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- W2899662933 abstract "ABSTRACT We report the discovery of a Milky Way satellite in the constellation of Antlia. The Antlia 2 dwarf galaxy is located behind the Galactic disc at a latitude of b ∼ 11° and spans 1.26°, which corresponds to ∼2.9 kpc at its distance of 130 kpc. While similar in spatial extent to the Large Magellanic Cloud, Antlia 2 is orders of magnitude fainter at MV = −9 mag, making it by far the lowest surface brightness system known (at ∼31.9 mag arcsec−2), ∼100 times more diffuse than the so-called ultra diffuse galaxies. The satellite was identified using a combination of astrometry, photometry, and variability data from Gaia Data Release 2, and its nature confirmed with deep archival DECam imaging, which revealed a conspicuous BHB signal. We have also obtained follow-up spectroscopy using AAOmega on the AAT, identifying 159 member stars, and we used them to measure the dwarf’s systemic velocity, 290.9 ± 0.5 km s−1, its velocity dispersion, 5.7 ± 1.1 km s−1, and mean metallicity, [Fe/H] = −1.4. From these properties we conclude that Antlia 2 inhabits one of the least dense dark matter (DM) haloes probed to date. Dynamical modelling and tidal-disruption simulations suggest that a combination of a cored DM profile and strong tidal stripping may explain the observed properties of this satellite. The origin of this core may be consistent with aggressive feedback, or may even require alternatives to cold dark matter (such as ultra-light bosons)." @default.
- W2899662933 created "2018-11-16" @default.
- W2899662933 creator A5002834237 @default.
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- W2899662933 creator A5060133935 @default.
- W2899662933 creator A5066584997 @default.
- W2899662933 creator A5078152340 @default.
- W2899662933 creator A5078803125 @default.
- W2899662933 date "2019-06-12" @default.
- W2899662933 modified "2023-10-16" @default.
- W2899662933 title "The hidden giant: discovery of an enormous Galactic dwarf satellite in Gaia DR2" @default.
- W2899662933 cites W147232447 @default.
- W2899662933 cites W1481345939 @default.
- W2899662933 cites W1496377183 @default.
- W2899662933 cites W1580369740 @default.
- W2899662933 cites W1587149551 @default.
- W2899662933 cites W1758810109 @default.
- W2899662933 cites W1773813613 @default.
- W2899662933 cites W1816410395 @default.
- W2899662933 cites W1846445696 @default.
- W2899662933 cites W1881527415 @default.
- W2899662933 cites W1917734344 @default.
- W2899662933 cites W1932016673 @default.
- W2899662933 cites W1955780086 @default.
- W2899662933 cites W1966588121 @default.
- W2899662933 cites W1970170972 @default.
- W2899662933 cites W1985933939 @default.
- W2899662933 cites W1994405258 @default.
- W2899662933 cites W2009463540 @default.
- W2899662933 cites W2023559740 @default.
- W2899662933 cites W2027337656 @default.
- W2899662933 cites W2029343094 @default.
- W2899662933 cites W2037341140 @default.
- W2899662933 cites W2039780899 @default.
- W2899662933 cites W2040034517 @default.
- W2899662933 cites W2041604169 @default.
- W2899662933 cites W2044035811 @default.
- W2899662933 cites W2046075055 @default.
- W2899662933 cites W2054103046 @default.
- W2899662933 cites W2055843263 @default.
- W2899662933 cites W2056827990 @default.
- W2899662933 cites W2058804003 @default.
- W2899662933 cites W2067675648 @default.
- W2899662933 cites W2070734907 @default.
- W2899662933 cites W2083034637 @default.
- W2899662933 cites W2087953910 @default.
- W2899662933 cites W2088827965 @default.
- W2899662933 cites W2092618804 @default.
- W2899662933 cites W2094447836 @default.
- W2899662933 cites W2101687185 @default.
- W2899662933 cites W2104654602 @default.
- W2899662933 cites W2104930486 @default.
- W2899662933 cites W2111817932 @default.
- W2899662933 cites W2121480729 @default.
- W2899662933 cites W2131462302 @default.
- W2899662933 cites W2140137154 @default.
- W2899662933 cites W2157805129 @default.
- W2899662933 cites W2158802981 @default.
- W2899662933 cites W2160690168 @default.
- W2899662933 cites W2167277890 @default.
- W2899662933 cites W2170011509 @default.
- W2899662933 cites W2181230108 @default.
- W2899662933 cites W2246786832 @default.
- W2899662933 cites W2278985074 @default.
- W2899662933 cites W2297997173 @default.
- W2899662933 cites W2301571137 @default.
- W2899662933 cites W2405688133 @default.
- W2899662933 cites W2475430430 @default.
- W2899662933 cites W2482569370 @default.
- W2899662933 cites W2485876312 @default.
- W2899662933 cites W2514945585 @default.
- W2899662933 cites W2522000147 @default.
- W2899662933 cites W2523500335 @default.
- W2899662933 cites W2535697027 @default.
- W2899662933 cites W2545031551 @default.
- W2899662933 cites W2554177926 @default.
- W2899662933 cites W2554240634 @default.
- W2899662933 cites W2555496002 @default.
- W2899662933 cites W2564821084 @default.
- W2899662933 cites W2574409480 @default.
- W2899662933 cites W2601671815 @default.
- W2899662933 cites W2609266921 @default.
- W2899662933 cites W2614279747 @default.
- W2899662933 cites W2667748450 @default.
- W2899662933 cites W2754665390 @default.
- W2899662933 cites W2769096779 @default.
- W2899662933 cites W2772189013 @default.
- W2899662933 cites W2785170968 @default.
- W2899662933 cites W2788509621 @default.
- W2899662933 cites W2796925049 @default.
- W2899662933 cites W2797307770 @default.
- W2899662933 cites W2798336535 @default.
- W2899662933 cites W2798474461 @default.