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A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter
Journal article   Open access   Peer reviewed

A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter

Ioana Ciucă, Daisuke Kawata, Shin’ichiro Ando, Francesca Calore, Justin I Read and Cecilia Mateu
Monthly Notices of the Royal Astronomical Society, Vol.480(2), pp.2284-2291
25/07/2018

Abstract

Catalogues; Astrometry; Galaxy: halo; Galaxy: structure; Galaxies: dwarf; Gamma-rays: general
We make the first attempt to find dwarf galaxies in eight Fermi-LAT extended, unassociated, source fields using Gaia DR2. After probing previously unexplored heliocentric distances of d ˂ 20 kpc with an extreme-deconvolution (XD) technique, we find no sign of a dwarf galaxy in any of these fields despite Gaia's excellent astrometric accuracy. Our detection limits are estimated by applying the XD method to mock data, obtaining a conservative limit on the stellar mass of M* ˂ 104 M☉ for d ˂ 20 kpc. Such a low stellar mass implies either a low-mass subhalo or a massive stripped-down subhalo. We use an analytic model for stripped subhaloes to argue that, given the sizes and fluxes of the Fermi-LAT sources, we can reject the hypothesis that they owe to dark matter annihilation.
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https://doi.org/10.1093/mnras/sty1994View
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