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

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

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...608..680a&link_type=abstract

The Astrophysical Journal, Volume 608, Issue 2, pp. 680-685.

Astronomy and Astrophysics

Astronomy

44

Galaxies: Active, Gamma Rays: Observations, Surveys

Scientific paper

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 1.1d 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.

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