期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 415, 期 1, 页码 L40-L44出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2011.01074.x
关键词
Galaxy: halo; galaxies: abundances; cosmology: theory; dark matter
资金
- NSF [AST-1009973]
- NASA [NNX09AD09G]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009973] Funding Source: National Science Foundation
- NASA [120339, NNX09AD09G] Funding Source: Federal RePORTER
We show that dissipationless Lambda cold dark matter simulations predict that the majority of the most massive subhaloes of the Milky Way are too dense to host any of its bright satellites (L-V > 10(5) L-circle dot). These dark subhaloes have peak circular velocities at infall of V-infall = 30-70 km s(-1) and infall masses of (0.2-4) x 10(10)M(circle dot). Unless the Milky Way is a statistical anomaly, this implies that galaxy formation becomes effectively stochastic at these masses. This is in marked contrast to the well-established monotonic relation between galaxy luminosity and halo circular velocity (or halo mass) for more massive haloes. We show that at least two (and typically four) of these massive dark subhaloes are expected to produce a larger dark matter annihilation flux than Draco. It may be possible to circumvent these conclusions if baryonic feedback in dwarf satellites or different dark matter physics can reduce the central densities of massive subhaloes by order unity on a scale of 0.3-1 kpc.
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