Milky Way mass constraints from the Galactic satellite gap

Cautun, Marius; Frenk, Carlos S.; Weygaert, Rien van de; Hellwing, Wojciech A.; Jones, Bernard J. T.

doi:10.1093/mnras/stu1849

Cited by 68 publications

(74 citation statements)

References 71 publications

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“…The green and blue dotted lines in Fig. 4 respectively indicate where N sub = 60 is realized for M halo = 10 12 M /h and M halo = 3 · 10 12 M /h; these values for the MW halo mass roughly correspond to the current observational limits [63,64]. For M halo = 10 12 M /h, even with the pure CDM case the satellite number is as low as N sub = 94, indicating that the missing satellite problem itself is ameliorated if the MW halo mass takes a value close to its lower bound.…”

Section: Implications For the Number Of Milky Way Satellitessupporting

confidence: 73%

Lyman- α constraints on ultralight scalar dark matter: Implications for the early and late universe

et al. 2017

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We investigate constraints on scalar dark matter (DM) by analyzing the Lyman-α forest, which probes structure formation at medium and small scales, and also by studying its cosmological consequences at high and low redshift. For scalar DM that constitutes more than 30% of the total DM density, we obtain a lower limit m 10 −21 eV for the mass of scalar DM. This implies an upper limit on the initial field displacement (or the decay constant for an axion-like field) of φ 10 16 GeV. We also derive limits on the energy scale of cosmic inflation and establish an upper bound on the tensor-to-scalar ratio of r < 10 −3 in the presence of scalar DM. Furthermore, we show that there is very little room for ultralight scalar DM to solve the "small-scale crisis" of cold DM without spoiling the Lyman-α forest results. The constraints presented in this paper can be used for testing generic theories that contain light scalar fields.

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Section: Implications For the Number Of Milky Way Satellitessupporting

confidence: 73%

Lyman- α constraints on ultralight scalar dark matter: Implications for the early and late universe

et al. 2017

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“…Such a lower chance is also observationally supported (Liu et al 2011). Thus the occurrence of the Magellanic Clouds and avoidance of more than three subhaloes with Vmax > 25km/s together can put a strong constraints on the MW mass (Cautun et al 2014).…”

Section: Introductionmentioning

confidence: 58%

“…Cautun et al (2014) found that the probability of having such a wide gap in velocity space is about 1% in the CDM model. Jiang & van den Bosch (2016) find the probability is even lower as 0.1% using a monte-carlo method.…”

Section: Introductionmentioning

confidence: 96%

The gap of stellar mass in galaxy groups: another perspective of the too-big-to-fail problem in the Milky Way

Kang

Wang

Luo

2016

Mon. Not. R. Astron. Soc.

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The Milky Way presents the too-big-to-fail (TBTF) problem that there are two observed satellite galaxies with maximum circular velocity larger than 55km/s, and others have velocity less than 25km/s, but the cold dark matter model predicts there should be more than 10 subhaloes with velocity larger than 25km/s. Those massive subhaloes with 25km/s < V max < 55km/s should not have failed to form stars. The TBTF problem severely challenges the CDM model. Most efforts are seeking the effects of baryonic feedback, decreasing the mass of the Milky Way, changing the properties of dark matter, so as to assign the observed low-velocity satellites into the massive subhaloes found in simulations. However, the TBTF problem can be avoided if the MW have not accreted subhaloes with velocity between 25km/s < V max < 55km/s although the probability of such a gap is lower as ∼ 1% and can not be tested against observations. In this work we study the gap in stellar mass of satellite galaxies using the SDSS group catalogue and a semi-analytical model. We find that there are 1-2% of galaxy groups with a large gap in the stellar mass of their satellites. These 'big gap' groups have accreted less massive subhaloes in their formation history and naturally display a gap between their satellite galaxies. If extrapolating our results to the Milky Way is appropriate, we conclude that it is very likely that our Milky Way has not accreted enough massive subhaloes to host those low-velocity satellites, and the TBTF problem is naturally avoided.

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“…For CDM the EvoFb model slightly overpredicts the number of the faintest satellites (MV > −8), but here the data could be incomplete. However, since the number of satellites scales with the host halo mass (Wang et al 2012;Cautun et al 2014), our sterile neutrino models would be increasingly in conflict with the observed luminosity functions for M host halo 10 12 M . For example, if M host halo 7 × 10 11 M , both the L6 = 700 and L6 = 12 EvoFb models would be ruled out because they fail to form enough faint satellites with MV > −10 even after accounting for the large scatter.…”

Section: Satellites Of the Milky Waymentioning

confidence: 86%

Reionization in sterile neutrino cosmologies

Bose¹,

Frenk²,

Hou³

et al. 2016

Mon. Not. R. Astron. Soc.

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. ABSTRACTWe investigate the process of reionisation in a model in which the dark matter is a warm elementary particle such as a sterile neutrino. We focus on models that are consistent with the dark matter decay interpretation of the recently detected line at 3.5 keV in the X-ray spectra of galaxies and clusters. In warm dark matter models the primordial spectrum of density perturbations has a cut-off on the scale of dwarf galaxies. Structure formation therefore begins later than in the standard cold dark matter (CDM) model and very few objects form below the cut-off mass scale. To calculate the number of ionising photons, we use the Durham semianalytic model of galaxy formation, GALFORM. We find that even the most extreme 7 keV sterile neutrino we consider is able to reionise the Universe early enough to be compatible with the bounds on the epoch of reionisation from Planck. This, perhaps surprising, result arises from the rapid build-up of high redshift galaxies in the sterile neutrino models which is also reflected in a faster evolution of their far-UV luminosity function between 10 > z > 7 than in CDM. The dominant sources of ionising photons are systematically more massive in the sterile neutrino models than in CDM. As a consistency check on the models, we calculate the present-day luminosity function of satellites of Milky Way-like galaxies. When the satellites recently discovered in the DES survey are taken into account, strong constraints are placed on viable sterile neutrino models.

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Milky Way mass constraints from the Galactic satellite gap

Cited by 68 publications

References 71 publications

Lyman- α constraints on ultralight scalar dark matter: Implications for the early and late universe

Lyman- α constraints on ultralight scalar dark matter: Implications for the early and late universe

The gap of stellar mass in galaxy groups: another perspective of the too-big-to-fail problem in the Milky Way

Reionization in sterile neutrino cosmologies

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