γ-radiation from the Galactic Center: dark matter annihilation or more conservative astrophysical models?

Details γ-radiation from the Galactic Center: dark matter annihilation or more conservative astrophysical models? γ-radiation from the Galactic Center: dark matter annihilation or more conservative astrophysical models?

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jphcs.133a2032z&link_type=abstract

Journal of Physics: Conference Series, Volume 133, Issue 1, pp. 012032 (2008).

Physics

2

Scientific paper

The existence of dark matter (DM) at scales of few pc down to ~ 10-5 pc around the centers of galaxies and in particular in the Galactic Center region has been considered in the literature. Under the assumption that such a DM clump, principally constituted by non-baryonic matter (like WIMPs) does exist at the center of our galaxy, the study of the γ-ray emission from the Galactic Center region allows us to constrain both the mass and the size of this DM sphere. Further constraints on the DM distribution parameters may be derived by observations of bright infrared stars around the Galactic Center. Here, we discuss the constraints that can be obtained with the orbit analysis of stars (as S2 and S16) moving inside the DM concentration with present and next generations of large telescopes. In particular, consideration of the S2 star apoastron shift may allow improving limits on the DM mass and size. Further technological progress in a star orbit reconstruction and apocenter shift could detect features of bulk matter distributions or put so strict constraints on bulk mass matter (including DM) distributions that it will be impossible to explain γ-flux with DM annihilation.

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