GALACTIC DIFFUSE GAMMA RAYS-RECALCULATION BASED ON NEW MEASUREMENTS OF THE COSMIC ELECTRON SPECTRUM
Zhang, JA; Yuan, QQ; Bi, XJ; Zhang J(张娟); Yuan Q(袁强); Bi XJ(毕效军)
刊名ASTROPHYSICAL JOURNAL
2010
卷号720期号:1页码:9-19
关键词cosmic rays dark matter gamma rays: diffuse background
学科分类Astronomy & Astrophysics
DOI10.1088/0004-637X/720/1/9
通讯作者Zhang, JA (reprint author), Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China.
文章类型Article
英文摘要In this work, we revisit the all-sky Galactic diffuse gamma-ray emission taking into account new measurements of the cosmic ray (CR) electron/positron spectrum by PAMELA, ATIC, and Fermi, which show excesses of cosmic electrons/positrons beyond the expected fluxes in the conventional model. Since the origins of the extra electrons/positrons are not clear, we consider three different scenarios to account for the excesses: astrophysical sources such as Galactic pulsars, dark matter (DM) decay, and DM annihilation. Further, new results from Fermi-LAT on the (extra-)Galactic diffuse gamma-rays are adopted. The background CRs without the new sources give lower diffuse gamma-rays compared to the Fermi-LAT observation, which is consistent with previous analysis. The scenario with astrophysical sources predicts diffuse gamma-rays with little difference with the background. The DM annihilation models with tau(+/-) final state are disfavored by the Fermi diffuse gamma-ray data, while there are only a few constraints on the decaying DM scenario. Furthermore, there is always a bump at higher energies (similar to TeV) of the diffuse gamma-ray spectra for the DM scenarios due to final state radiation. Finally, we find that the Fermi-LAT diffuse gamma-ray data can be explained by simply enlarging the normalization of the electron spectrum without introducing any new sources, which may indicate that the current constraints on the DM models can be much stronger given a precise background estimate.
类目[WOS]Astronomy & Astrophysics
收录类别SCI
WOS记录号WOS:000281596000002
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225476
专题中国科学院高能物理研究所_粒子天体物理中心_期刊论文
中国科学院高能物理研究所_粒子天体物理中心
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Zhang, JA,Yuan, QQ,Bi, XJ,et al. GALACTIC DIFFUSE GAMMA RAYS-RECALCULATION BASED ON NEW MEASUREMENTS OF THE COSMIC ELECTRON SPECTRUM[J]. ASTROPHYSICAL JOURNAL,2010,720(1):9-19.
APA Zhang, JA,Yuan, QQ,Bi, XJ,张娟,袁强,&毕效军.(2010).GALACTIC DIFFUSE GAMMA RAYS-RECALCULATION BASED ON NEW MEASUREMENTS OF THE COSMIC ELECTRON SPECTRUM.ASTROPHYSICAL JOURNAL,720(1),9-19.
MLA Zhang, JA,et al."GALACTIC DIFFUSE GAMMA RAYS-RECALCULATION BASED ON NEW MEASUREMENTS OF THE COSMIC ELECTRON SPECTRUM".ASTROPHYSICAL JOURNAL 720.1(2010):9-19.
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