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题名: Searching for spectral oscillations due to photon-axionlike particle conversion using the Fermi-LAT observations of bright supernova remnants
作者: Xia, Zi-Qing; Zhang, Cun; Liang, Yun-Feng; Feng, Lei; Yuan, Qiang; Fan, Yi-Zhong; Wu, Jian
刊名: PHYSICAL REVIEW D
出版日期: 2018
卷号: 97, 期号:6, 页码:63003
英文摘要: Axionlike particles (ALPs) are one promising type of dark matter candidate particle that may generate detectable effects on gamma-ray spectra other than the canonical weakly interacting massive particles. In this work we search for such oscillation effects in the spectra of supernova remnants caused by the photon-ALP conversion, using the Fermi Large Area Telescope data. Three bright supernova remnants, IC443, W44, and W51C, are analyzed. The inclusion of photon-ALP oscillations yields an improved fit to the gamma-ray spectrum of IC443, which gives a statistical significance of 4.2 sigma in favor of such spectral oscillation. However, the best-fit parameters of ALPs (m(a) = 6.6 neV, g(a gamma) = 13.4 x 10(-11) GeV-1) are in tension with the upper bound (g(a gamma) < 6.6 x 10(-11) GeV-1) set by the CAST experiment. It is difficult to explain the results using the systematic uncertainties of the flux measurements. We speculate that the "irregularity" displayed in the spectrum of IC443 may be due to the superposition of the emission from different parts of the remnant.
语种: 英语
WOS记录号: WOS:000426781100001
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/18079
Appears in Collections:近地天体探测和太阳系天体研究团组_期刊论文

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