抄録
We searched for steady PeV gamma-ray emission from the Monogem ring region with the Tibet air shower array from 1997 February to 2004 October. No evidence for statistically significant gamma-ray signals was found in a region 111° ≤ R.A. < 114°, 12.°5 < decl. < 15°.5 in the Monogem ring where the MAKET-ANI experiment recently claimed a positive detection of PeV high-energy cosmic radiation, although our flux sensitivity is approximately 10 times better than MAKET-ANI's. We set the most stringent integral flux upper limit at a 99% confidence level of 4.0 × 10-12 cm-2 s-1 sr-1 above 1 PeV on diffuse gamma rays extended in the 3° × 3° region.
本文言語 | English |
---|---|
ジャーナル | Astrophysical Journal |
巻 | 635 |
号 | 1 II |
DOI | |
出版ステータス | Published - 2005 12月 10 |
ASJC Scopus subject areas
- 宇宙惑星科学