Study on the absorption of 10TeV gamma-rays interacting with soft photons in intergalactic space

TeV gamma rays will be attenuated or absorbed due to the interaction with soft photons in intergalactic space. The spectra of Mrk421 and MrK501 during their flaring have been observed by ACTs. Using the data obtained with Tibet Il IHD AS array from October of 1995 to Augest of 1997,the preliminary results of energy density of intergalactic infrared radiation field are presented in this paper. Analysis shows that no statistically significant absorption evidence of high energy gamma rays is found up to around 30 TeV.