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2005ApJ...635L..53A - Astrophys. J., 635, L53-L56 (2005/December-2)

Observation of PeV gamma rays from the Monogem ring with the Tibet Air Shower Array.

AMENOMORI M., AYABE S., CHEN D., CUI S.W., DANZENGLUOBU S.W., DING L.K., DING X.H., FENG C.F., FENG Z.Y., GAO X.Y., GENG Q.X., GUO H.W., HE H.H., HE M., HIBINO K., HOTTA N., HU H., HU H.B., HUANG J., HUANG Q., JIA H.Y., KAJINO F., KASAHARA K., KATAYOSE Y., KATO C., KAWATA K., LABACIREN K., LE G.M., LI J.Y., LU H., LU S.L., MENG X.R., MIZUTANI K., MU J., MUNAKATA K., NAGAI A., NANJO H., NISHIZAWA M., OHNISHI M., OHTA I., ONUMA H., OUCHI T., OZAWA S., REN J.R., SAITO T., SAITO T.Y., SAKATA M., SASAKI T., SHIBATA M., SHIOMI A., SHIRAI T., SUGIMOTO H., TAKITA M., TAN Y.H., TATEYAMA N., TORII S., TSUCHIYA H., UDO S., WANG H., WANG X., WANG Y.G., WU H.R., XUE L., YAMAMOTO Y., YAN C.T., YANG X.C., YASUE S., YE Z.H., YU G.C., YUAN A.F., YUDA T., ZHANG H.M., ZHANG J.L., ZHANG N.J., ZHANG X.Y., ZHANG Y., ZHANG Y., ZHAXISANGZHU Y., ZHOU X.X. (The Tibet AS{gamma} Collaboration)

Abstract (from CDS):

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 4.0x10–12/cm2/s/sr above 1 PeV on diffuse gamma rays extended in the 3°x3° region.

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Journal keyword(s): Gamma Rays: Observations - supernovae: individual (Monogem ring)

Simbad objects: 3

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