期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 439, 期 2, 页码 1897-1908出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu070
关键词
galaxies: evolution; galaxies: formation; galaxies: haloes; galaxies: spiral; galaxies: structure
资金
- Foundation Boustany
- Cambridge Overseas Trust
- Isaac Newton Studentship
- NSF [AST 0908370, AST 1211793]
- European Commission [FP7-PEOPLE-2012-CIG 333939]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1211793, 1108977] Funding Source: National Science Foundation
We utilize Young's algorithm to model the adiabatic compression of the dark matter haloes of galaxies in the THINGS survey to determine the relationship between the halo fit to the rotation curve and the corresponding primordial halo prior to compression. Young's algorithm conserves radial action and angular momentum, resulting in less halo compression than more widely utilized approximations. We find that estimates of the parameters of NFW haloes fit to the current dark matter distribution systematically overestimate the concentration and underestimate the virial velocity of the corresponding primordial halo. It is the latter that is predicted by dark matter simulations; so accounting for compression is a necessary step for evaluating whether massive galaxies are consistent with dark matter-only simulations. The inferred primordial haloes broadly follow the c-V-200 relation expected in a Lambda cold dark matter (Lambda CDM) cosmogony, but often scatter to lower concentrations. We are unable to obtain fits at all for those galaxies whose current dark matter haloes are poorly described by the NFW form. We thus find a mixed bag: some galaxies are reasonably well described by adiabatic compression within a primordial NFW halo, while others require an additional mechanism that reduces the density of dark matter below the primordial initial condition.
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