2018MNRAS.480.2284C

Query : 2018MNRAS.480.2284C

2018MNRAS.480.2284C - Mon. Not. R. Astron. Soc., 480, 2284-2291 (2018/October-3)

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

CIUCA I., KAWATA D., ANDO S., CALORE F., READ J.I. and MATEU C.

Abstract (from CDS):

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.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): catalogues - astrometry - Galaxy: halo - Galaxy: structure - galaxies: dwarf - gamma-rays: general

CDS comments: Misprints: 3FGL J1924.8+1034 = 3FGL J1924.8-1034, FHES J1501.0+6310 = FHES J1501.0-6310, FHES J1723.5+0501 = FHES J1723.5-0501, FHES J1741.6+3917 = FHES J1741.6-3917.

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Ruprecht 112 OpC 14 57 01.9 -62 33 16           ~ 29 0
2 2FGL J1456.7-6247c gam 14 57 36 -62 49.8           ~ 16 0
3 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
4 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
5 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
6 2FGL J1724.9-0508c BLL 17 24 52.83 -05 06 08.9           ~ 23 0
7 NGC 6366 GlC 17 27 44.24 -05 04 47.5           ~ 344 0
8 Cl Harvard 17 OpC 17 41 20.5 -40 09 24     7.5     ~ 41 0
9 FHES J1741.6-3917 gam 17 41.6 -39 17           ~ 6 0
10 2FGL J1924.9-1036 Bz? 19 24 49.3 -10 35 27           ~ 19 0
11 3FGL J2125.8+5832 gam 21 29 56.2 +58 33 29           ~ 12 0
12 NVSS J220803+651938 Bla 22 08 03.11009378 +65 19 38.7877973       20.6   ~ 45 1
13 2FGL J2212.6+0702 gam 22 12 26.0 +07 08 34           ~ 23 0
14 NGC 7438 OpC 22 57 50.9 +54 23 12           ~ 37 0
15 FHES J2304.0+5406 gam 23 04 02.2716 +54 06 20.201           ~ 4 0

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