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Chinese Physics C> 2005, Vol. 29> Issue(1) : 62-67 

Study on the Sensitivity in Detecting Crab Nebula by ARGO-YBJ Experiment

  •  Institute of High Energy Physics,CAS,Beijing 100049,China2 Physics Department,Hebei Normal University,Shijiazhuang 050016,China

  • A“full coverage”air shower array,ARGO (Astrophysical Radiation with Groundbased Observatory) experiment is under construction currently at YangBaJing in Tibet,China.Its altitude of 4,300m above see level is equivalent to an atmospheric depth of 606g/cm2.ARGO experiment makes use of a full–coverage detector consisting of a layer of single gap Resistive Plate Chambers (RPC).The phase Ⅰ detector, including a central (74×78m2) part and a guard ring in size of 6400m2,will be operated in 2005. one of the main goals of ARGO is to detect VHE gamma ray emission from galactic and extragalactic sources. With full Monte-Carlo simulation we studied the detector's angular resolution and found that the angular resolution strongly depends on the number of fired pads npads.With three statistical methods we estimated ARGO's sensitivity in detecting Crab Nebula.According to our simulation, in one year's operation,Crab Nebula will be detected by ARGO with a statistical significance of about 18 standard deviation without appeying any gamma/hadron identification technique.
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    [1] . Horan D, WeekesT C. 2003, [ arXiv: astro-ph/ 0310391]2. Amenomori M et al . ApJ. , 1999, 525: L93 - L963. Amenomori M et al . ApJ. , 2000, 532: 302 - 3074. Amenomori M et al . ApJ. , 2003, 598: 242-2495. HE Hui-Hai et al . HEP NP, 2001, 25(1) : 79-85 (in Chinese)(何会海等.高能物理与核物理，2001,25(1):79-85)6. LIU Kun et al. HEP NP, 2004, 28: 914(in Chinese)(刘琨等，高能物理与核物理，2004, 28: 914)7. LI T P. Mathematical Methods of Experiment. Beijing: Science Press,1980. 46-50 (in Chinese)(李惕碚.实验的数学处理.北京:科学出版社，1980. 46-50)8. Hillas A M et al. ApJ. , 1998, 530: 7449. Gaisser T K et al. Proc. 27th ICRC, Hamburg ( Germany) , 2001.1643-164610. WANG Bao-Sheng et al. HEP NP, 2004, 28( 7) : 679 (in Chinese)(王保胜等.高能物理与核物理,2004,28(7):679)11. XU Chun-Xian et al. HEP NP, 2001, 25( 9) : 807-811(in Chinese)(徐春娴等.高能物理与核物理，2001, 25(9):807-811)12. HU Hong-Bo. Proc. 28th ICRC, Tsukuba ( Japan) , 2003. 3027

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CUI Shu-Wang, HU Hong-Bo, WANG Huan-Yu, LU Hong and TAN Yong-Heng. Study on the Sensitivity in Detecting Crab Nebula by ARGO-YBJ Experiment[J]. Chinese Physics C, 2005, 29(1): 62-67.
CUI Shu-Wang, HU Hong-Bo, WANG Huan-Yu, LU Hong and TAN Yong-Heng. Study on the Sensitivity in Detecting Crab Nebula by ARGO-YBJ Experiment[J]. Chinese Physics C, 2005, 29(1): 62-67. shu
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Received: 2004-04-21
Revised: 1900-01-01
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Study on the Sensitivity in Detecting Crab Nebula by ARGO-YBJ Experiment

    Corresponding author: CUI Shu-Wang,
  • Institute of High Energy Physics,CAS,Beijing 100049,China2 Physics Department,Hebei Normal University,Shijiazhuang 050016,China
  • Received Date: 2004-04-21
  • Accepted Date: 1900-01-01
  • Available Online: 2005-01-05

Abstract: A“full coverage”air shower array,ARGO (Astrophysical Radiation with Groundbased Observatory) experiment is under construction currently at YangBaJing in Tibet,China.Its altitude of 4,300m above see level is equivalent to an atmospheric depth of 606g/cm2.ARGO experiment makes use of a full–coverage detector consisting of a layer of single gap Resistive Plate Chambers (RPC).The phase Ⅰ detector, including a central (74×78m2) part and a guard ring in size of 6400m2,will be operated in 2005. one of the main goals of ARGO is to detect VHE gamma ray emission from galactic and extragalactic sources. With full Monte-Carlo simulation we studied the detector's angular resolution and found that the angular resolution strongly depends on the number of fired pads npads.With three statistical methods we estimated ARGO's sensitivity in detecting Crab Nebula.According to our simulation, in one year's operation,Crab Nebula will be detected by ARGO with a statistical significance of about 18 standard deviation without appeying any gamma/hadron identification technique.

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