TeV Gamma‐Ray Survey of the Northern Hemisphere Sky Using the Milagro Observatory

Citations Over TimeTop 10% of 2004 papers

Abstract

Milagro is a water Cerenkov extensive air shower array that continuously monitors the entire overhead sky in the TeV energy band. The results from an analysis of ~3 yr of data (2000 December-2003 November) are presented. The data have been searched for steady point sources of TeV gamma rays between declinations of 11 and 80°. Two sources are detected, the Crab Nebula and the active galaxy Mrk 421. For the remainder of the northern hemisphere, we set 95% confidence level (CL) upper limits between 275 and 600 mcrab (4.8 × 10-12 to 10.5 × 10-12 cm-2 s-1) above 1 TeV for source declinations between 5° and 70°. Since the sensitivity of Milagro depends on the spectrum of the source at the top of the atmosphere, the dependence of the limits on the spectrum of a candidate source is presented. Because high-energy gamma rays from extragalactic sources are absorbed by interactions with the extragalactic background light, the dependence of the flux limits on the redshift of a candidate source are given. The upper limits presented here are over an order of magnitude more stringent than previously published limits from TeV gamma-ray all-sky surveys.

Related Papers

• → Multiple AGN in the crowded field of the compact group SDSS J0959+1259(2015)12 cited
• → Sky monitoring with ARGO-YBJ(2009)12 cited
• → First results from a deeper survey of a southern redshift slice(1989)4 cited
• → A Northen Sky Survey for both Steady TeV Gamma-Ray Point Source and large scale anisotropy of Cosmic Ray intensity Using the Tibet Air Shower Array(2005)