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    How well do we know the halo mass function?

    Access Status
    Open access via publisher
    Authors
    Murray, Steven
    Power, C.
    Robotham, A.
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Murray, S. and Power, C. and Robotham, A. 2013. How well do we know the halo mass function?. Monthly Notices of the Royal Astronomical Society: Letters. 434 (1).
    Source Title
    Monthly Notices of the Royal Astronomical Society: Letters
    DOI
    10.1093/mnrasl/slt079
    ISSN
    1745-3925
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/56177
    Collection
    • Curtin Research Publications
    Abstract

    The parameters governing the standard d cold dark matter cosmological model have been constrained with unprecedented accuracy by precise measurements of the cosmic microwave background by the Wilkinson Microwave Anisotropy Probe (WMAP) and Planck satellites. Each new data release has refined further our knowledge of quantities - such as the matter density parameter O M - that are imprinted on the dark matter halo mass function (HMF), a powerful probe of dark matter and dark energy models. In this Letter, we trace how changes in the cosmological parameters over the last decade have influenced uncertainty in our knowledge of the HMF. We show that this uncertainty has reduced significantly since the third WMAP data release, but the rate of this reduction is slowing. This is limited by uncertainty in the normalization s8, whose influence is most pronounced at the high-mass end of the mass function. Interestingly, we find that the accuracy with which we can constrain the HMF in terms of the cosmological parameters has now reached the point at which it is comparable to the scatter in HMF fitting functions. This suggests that the power of the HMF as a precision probe of dark matter and dark energy hinges on more accurate determination of the theoretical HMF. Finally, we assess prospects of using the HMF to differentiate between cold and warm dark matter models based on ongoing improvements in measurements of O M , and we comment briefly on optimal survey strategies for constraining dark matter and dark energy models using the HMF. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

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