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

Abstract

The ARGO-YBJ detector is an extensive air shower array that has been used to\nmonitor the northern $\\gamma$-ray sky at energies above 0.3 TeV from 2007\nNovember to 2013 January. In this paper, we present the results of a sky survey\nin the declination band from $-10^{\\circ}$ to $70^{\\circ}$, using data recorded\nover the past five years. With an integrated sensitivity ranging from 0.24 to\n$\\sim$1 Crab units depending on the declination, six sources have been detected\nwith a statistical significance greater than 5 standard deviations. Several\nexcesses are also reported as potential $\\gamma$-ray emitters. The features of\neach source are presented and discussed. Additionally, $95\\%$ confidence level\nupper limits of the flux from the investigated sky region are shown. Specific\nupper limits for 663 GeV $\\gamma$-ray AGNs inside the ARGO-YBJ field of view\nare reported. The effect of the absorption of $\\gamma$-rays due to the\ninteraction with extragalactic background light is estimated.\n