | <°. The energy range covered by this analysis, from ∼350 GeV to ∼2 TeV, allows the connection of the region explored by Fermi with the multi-TeV measurements carried out by Milagro. Our analysis has been focused on two selected regions of the Galactic plane, i.e., 40°< l < 100°and 65°< l < 85°(the Cygnus region), where Milagro observed an excess with respect to the predictions of current models. Great care has been taken in order to mask the most intense gamma-ray sources, including the TeV counterpart of the Cygnus cocoon recently identified by ARGO-YBJ, and to remove residual contributions. The ARGO-YBJ results do not show any excess at sub-TeV energies corresponding to the excess found by Milagro, and are consistent with the predictions of the Fermi model for the diffuse Galactic emission. From the measured energy distribution we derive spectral indices and the differential flux at 1 TeV of the diffuse gamma-ray emission in the sky regions investigated.

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Section: The Argo-ybj Experimentsmentioning

confidence: 99%

Study of the diffuse gamma ray emission from the Galactic plane with ARGO-YBJ

Ma¹

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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“…The arrival direction is reconstructed using a least-squares method assuming a conical shape of the shower front. The angular resolution for rays ranges from 1.7 • to 0.2 • , depending on the size of the shower quantified by the number of hit pads [3].…”

Section: Resistive Plate Chambersmentioning

confidence: 99%

“…The effective area of the ARGO-YBJ array was estimated using Monte Carlo simulations [3], and found to be ∼100 m 2 at 100 GeV and ∼10,000 m 2 above 1 TeV for a zenith angle of 10 • .…”

Section: Resistive Plate Chambersmentioning

confidence: 99%

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TeV γ-ray astronomy with ground-based air-shower arrays

Mostafá

2016

EPJ Web of Conferences

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Abstract. The TeV energy band is a very exciting window into the origin of high energy cosmic radiation, particle acceleration, and the annihilation of dark matter particles. Above a few hundred GeV, ground-based experiments of very large effective areas open a new domain to study extragalactic sources at intermediate redshifts, galaxy clusters, gamma ray bursts, AGN and their flaring states, extended sources and galactic diffuse emission, and to indirect searches for dark matter. In particular, ground arrays of particle detectors -that operate with high duty cycles and large fields of view-can extend to multi-TeV energies the measurements made with experiments on satellites, and complement the observations done with air Cherenkov telescopes on the ground. Key science goals of ground arrays include performing unbiased all-sky surveys, monitoring of transient events from known (and unknown) sources, and detecting extended regions of diffuse emission. In this paper, the status and most recent results from ARGO-YBJ, Tibet AS, HAWC, and LHAASO are presented.

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“…γ-ray emitters. The list of excess regions, with their corresponding significances and TeV associations, is in table 1 [4]. In the rest of this section, a selection of results concerning the detected sources will be presented.…”

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confidence: 99%

Recent results inγ-ray astronomy with the ARGO-YBJ detector

Girolamo

2017

EPJ Web Conf.

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Abstract. The ARGO-YBJ air shower detector has been in stable data taking for five years at the YangBaJing Cosmic Ray Laboratory (Tibet, P.R. China, 4300m a.s.l.) with a duty cycle > 86% and an energy threshold of a few hundreds of GeV. With the scaler mode technique, the minimum threshold of 1 GeV can be reached. In this paper recent results in γ-ray astronomy will be presented, including those from 4.5 years of observations of the blazar Mrk 421 in common with the Fermi satellite. The detectorThe ARGO-YBJ experiment is located at Yangbajing (Tibet, P.R. China, 4300 m a.s.l.) and consists of a single layer of Resistive Plate Counters (RPCs) on a total area of about 110 × 100 m 2 . The detector has a modular structure, the basic module being a cluster (5.7 × 7.6 m 2 ), made of 12 RPCs. Each RPC is read by 80 strips (6.75×61.8 cm 2 ) which are the space pixels, logically organized in 10 independent pads (55.6 × 61.8 cm 2 ) which are individually acquired and represent the time pixels of the detector [1]. The detector carpet is connected to two different DAQ systems, which work independently: in shower mode, for each event the location and timing of each detected particle is recorded, allowing the reconstruction of the lateral distribution and of the arrival direction; in scaler mode, the counting rate of each cluster is measured every 0.5 s, with little information on the space distribution and arrival direction of the detected particles. The trigger of the shower mode was N pad ≥ 20 in a time window of 420 ns, with a rate of 3.5 kHz. In the scaler mode, for each cluster four scalers recorded the rate of counts ≥ 1, ≥ 2, ≥ 3 and ≥ 4 in a time window of 150 ns. The corresponding measured rates are, respectively, ∼40 kHz, ∼2 kHz, ∼300 Hz and ∼120 Hz [2]. The experiment has been taking data with its full layout from November 2007 to February 2013. The detector pointing accuracy, angular resolution and absolute energy calibration have been determined studying the deficit in the cosmic ray flux due to the Moon [3]. Sky surveyThe ARGO-YBJ detector surveyed the northern hemisphere, in the declination band from -10 • to 70 • , at energies above 0.3 TeV. With an integrated sensitivity down to 0.24 Crab unit (depending on the declination) after five years of data taking, six sources were detected with a statistical significance S>5 standard deviations (s.d.), and five excesses are reported as potential (S>4 s.d.) γ-ray emitters. The list of excess regions, with their corresponding significances and TeV associations, is in table 1 [4]. In the rest of this section, a selection of results concerning the detected sources will be presented. a

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TeV GAMMA-RAY SURVEY OF THE NORTHERN SKY USING THE ARGO-YBJ DETECTOR

Cited by 84 publications

References 38 publications

Study of the diffuse gamma ray emission from the Galactic plane with ARGO-YBJ

Study of the diffuse gamma ray emission from the Galactic plane with ARGO-YBJ

TeV γ-ray astronomy with ground-based air-shower arrays

Recent results inγ-ray astronomy with the ARGO-YBJ detector

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