Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-30
Mon.Not.Roy.Astron.Soc.Lett.362:L30-L34,2005
Astronomy and Astrophysics
Astrophysics
5 pages, MNRAS style
Scientific paper
10.1111/j.1745-3933.2005.00068.x
We found significant correlations between the arrival directions of the highest energy photons (E>10 GeV) observed by EGRET and positions of the BL Lac type objects (BL Lacs). The observed correlations imply that not less than three per cent of extragalactic photons at these energies originate from BL Lacs. Some of the correlating BL Lacs have no counterparts in the EGRET source catalog, i.e. do not coincide with strong emitters of gamma-rays at lower energy. The study of correlating BL Lacs suggests that they may form a subset which is statistically different from the total BL Lac catalog; we argue that they are prominent candidates for TeV gamma-ray sources. Our results demonstrate that the analysis of positional correlations is a powerful approach indispensable in cases when low statistics limits or even prohibits the standard case-by-case identification.
Gorbunov Dmitry S.
Tinyakov Peter G.
Tkachev Igor I.
Troitsky Sergey V.
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