Published November 15, 2008
| Published
Journal Article
Open
Can proper motions of dark-matter subhalos be detected?
Abstract
One of the goals of NASA's Fermi Gamma-ray Space Telescope (formerly GLAST) will be the detection of gamma rays from dark-matter annihilation in the Galactic halo. Theoretical arguments suggest that dark matter may be bound into subhalos with masses as small as 10^-4–10^2M⊕. If so, it may be possible to detect individual subhalos as point sources in the Fermi Telescope. It has further been argued that some of these point sources may exhibit proper motions. Here we show that upper limits to the diffuse gamma-ray background constrain the number of subhalos close enough to exhibit proper motions to be less than one.
Additional Information
© 2008 The American Physical Society. (Received 4 September 2008; published 4 November 2008) We thank John Beacom for helpful comments. Work at Caltech was supported by the Sherman Fairchild Foundation (S.A.), DOE No. DE-FG03-92-ER40701, and the Gordon and Betty Moore Foundation. S.M.K. acknowledges support from Brown University.Attached Files
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Additional details
- Eprint ID
- 12321
- Resolver ID
- CaltechAUTHORS:ANDprd08
- Sherman Fairchild Foundation
- DE-FG03-92-ER40701
- Department of Energy (DOE)
- Gordon and Betty Moore Foundation
- Brown University
- Created
-
2008-11-11Created from EPrint's datestamp field
- Updated
-
2021-11-08Created from EPrint's last_modified field
- Caltech groups
- TAPIR, Moore Center for Theoretical Cosmology and Physics