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Title: Implications for the missing low-mass galaxies (satellites) problem from cosmic shear
Author: Jiménez, Raúl (Jiménez Tellado)
Verde, Licia
Kitching, Thomas D.
Keywords: Galàxies
Matèria fosca (Astronomia)
Dark matter (Astronomy)
Issue Date: 6-Jun-2018
Publisher: Royal Astronomical Society
Abstract: The number of observed dwarf galaxies, with dark matter mass ≲1011 M⊙ in the Milky Way or the Andromeda galaxy does not agree with predictions from the successful ΛCDM paradigm. To alleviate this problem, a suppression of dark matter clustering power on very small scales has been conjectured. However, the abundance of dark matter halos outside our immediate neighbourhood (the Local Group) seem to agree with the ΛCDM-expected abundance. Here we connect these problems to observations of weak lensing cosmic shear, pointing out that cosmic shear can make significant statements about the missing satellites problem in a statistical way. As an example and pedagogical application, we use recent constraints on small-scale power suppression from measurements of the CFHTLenS data. We find that, on average, in a region of ∼Gpc3 there is no significant small-scale power suppression. This implies that suppression of small-scale power is not a viable solution to the 'missing satellites problem' or, alternatively, that on average in this volume there is no 'missing satellites problem' for dark matter masses ≳5 × 109 M⊙. Further analysis of current and future weak lensing surveys will probe much smaller scales, k > 10h Mpc−1 corresponding roughly to masses M < 109M⊙.
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It is part of: Monthly Notices of the Royal Astronomical Society: Letters, 2018, vol. 479, num. 1, p. L86-L90
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ISSN: 1745-3933
Appears in Collections:Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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