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Gamma-ray Signal from Earth-mass Dark Matter Microhalos | | Tomoaki Ishiyama
; Junichiro Makino
; Toshikazu Ebisuzaki
; | | Date: |
17 Jun 2010 | | Abstract: | Earth-mass dark matter microhalos with size of $sim$ 100 AUs are the first
structures formed in the universe, if we consider neutralino as the dark matter
candidate. Early studies suggested that a noticeable fraction of microhalos
born in early universe have survived up to present time and they might be
observed as the dominant sources of the annihilation signal. On the other hand,
others claimed that small-scale structure have a negligible impact on dark
matter detectability. Here, we report the results of ultra-high-resolution
simulation of the formation and evolution of these microhalos. We found that
microhalos have the central density cusp of the form $
ho propto r^{-1.5}$,
much steeper than the cusp of larger dark halos. The very central regions of
these microhalos survive the encounters with stars down to the radius of a few
kpcs from the galactic center. The nearest microhalos at distance of $sim$ 0.1
pc, might be visible as point sources (radius less than 1’), with proper motion
of $sim 0.2$ degree per year. Subhalos are also observable by boosts due to
microhalos. Also, we might be able to use the millisecond pulsar timing
measurements by PPTA to detect microhalos. | | Source: | arXiv, 1006.3392 | | Services: | Forum | Review | PDF | Favorites | |
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