Not too big, not too small: the dark haloes of the dwarf spheroidals in the Milky Way

Vera-Ciro, Carlos; Helmi, Amina; Starkenburg, Else; Breddels, M. A.

doi:10.1093/mnras/sts148

Cited by 108 publications

(129 citation statements)

References 75 publications

(103 reference statements)

Supporting

Mentioning

118

Contrasting

Order By: Relevance

“…Finally, we note that the slightly lighter dark matter halo estimated here could lessen tension in hierarchical structure formation in the ΛCDM cosmological paradigm imposed by the so-called missing satellite and too big to fail problems (e.g. Springel et al 2008;Vera-Ciro et al 2013).…”

Section: Dark Matter Halomentioning

confidence: 74%

The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution

Huang

Liu

Yuan

et al. 2016

Mon. Not. R. Astron. Soc.

165

179

View full text Add to dashboard Cite

The rotation curve (RC) of the Milky Way out to ∼ 100 kpc has been constructed using ∼ 16, 000 primary red clump giants (PRCGs) in the outer disk selected from the LSS-GAC and the SDSS-III/APOGEE survey, combined with ∼ 5700 halo K giants (HKGs) selected from the SDSS/SEGUE survey. To derive the RC, the PRCG sample of the warm disc population and the HKG sample of halo stellar population are respectively analyzed using a kinematical model allowing for the asymmetric drift corrections and re-analyzed using the spherical Jeans equation along with measurements of the anisotropic parameter β currently available. The typical uncertainties of RC derived from the PRCG and HKG samples are respectively 5-7 km s −1 and several tens km s −1 . We determine a circular velocity at the solar position, V c (R 0 ) = 240 ± 6 km s −1 and an azimuthal peculiar speed of the Sun, V ⊙ = 12.1 ± 7.6 km s −1 , both in good agreement with the previous determinations. The newly constructed RC has a generally flat value of 240 km s −1 within a Galactocentric distance r of 25 kpc and then decreases steadily to 150 km s −1 at r ∼ 100 kpc. On top of this overall trend, the RC exhibits two prominent localized dips, one at r ∼ 11 kpc and another at r ∼ 19 kpc. From the newly constructed RC, combined with other constraints, we have built a parametrized mass model for the Galaxy, yielding a virial mass of the Milky Way's dark matter halo of 0.90 +0.07 −0.08 × 10 12 M ⊙ and a local dark matter density, ρ ⊙,dm = 0.32 +0.02 −0.02 GeV cm −3 .

show abstract

Section: Dark Matter Halomentioning

confidence: 74%

The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution

Huang

Liu

Yuan

et al. 2016

Mon. Not. R. Astron. Soc.

165

179

View full text Add to dashboard Cite

show abstract

“…We note that the Einasto parameter α could vary for different subhaloes (Vera-Ciro et al 2013), and that r max cannot be measured as accurately as V max , especially for lower-mass subhaloes. To see any potential change in the final result due to inaccurate measurements of subhalo profiles, we simply set r max of each subhalo to be 0.5, 1 and 2 times its current value and carry out the same lensing calculations.…”

Section: Subhalo Density Profilesmentioning

confidence: 92%

How well can cold dark matter substructures account for the observed radio flux-ratio anomalies

Xu¹,

Sluse²,

Gao³

et al. 2015

Monthly Notices of the Royal Astronomical Society

121

148

View full text Add to dashboard Cite

Discrepancies between the observed and model-predicted radio flux ratios are seen in a number of quadruply-lensed quasars. The most favoured interpretation of these anomalies is that CDM substructures present in lensing galaxies perturb the lens potentials and alter image magnifications and thus flux ratios. So far no consensus has emerged regarding whether or not the predicted CDM substructure abundance fully accounts for the lensing flux anomaly observations. Accurate modelling relies on a realistic lens sample in terms of both the lens environment and internal structures and substructures. In this paper we construct samples of generalised and specific lens potentials, to which we add (rescaled) subhalo populations from the galaxy-scale Aquarius and the cluster-scale Phoenix simulation suites. We further investigate the lensing effects from subhalos of masses several orders of magnitude below the simulation resolution limit. The resulting flux ratio distributions are compared to the currently best available sample of radio lenses. The observed anomalies in B0128+437, B0712+472 and B1555+375 are more likely to be caused by propagation effects or oversimplified/improper lens modelling, signs of which are already seen in the data. Among the quadruple systems that have closely located image triplets/pairs, the anomalous flux ratios of MG0414+0534 can be reproduced by adding CDM subhalos to its macroscopic lens potential, with a probability of 5% − 20%; for B0712+472, B1422+231, B1555+375 and B2045+265, these probabilities are only of a few percent. We hence find that CDM substructures are unlikely to be the whole reason for radio flux anomalies. We discuss other possible effects that might also be at work.

show abstract

“…Vera-Ciro et al (2012) suggest this problem does not occur if the DM sub-haloes have Einasto rather than NFW density profiles. suggest this problem does not occur if the MW DM halo is less massive than about 2 Â 10 12 M } .…”

Section: Curvature and Homogeneity (1980)mentioning

confidence: 96%

The Dark Matter Crisis: Falsification of the Current Standard Model of Cosmology

Kroupa¹

2012

Publ. – Astron. Soc. Aust

243

275

View full text Add to dashboard Cite

Abstract:The current standard model of cosmology (SMoC) requires The Dual Dwarf Galaxy Theorem to be true according to which two types of dwarf galaxies must exist: primordial dark-matter (DM) dominated (type A) dwarf galaxies, and tidal-dwarf and ram-pressure-dwarf (type B) galaxies void of DM. Type A dwarfs surround the host approximately spherically, while type B dwarfs are typically correlated in phasespace. Type B dwarfs must exist in any cosmological theory in which galaxies interact. Only one type of dwarf galaxy is observed to exist on the baryonic Tully-Fisher plot and in the radius-mass plane. The Milky Way satellite system forms a vast phase-space-correlated structure that includes globular clusters and stellar and gaseous streams. Other galaxies also have phase-space correlated satellite systems. Therefore, The Dual Dwarf Galaxy Theorem is falsified by observation and dynamically relevant cold or warm DM cannot exist. It is shown that the SMoC is incompatible with a large set of other extragalactic observations. Other theoretical solutions to cosmological observations exist. In particular, alone the empirical mass-discrepancyacceleration correlation constitutes convincing evidence that galactic-scale dynamics must be Milgromian. Major problems with inflationary big bang cosmologies remain unresolved.

show abstract

Not too big, not too small: the dark haloes of the dwarf spheroidals in the Milky Way

Cited by 108 publications

References 75 publications

The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution

The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution

How well can cold dark matter substructures account for the observed radio flux-ratio anomalies

The Dark Matter Crisis: Falsification of the Current Standard Model of Cosmology

Contact Info

Product

Resources

About