Constraints on Parameters of Radiatively Decaying Dark Matter from the Galaxy Cluster 1E 0657−56 | Zendy

Alexey Boyarsky | Zendy; Oleg Ruchayskiy | Zendy; M. Markevitch | Zendy

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Constraints on Parameters of Radiatively Decaying Dark Matter from the Galaxy Cluster 1E 0657−56

Author(s) -

Alexey Boyarsky,

Oleg Ruchayskiy,

M. Markevitch

Publication year - 2008

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/524397

Subject(s) - physics , dark matter , sterile neutrino , astrophysics , galaxy cluster , neutrino , cluster (spacecraft) , dark matter halo , galaxy , gravitational lens , halo , weak gravitational lensing , particle physics , neutrino oscillation , redshift , computer science , programming language

We derived constraints on parameters of a radiatively decaying warm darkmatter particle, e.g., the mass and mixing angle for a sterile neutrino, usingChandra X-ray spectra of a galaxy cluster 1E0657-56 (the ``bullet'' cluster).The constraints are based on nondetection of the sterile neutrino decayemission line. This cluster exhibits spatial separation between the hotintergalactic gas and the dark matter, helping to disentangle their X-raysignals. It also has a very long X-ray observation and a total mass measuredvia gravitational lensing. This makes the resulting constraints on sterileneutrino complementary to earlier results that used different cluster massestimates. Our limits are comparable to the best existing constraints.Comment: 6p

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