%0 Generic %1 haslbauer2019ultradiffuse %A Haslbauer, Moritz %A Banik, Indranil %A Kroupa, Pavel %A Grishunin, Konstantin %D 2019 %K tifr %R 10.1093/mnras/stz2270 %T The ultra-diffuse dwarf galaxies NGC 1052-DF2 and 1052-DF4 are in conflict with standard cosmology %U http://arxiv.org/abs/1909.04663 %X Recently van Dokkum et al. (2018b) reported that the galaxy NGC 1052-DF2 (DF2) lacks dark matter if located at $20$ Mpc from Earth. In contrast, DF2 is a dark-matter-dominated dwarf galaxy with a normal globular cluster population if it has a much shorter distance near $10$ Mpc. However, DF2 then has a high peculiar velocity wrt. the cosmic microwave background of $886$ $km\,s^-1$, which differs from that of the Local Group (LG) velocity vector by $1298$ $km\,s^-1$ with an angle of $117 \, ^\circ$. Taking into account the dynamical $M/L$ ratio, the stellar mass, half-light radius, peculiar velocity, motion relative to the LG, and the luminosities of the globular clusters, we show that the probability of finding DF2-like galaxies in the lambda cold dark matter ($Łambda$CDM) TNG100-1 simulation is at most $1.0\times10^-4$ at $11.5$ Mpc and is $4.8\times10^-7$ at $20.0$ Mpc. At $11.5$ Mpc, the peculiar velocity is in significant tension with the TNG100-1, TNG300-1, and Millennium simulations, but occurs naturally in a Milgromian cosmology. At $20.0$ Mpc, the unusual globular cluster population would challenge any cosmological model. Estimating that precise measurements of the internal velocity dispersion, stellar mass, and distance exist for $100$ galaxies, DF2 is in $2.6\sigma$ ($11.5$ Mpc) and $4.1\sigma$ ($20.0$ Mpc) tension with standard cosmology. Adopting the former distance for DF2 and assuming that NGC 1052-DF4 is at $20.0$ Mpc, the existence of both is in tension at $\geq4.8\sigma$ with the $Łambda$CDM model. If both galaxies are at $20.0$ Mpc the $Łambda$CDM cosmology has to be rejected by $\geq5.8\sigma$.

@misc{haslbauer2019ultradiffuse, abstract = {Recently van Dokkum et al. (2018b) reported that the galaxy NGC 1052-DF2 (DF2) lacks dark matter if located at $20$ Mpc from Earth. In contrast, DF2 is a dark-matter-dominated dwarf galaxy with a normal globular cluster population if it has a much shorter distance near $10$ Mpc. However, DF2 then has a high peculiar velocity wrt. the cosmic microwave background of $886$ $\rm{km\,s^{-1}}$, which differs from that of the Local Group (LG) velocity vector by $1298$ $\rm{km\,s^{-1}}$ with an angle of $117 \, ^{\circ}$. Taking into account the dynamical $M/L$ ratio, the stellar mass, half-light radius, peculiar velocity, motion relative to the LG, and the luminosities of the globular clusters, we show that the probability of finding DF2-like galaxies in the lambda cold dark matter ($\Lambda$CDM) TNG100-1 simulation is at most $1.0\times10^{-4}$ at $11.5$ Mpc and is $4.8\times10^{-7}$ at $20.0$ Mpc. At $11.5$ Mpc, the peculiar velocity is in significant tension with the TNG100-1, TNG300-1, and Millennium simulations, but occurs naturally in a Milgromian cosmology. At $20.0$ Mpc, the unusual globular cluster population would challenge any cosmological model. Estimating that precise measurements of the internal velocity dispersion, stellar mass, and distance exist for $100$ galaxies, DF2 is in $2.6\sigma$ ($11.5$ Mpc) and $4.1\sigma$ ($20.0$ Mpc) tension with standard cosmology. Adopting the former distance for DF2 and assuming that NGC 1052-DF4 is at $20.0$ Mpc, the existence of both is in tension at $\geq4.8\sigma$ with the $\Lambda$CDM model. If both galaxies are at $20.0$ Mpc the $\Lambda$CDM cosmology has to be rejected by $\geq5.8\sigma$.}, added-at = {2019-09-12T08:34:50.000+0200}, author = {Haslbauer, Moritz and Banik, Indranil and Kroupa, Pavel and Grishunin, Konstantin}, biburl = {https://www.bibsonomy.org/bibtex/2dd14002112c62e15c5b32622b7178939/citekhatri}, description = {The ultra-diffuse dwarf galaxies NGC 1052-DF2 and 1052-DF4 are in conflict with standard cosmology}, doi = {10.1093/mnras/stz2270}, interhash = {d1b85a85f3062009d7b9c833d2d7d6f3}, intrahash = {dd14002112c62e15c5b32622b7178939}, keywords = {tifr}, note = {cite arxiv:1909.04663Comment: Published in the Monthly Notices of the Royal Astronomical Society, 19 pages, 13 figures, 9 tables}, timestamp = {2019-09-12T08:34:50.000+0200}, title = {The ultra-diffuse dwarf galaxies NGC 1052-DF2 and 1052-DF4 are in conflict with standard cosmology}, url = {http://arxiv.org/abs/1909.04663}, year = 2019 }