A Northern Sky Survey for Steady Tera–Electron Volt Gamma‐Ray Point Sources Using the Tibet Air Shower Array
Open Access
- 10 November 2005
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 633 (2) , 1005-1012
- https://doi.org/10.1086/491612
Abstract
Results of a steady TeV γ-ray point-source search using data taken from the Tibet HD (1997 February-1999 September) and Tibet III (1999 November-2001 October) arrays are presented. From 0° to 60° 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 cross-checking, two independently developed analyses are used in this work.Keywords
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