期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 471, 期 2, 页码 1709-1727出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1710
关键词
galaxies: haloes; Local Group; dark matter; cosmology: theory
资金
- NASA - Chandra X-ray Center [PF5-160136]
- Moore Center for Theoretical Cosmology and Physics at Caltech
- NASA from STScI [HST-GO-14734]
- NSF [AST-1518291, 1411920, AST-1412153, AST-1009973, AST-1412836, AST-1517491]
- NASA through HST - Space Telescope Science Institute (STScI) under NASA [AR-13921, AR-13888, AR-14282.001, NAS5-26555]
- Alfred P. Sloan Research Fellowship
- NASA ATP [NNX14AH35G, 12-APT12-0183]
- CAREER [1455342]
- National Science Foundation [AST-1517226]
- NASA through HST - STScI [AR-13888, AR-12836, AR-13896, AR-14282]
- Research Corporation for Science Advancement
- Simons Foundation
- David and Lucile Packard Foundation
- NASA [NNX15AB22G, NAS8-03060]
- NSF MRI [PHY-0960291]
- Extreme Science and Engineering Discovery Environment (XSEDE) - NSF [TG-AST130039]
- NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1518291, 1412153] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1517226] Funding Source: National Science Foundation
Among the most important goals in cosmology is detecting and quantifying small (M-halo similar or equal to 10(6-9) M-circle dot) dark matter (DM) subhaloes. Current probes around the Milky Way (MW) are most sensitive to such substructure within similar to 20 kpc of the halo centre, where the galaxy contributes significantly to the potential. We explore the effects of baryons on subhalo populations in Lambda CDM using cosmological zoom-in baryonic simulations of MW-mass haloes from the Latte simulation suite, part of the Feedback In Realistic Environments (FIRE) project. Specifically, we compare simulations of the same two haloes run using (1) DM-only (DMO), (2) full baryonic physics and (3) DM with an embedded disc potential grown to match the FIRE simulation. Relative to baryonic simulations, DMO simulations contain similar to 2 x as many subhaloes within 100 kpc of the halo centre; this excess is greater than or similar to 5 x within 25 kpc. At z = 0, the baryonic simulations are completely devoid of subhaloes down to 3 x 10(6) M-circle dot within 15 kpc of the MW-mass galaxy, and fewer than 20 surviving subhaloes have orbital pericentres <20 kpc. Despite the complexities of baryonic physics, the simple addition of an embedded central disc potential to DMO simulations reproduces this subhalo depletion, including trends with radius, remarkably well. Thus, the additional tidal field from the central galaxy is the primary cause of subhalo depletion. Subhaloes on radial orbits that pass close to the central galaxy are preferentially destroyed, causing the surviving population to have tangentially biased orbits compared to DMO predictions. Our method of embedding a potential in DMO simulations provides a fast and accurate alternative to full baryonic simulations, thus enabling suites of cosmological simulations that can provide accurate and statistical predictions of substructure populations.
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