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Radial Profile of the 3.5 kev Line Out to R200 in the Perseus ClusterThe recent discovery of the unidentified emission line at 3.5 keV in galaxies and clusters has attracted great interest from the community. As the origin of the line remains uncertain, we study the surface brightness distribution of the line in the Perseus cluster since that information can be used to identify its origin. We examine the flux distribution of the 3.5 keV line in the deep Suzaku observations of the Perseus cluster in detail. The 3.5 keV line is observed in three concentric annuli in the central observations, although the observations of the outskirts of the cluster did not reveal such a signal. We establish that these detections and the upper limits from the non-detections are consistent with a dark matter decay origin. However, absence of positive detection in the outskirts is also consistent with some unknown astrophysical origin of the line in the dense gas of the Perseus core, as well as with a dark matter origin with a steeper dependence on mass than the dark matter decay. We also comment on several recently published analyses of the 3.5 keV line.
Document ID
20170006114
Document Type
Reprint (Version printed in journal)
Authors
Franse, Jeroen (Leiden Univ. Netherlands)
Bulbul, Esra (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Foster, Adam (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Boyarsky, Alexey (Leiden Univ. Netherlands)
Markevitch, Maxim (NASA Goddard Space Flight Center Greenbelt, MD United States)
Bautz, Mark (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Lakubovskyi, Dmytro (Niels Bohr Inst. Copenhagen, Denmark)
Loewenstein, Michael (Maryland Univ. College Park, MD, United States)
McDonald, Michael (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Miller, Eric (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Randall, Scott W. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Ruchayskiy, Oleg (Niels Bohr Inst. Copenhagen, Denmark)
Smith, Randall K. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
July 6, 2017
Publication Date
September 29, 2016
Publication Information
Publication: The Astrophysical Journal
Volume: 829
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN43711
Funding Number(s)
CONTRACT_GRANT: NNX123AE77G
CONTRACT_GRANT: NNG17PT01A
CONTRACT_GRANT: NNX14AF78G
CONTRACT_GRANT: NNX15AE16G
Distribution Limits
Public
Copyright
Other
Keywords
dark matter – elementary particles – galaxies: clusters: individual (Perseus