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

Ciucă, Ioana, Kawata, Daisuke, Ando, Shin’ichiro, Calore, Francesca, Read, Justin I and Mateu, Cecilia (2018) A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter Monthly Notices of the Royal Astronomical Society, 480 (2). pp. 2284-2291.

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Abstract

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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Ciucă, Ioana
Kawata, Daisuke
Ando, Shin’ichiro
Calore, Francesca
Read, Justin Ij.read@surrey.ac.uk
Mateu, Cecilia
Date : 25 July 2018
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1093/mnras/sty1994
Copyright Disclaimer : © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Ioana Ciucă, Daisuke Kawata, Shin’ichiro Ando, Francesca Calore, Justin I Read, Cecilia Mateu; A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter, Monthly Notices of the Royal Astronomical Society, Volume 480, Issue 2, 21 October 2018, Pages 2284–2291, https://doi.org/10.1093/mnras/sty1994 is available online at: https://academic.oup.com/mnras/article/480/2/2284/5059594.
Uncontrolled Keywords : Catalogues; Astrometry; Galaxy: halo; Galaxy: structure; Galaxies: dwarf; Gamma-rays: general
Depositing User : Clive Harris
Date Deposited : 20 Sep 2018 14:31
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/849379

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