Ciuca, I;
Kawata, D;
Ando, S;
Calore, F;
Read, JI;
Mateu, C;
(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.
10.1093/mnras/sty1994.
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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.
| Type: | Article |
|---|---|
| Title: | A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty1994 |
| Publisher version: | http://doi.org/10.1093/mnras/sty1994 |
| 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: | catalogues – astrometry – Galaxy: halo – Galaxy: structure – galaxies: dwarf – gamma-rays: general. |
| UCL classification: | UCL 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 Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10063951 |
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