A Northern Sky Survey for Steady TeV Gamma-Ray Point Sources Using the Tibet Air Shower Array

Details A Northern Sky Survey for Steady TeV Gamma-Ray Point Sources Using the Tibet Air Shower Array A Northern Sky Survey for Steady TeV Gamma-Ray Point Sources Using the Tibet Air Shower Array

2005-02-02

arxiv.org/abs/astro-ph/0502039v2

Astrophys.J. 633 (2005) 1005-1012

Astronomy and Astrophysics

Astrophysics

21 pages, 6 figures. accepted by ApJ

Scientific paper

Results on steady TeV $\gamma$-ray point source search using data taken from the Tibet HD (Feb. 1997 -- Sep. 1999) and Tibet III (Nov. 1999 -- Oct. 2001) arrays are presented. From $0^{\circ}$ to $60^{\circ}$ in declination, significant excesses from the well-known steady source Crab Nebula and the high state of the flare type source Markarian 421 are observed. Because the levels of significance from other positions are not sufficiently high, 90% confidence level upper limits on the flux are set assuming different power law spectra. To allow crosschecking, two independently developed analyses are used in this work.

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