Gamma ray sources observation with the ARGO-YBJ detector

6533b86efe1ef96bd12cc8e2

RESEARCH PRODUCT

Gamma ray sources observation with the ARGO-YBJ detector

Aielli G Bacci C Bartoli B Bernardini P Bi Xj Bleve C Branchini P Budano A Calabrese Melcarne Ak Camarri P Cao Z Cappa A Cardarelli R Catalanotti S Cattaneo C Celio P Chen Sz Chen Tl Chen Y Cheng N Creti P Cui Sw Dai Bz D'ali Staiti G Danzengluobu Dattoli M De Mitri I D'ettorre Piazzoli B Mario De Vincenzi Di Girolamo T Ding Xh Di Sciascio G Feng Cf Feng Zhao Yang Feng Zhen Yong Galeazzi F Galeotti P Gargana R Gou Qb Guo Yq He Hh Hu Haibing Hu Hong Bo Huang Q Iacovacci M Iuppa R James I Jia Hy Labaciren Li Hj Li Jy Li Xx Liberti B Liguori G Liu C Liu Cq Liu My Liu J Lu H Ma Xh Mancarella G Marsella G Martello D Mastroianni S Meng Xr Montini P Ning Cc Pagliaro A Panareo M Perrone L Pistilli P Qu Xb Rossi E Ruggieri F Saggese L Salvini P Santonico R Shen Pr Sheng Xd Shi F Stanescu C Surdo A Tan Yh Vallania P Vernetto S Vigorito C Wang B Wang H Wu Cy Wu Hr Xu B Xue L Yan Yx Yang Qy Yang Xc Yuan Af Zha M Zhang Hm Zhang Ji Long Zhang Jian Li Zhang L Zhang P Zhang Xy Zhang Y Zhaxisangzhu Zhou Xx Zhu Fr Zhu Qq Zizzi G.Severino Angelo Maria Bussino Stefano Maria Mari

subject

Physics Nuclear and High Energy Physics Gamma Astronomy Physics and Astronomy (miscellaneous)Astrophysics::High Energy Astrophysical Phenomena Detector Gamma ray Flux Astronomy Extensive Air Shower Astronomy and Astrophysics Astrophysics Gamma-ray astronomy Array Detector Gamma-Ray Argo-Ybj Gamma Astronomy Array Detector Crab Nebula Air shower Pulsar Milagro Blazar Instrumentation Argo

description

In this paper we report on the observations of TeV gamma ray sources performed by the air shower de- tector ARGO-YBJ. The objects studied in this work are the blazar Markarian 421 and the extended galactic source MGROJ1908+06, monitored during 2 years of operation. Mrk421 has been detected by ARGO-YBJ with a statisti- cal significance of 11 standard deviations. The observed TeV emission was highly variable, showing large enhance- ments of the flux during active periods. The study of the spectral behaviour during flares revealed a positive correla- tion of the hardness with the flux, as already reported in the past by the Whipple telescope, suggesting that this is a long term property of the source. ARGO-YBJ observed a strong correlation between TeV gamma rays and the X-ray flux measured by RXTM/ASM and SWIFT/BAT during the whole period, with a time lag compatible with zero, supporting the one-zone SSC model to describe the emission mechanism. MGROJ1908+06 has been detected by ARGO-YBJ with 5 standard deviation of significance. From our data the source appears extended and the measured extension is ext=0.48 +0.26 0.28 , in agreement with a previous HESS obser- vation. The average flux is in marginal agreement with that reported by MILAGRO, but significantly higher than that ob- tained by HESS, suggesting a possible flux variability. The large field of view ( 2 sr) and the high duty cycle allow a continuous monitoring of the sky in the declination band from 0 to 70 . In this paper we report on the ob- servations of two bright gamma ray sources, performed dur- ing 2 years: the blazar Mrk421 and the extended galactic source MGROJ1908+06.

year	journal	country	edition	language
2011-01-01	Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

https://doi.org/10.1016/j.nima.2012.01.041