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Title: Air Shower Detection and Sky Survey with the ARGO-YBJ Experiment

Abstract

The ARGO-YBJ detector, located in Tibet at 4300 m a.s.l., is a full-coverage Extensive Air-Shower Array consisting of a single layer of Resistive Plate Chambers. The main scientific goals of the experiment are the study of cosmic rays and the detection of astrophysical {gamma} radiation at few hundreds GeV energy threshold. About 30% of the foreseen active area is in stable data taking since December 2004. The analysis of first data shows that the detector is working properly and that ARGO-YBJ has the capability to image extensive air showers with unprecedented granularity and to monitor continuously the Northern Sky searching for steady and transient sources of {gamma}-rays. In this paper we report some results about the air shower detection and the first sky map covering the declination band -20 deg. < {delta} <80 deg.

Authors:
 [1];  [2]
  1. Dipartimento di Fisica dell'Universita, via per Arnesano, 73100 Lecce (Italy)
  2. (Italy)
Publication Date:
OSTI Identifier:
20798048
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 815; Journal Issue: 1; Conference: 25. international conference on physics in collision, Prague (Czech Republic), 5-9 Jul 2005; Other Information: DOI: 10.1063/1.2173596; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMIC GAMMA SOURCES; COSMIC PHOTONS; COSMIC RAY DETECTION; EXTENSIVE AIR SHOWERS; GAMMA DETECTION; GEV RANGE 100-1000

Citation Formats

Bleve, C., and Sezione INFN di Lecce, via per Arnesano, 73100 Lecce. Air Shower Detection and Sky Survey with the ARGO-YBJ Experiment. United States: N. p., 2006. Web. doi:10.1063/1.2173596.
Bleve, C., & Sezione INFN di Lecce, via per Arnesano, 73100 Lecce. Air Shower Detection and Sky Survey with the ARGO-YBJ Experiment. United States. doi:10.1063/1.2173596.
Bleve, C., and Sezione INFN di Lecce, via per Arnesano, 73100 Lecce. Wed . "Air Shower Detection and Sky Survey with the ARGO-YBJ Experiment". United States. doi:10.1063/1.2173596.
@article{osti_20798048,
title = {Air Shower Detection and Sky Survey with the ARGO-YBJ Experiment},
author = {Bleve, C. and Sezione INFN di Lecce, via per Arnesano, 73100 Lecce},
abstractNote = {The ARGO-YBJ detector, located in Tibet at 4300 m a.s.l., is a full-coverage Extensive Air-Shower Array consisting of a single layer of Resistive Plate Chambers. The main scientific goals of the experiment are the study of cosmic rays and the detection of astrophysical {gamma} radiation at few hundreds GeV energy threshold. About 30% of the foreseen active area is in stable data taking since December 2004. The analysis of first data shows that the detector is working properly and that ARGO-YBJ has the capability to image extensive air showers with unprecedented granularity and to monitor continuously the Northern Sky searching for steady and transient sources of {gamma}-rays. In this paper we report some results about the air shower detection and the first sky map covering the declination band -20 deg. < {delta} <80 deg.},
doi = {10.1063/1.2173596},
journal = {AIP Conference Proceedings},
number = 1,
volume = 815,
place = {United States},
year = {Wed Feb 08 00:00:00 EST 2006},
month = {Wed Feb 08 00:00:00 EST 2006}
}
  • 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 reportedmore » 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.« less
  • The proton-air cross section in the energy range 1-100 TeV has been measured by the ARGO-YBJ cosmic ray experiment. The analysis is based on the primary cosmic ray flux attenuation for different atmospheric depths (i.e. zenith angles) and exploits the detector capabilities of selecting the shower development stage by means of hit multiplicity, density and lateral profile measurements at ground. The effects of shower fluctuations, the contribution of heavier primaries and the uncertainties of the hadronic interaction models, have been taken into account. The results have been used to estimate the total proton-proton cross section at center-of-mass energies between 70more » and 500 GeV, where no accelerator data are currently available.« less
  • The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a “full coverage” (central carpet with an active area of ∼93%) air shower array dedicated to gamma-ray astronomy and cosmic-ray studies. The wide field of view (∼2 sr) and high duty cycle (>86%), made ARGO-YBJ suitable to search for short and unexpected gamma-ray emissions like gamma-ray bursts (GRBs). Between 2007 November 6 and 2013 February 7, 156 satellite-triggered GRBs (24 of them with known redshift) occurred within the ARGO-YBJ field of view (zenith angle θ ≤ 45°). A search for possible emissionmore » associated with these GRBs has been made in the two energy ranges 10–100 GeV and 10–1000 GeV. No significant excess has been found in time coincidence with the satellite detections nor in a set of different time windows inside the interval of one hour after the bursts. Taking into account the EBL absorption, upper limits to the energy fluence at a 99% confidence level have been evaluated, with values ranging from ∼10{sup −5} erg cm{sup −2} to ∼10{sup −1} erg cm{sup −2}. The Fermi -GBM burst GRB 090902B, with a high-energy photon of 33.4 GeV detected by Fermi -LAT, is discussed in detail.« less
  • The ARGO-YBJ experiment, under construction at the Yangbaijing Laboratory (P.R. China, 4300 m a.s.l.), is a full coverage detector of dimension 74 x 78 m2 made by a single layer of Resistive Plate Counters. About 10% of the final active area ({approx} 700 m2) is in stable operation to check the detector performance and the reconstruction algorithms. In this paper the status of the experiment and the analysis of the first data are presented.
  • The ARGO-YBJ experiment, currently under construction at the YangBaJing Laboratory (Tibet, P.R. China, 4300 m a.s.l.), could be upgraded with a large ({approx} 2500 m2) muon detector both to extend the sensitivity to {gamma}-ray sources to energies greater than {approx} 20 TeV and to perform a cosmic ray primary composition study. In this paper we present an evaluation of the rejection power for proton-induced showers achievable with the upgraded ARGO-YBJ detector. Minimum detectable {gamma}-ray fluxes are calculated for different experimental setups.