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Implications for the Missing Low-mass Galaxies (Satellites) Problem From Cosmic Shear

Jimenez, R; Verde, L; Kitching, TD; (2018) Implications for the Missing Low-mass Galaxies (Satellites) Problem From Cosmic Shear. Monthly Notices of the Royal Astronomical Society: Letters , 479 (1) L86-L90. 10.1093/mnrasl/sly101. Green open access

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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⊙.

Type: Article
Title: Implications for the Missing Low-mass Galaxies (Satellites) Problem From Cosmic Shear
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnrasl/sly101
Publisher version: https://doi.org/10.1093/mnrasl/sly101
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Gravitational lensing: weak, cosmological parameters
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10059431
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