Surveying the Tev Sky with Milagro

A wide field of view, high duty factor TeV gamma-ray observatory is essential for studying TeV astrophysical sources, because most of these sources are either highly variable or are extended. Milagro is such a TeV detector and has performed the deepest survey of the Northern Hemisphere sky at TeV energies. In addition to detecting the Crab Nebula and Mrk 421, which are known TeV sources, Milagro has made the first detection of diffuse TeV emission from the Galactic plane. The Milagro data has been searched for unknown point sources and extended sources. Recently the Milagro Collaboration has reported the detection of very high energy (VHE) gamma rays from the Cygnus Region. In this region evidence for diffuse emission and for a new TeV source, coincident with an EGRET unidentified source, is seen. Milagro has also performed a search for very high energy gamma rays from GRBs. The Milagro data has also been searched for TeV emission from gamma-ray bursts, galaxy clusters, and EGRET unidentified sources. Solar energetic particles from coronal mass ejections have been detected by Milagro. 1 The Milagro detector Milagro is a water Cherenkov extensive air-shower detector located near Los Alamos, in New Mexico at 2630m above sea level, consisting of a 5, 000m2 central (pond) detector surrounded by an array of 175 equipped water tanks,