Evidence for New Unidentified TeV γ -ray Sources from Directionally-Correlated Sky Fluctuations observed by Northern Sky Surveys by the Milagro Observatory and the Tibet Air Shower Array

Details Evidence for New Unidentified TeV γ -ray Sources from Directionally-Correlated Sky Fluctuations observed by Northern Sky Surveys by the Milagro Observatory and the Tibet Air Shower Array Evidence for New Unidentified TeV γ -ray Sources from Directionally-Correlated Sky Fluctuations observed by Northern Sky Surveys by the Milagro Observatory and the Tibet Air Shower Array

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.0409k&link_type=abstract

American Astronomical Society, HEAD meeting #8, #04.09; Bulletin of the American Astronomical Society, Vol. 36, p.909

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We have examined the directional cross-correlation of statisical `hot-spots' between a Northern Sky TeV Gamma Ray Survey by the Milagro Observatory and a similar Northern Sky TeV Gamma Ray Survey by the Tibet Array. We find the directions of these hotspots are angularly uncorrelated between the two surveys for large angular separations (Δ θ > 4o), but there appears to be a statistically significant correlation between hot-spot directions for Δ θ < 1.5o. Independent simulations indicate the chance probability for observing this correlation at small angular separation is approximately 10-5, indicating the existence of one or more previously unobserved TeV γ -ray sources with a flux at 500 to 700 milliCrab. The data is consistent with both a point-like source or a diffuse emission with extent of 1o-2^o. > The source may be steady or time-episodic, and could also possess non-conventional γ -ray energy spectrum with a strong emission component beginning above 1-2 TeV.

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