| タイトル | Searching for Dark Matter Annihilation in the Smith High-Velocity Cloud |
| 本文（外部サイト） | http://hdl.handle.net/2060/20150007915 |
| 著者（英） | Drlica-Wagner, Alex; Hewitt, John W.; Gomez-Vargas, German A.; Linden, Tim; Tibaldo, Luigi |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2014-06-27 |
| 言語 | eng |
| 内容記述 | Recent observations suggest that some high-velocity clouds may be confined by massive dark matter halos. In particular, the proximity and proposed dark matter content of the Smith Cloud make it a tempting target for the indirect detection of dark matter annihilation. We argue that the Smith Cloud may be a better target than some Milky Way dwarf spheroidal satellite galaxies and use gamma-ray observations from the Fermi Large Area Telescope to search for a dark matter annihilation signal. No significant gamma-ray excess is found coincident with the Smith Cloud, and we set strong limits on the dark matter annihilation cross section assuming a spatially extended dark matter profile consistent with dynamical modeling of the Smith Cloud. Notably, these limits exclude the canonical thermal relic cross section (approximately 3 x 10 (sup 26) cubic centimeters per second) for dark matter masses less than or approximately 30 gigaelectronvolts annihilating via the B/B- bar oscillation or tau/antitau channels for certain assumptions of the dark matter density profile; however, uncertainties in the dark matter content of the Smith Cloud may significantly weaken these constraints. |
| NASA分類 | Astrophysics; Astronomy; Physics of Elementary Particles and Fields |
| レポートNO | GSFC-E-DAA-TN17368 |
| 権利 | Copyright, Distribution under U.S. Government purpose rights |
