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题名: NIHAO - IV: core creation and destruction in dark matter density profiles across cosmic time
作者: Tollet, Edouard; Maccio, Andrea V.; Dutton, Aaron A.; Stinson, Greg S.; Wang, Liang; Penzo, Camilla; Gutcke, Thales A.; Buck, Tobias; Kang, Xi; Brook, Chris; Di Cintio, Arianna; Keller, Ben W.; Wadsley, James
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2016
卷号: 456, 期号:4, 页码:3542-3552
DOI: 10.1093/mnras/stv2856
英文摘要: We use the NIHAO (Numerical Investigation of Hundred Astrophysical Objects) cosmological simulations to investigate the effects of baryonic physics on the time evolution of dark matter central density profiles. The sample is made of approximate to 70 independent high-resolution hydrodynamical simulations of galaxy formation and covers a wide mass range: 10(10) less than or similar to M-halo/M-circle dot less than or similar to 10(12), i.e. from dwarfs to L-star. We confirm previous results on the dependence of the inner dark matter density slope, alpha, on the ratio between stellar-to-halo mass, M-star/M-halo. We show that this relation holds approximately at all redshifts (with an intrinsic scatter of similar to 0.18 in alpha measured between 1 and 2 per cent of the virial radius). This implies that in practically all haloes the shape of their inner density profile changes quite substantially over cosmic time, as they grow in stellar and total mass. Thus, depending on their final M-star/M-halo ratio, haloes can either form and keep a substantial density core (R-core similar to 1 kpc), or form and then destroy the core and recontract the halo, going back to a cuspy profile, which is even steeper than cold-dark-matter predictions for massive galaxies (10(12) M-circle dot). We show that results from the NIHAO suite are in good agreement with recent observational measurements of a in dwarf galaxies. Overall our results suggest that the notion of a universal density profile for dark matter haloes is no longer valid in the presence of galaxy formation.
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16880
Appears in Collections:星系宇宙学和暗能量研究团组_期刊论文

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