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Testing the Axion-Conversion Hypothesis of 3.5 keV Emission with Polarization
Gong, Yan1; Chen, Xuelei1,2,3; Feng, Hua4,5
2017-02-10
Source PublicationPHYSICAL REVIEW LETTERS
Volume118Issue:6
AbstractThe recently measured 3.5 keV line in a number of galaxy clusters, the Andromeda galaxy (M31), and the Milky Way (MW) center can be well accounted for by a scenario in which dark matter decays to axionlike particles (ALPs) and subsequently convert to 3.5 keV photons in magnetic fields of galaxy clusters or galaxies. We propose to test this hypothesis by performing x-ray polarization measurements. Since ALPs can only couple to photons with a polarization orientation parallel to the magnetic field, we can confirm or reject this model by measuring the polarization of the 3.5 keV line and compare it to the orientation of the magnetic field. We discuss luminosity and polarization measurements for both a galaxy cluster and spiral galaxy, and provide a general relation between the polarization and galaxy inclination angle. This effect is marginally detectable with x-ray polarimetry detectors currently under development, such as the enhanced X-ray Timing and Polarization satellite, the Imaging X-ray Polarimetry Explorer and the X-ray Imaging Polarimetry Explorer. The sensitivity can be further improved in the future with detectors of a larger effective area or better energy resolutions.
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationChinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; MoST 863 program(2012AA121701) ; MoST 863 program(2012AA121701) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Strategic Priority Research Program(XDB09020301) ; CAS Strategic Priority Research Program(XDB09020301) ; NSFC(11373030 ; NSFC(11373030 ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; 11633004 ; 11633004 ; 11633003) ; 11633003) ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; MoST 863 program(2012AA121701) ; MoST 863 program(2012AA121701) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Strategic Priority Research Program(XDB09020301) ; CAS Strategic Priority Research Program(XDB09020301) ; NSFC(11373030 ; NSFC(11373030 ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; 11633004 ; 11633004 ; 11633003) ; 11633003)
DOI10.1103/PhysRevLett.118.061101
WOS KeywordX-RAY-LINE ; DARK-MATTER ; MAGNETIC-FIELDS ; CHARGE-EXCHANGE ; MECHANISM ; CLUSTERS ; PHOTON ; SIGNAL
Indexed BySCI
Language英语
Funding OrganizationChinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; MoST 863 program(2012AA121701) ; MoST 863 program(2012AA121701) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Strategic Priority Research Program(XDB09020301) ; CAS Strategic Priority Research Program(XDB09020301) ; NSFC(11373030 ; NSFC(11373030 ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; 11633004 ; 11633004 ; 11633003) ; 11633003) ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; MoST 863 program(2012AA121701) ; MoST 863 program(2012AA121701) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Frontier Science Key Project(QYZDJ-SSW-SLH017) ; CAS Strategic Priority Research Program(XDB09020301) ; CAS Strategic Priority Research Program(XDB09020301) ; NSFC(11373030 ; NSFC(11373030 ; Tsinghua University Initiative Scientific Research Program ; Tsinghua University Initiative Scientific Research Program ; 11633004 ; 11633004 ; 11633003) ; 11633003)
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000393747300002
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8299
Collection星系宇宙学研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Key Lab Computat Astrophys, 20A Datun Rd, Beijing 100012, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
4.Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China
5.Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China
Recommended Citation
GB/T 7714
Gong, Yan,Chen, Xuelei,Feng, Hua. Testing the Axion-Conversion Hypothesis of 3.5 keV Emission with Polarization[J]. PHYSICAL REVIEW LETTERS,2017,118(6).
APA Gong, Yan,Chen, Xuelei,&Feng, Hua.(2017).Testing the Axion-Conversion Hypothesis of 3.5 keV Emission with Polarization.PHYSICAL REVIEW LETTERS,118(6).
MLA Gong, Yan,et al."Testing the Axion-Conversion Hypothesis of 3.5 keV Emission with Polarization".PHYSICAL REVIEW LETTERS 118.6(2017).
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