The Local Dark Matter Density

By Fabrizio Nesti, P. Salucci. 2012

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We present the recent robust determination of the value of the Dark Matter density at the Sun's location ($\rho_\odot$) with a technique that does not rely on a global mass-modeling of the Galaxy. The method is based on the local equation of centrifugal equilibrium and depends on local and quite well known quantities such as the angular Sun's velocity, the disk to dark contribution to the circular velocity at the Sun, and the thin stellar disk scale length. This determination is independent of the shape of the dark matter density profile, the knowledge of the rotation curve at any radius, and the very uncertain bulge/disk/dark-halo mass decomposition. The result is: $\rho_\odot=0.43 (0.11)(0.10)\,$GeV/cm$^{3}$, where the quoted uncertainties are due to the uncertainty a) in the slope of the circular-velocity at the Sun location and b) in the ratio between this radius and the exponential length scale of the stellar disk. The devised technique is also able to take into account any future improvement in the data relevant for the estimate.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6419616e428cd8b06eb5ce142622fe08746f94d6

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Citations in the corpus

Dark matter direct-detection experiments (2015, background): “6) GeV/cm(3) can be derived (see [144] for a review on this topic).”
Understanding the shape and diversity of dwarf galaxy rotation curves in ΛCDM (2016, background): “This is typically taken as evidence for an exotic missing mass component – most likely a new particle that lies beyond the standard model of particle physics1 (e.g. Jungman et al. 1996; Boyarsky et al. 2009; Bertone 2010; Read 2014).”
Galactic Searches for Dark Matter (2012, background): “…the Galaxy it is safe to neglect this term for plausible potential models of the disk and halo (Kuijken and Gilmore, 1989c), however extending up to approximately 4 kpc above the plane neglecting this term leads to an estimated 15% error in the determination of ρT (R, z) (Bovy and Tremaine, 2012).”
The Milky Way's rotation curve out to 100 kpc and its constraint on the Galactic mass distribution (2016, result): “We adoptΣR0,gas = 17.0M⊙ pc −2 from Read (2014) andΣR0,thick = 7.0M⊙ pc −2 from Flynn et al. (2006).”
Directional detection of dark matter with two-dimensional targets (2016, background): “4 GeV/cm3 is the local DM density [37].”
Lectures on Dark Matter Physics (2016, background): “5–2 overdensity in the local density, however observations may constrain this further [6].”
Galaxy Masses: A Review (2013, result): “These results have been called into question by Bovy & Tremaine (2012) who point out that while the circular speed (= √ −RFR) may indeed be locally flat near the midplane, the mean velocity exhibits a significant lag with respect to the local standard of rest due to asymmetric drift.”
Detecting non-relativistic cosmic neutrinos by capture on tritium: phenomenology and physics potential (2014, background): “3 GeV cm−3 [74], the clustering enhancement factor is: fc ≈ ρDM/m4 n0 ' 7.”
Revisiting constraints on asteroid-mass primordial black holes as dark matter candidates (2019, neutral): “4 GeV/cm3 [128].”
Vertical waves in the solar neighbourhood inGaiaDR2 (2018, background): “Over the past century, ever more detailed measurements of the vertical structure and kinematics of stars has led to increasingly precise determinations of the local mass distribution and dynamics (e.g., Bahcall 1984; Kuijken & Gilmore 1989; Holmberg & Flynn 2000; Bovy & Tremaine 2012).”
Double-Disk Dark Matter (2013, methodology): “A 5◦ inclination of a zd = 100 pc DDDM disk would suppress the local DDDM density by a factor of 10 compared to the normal DM density at the Sun, ρ = 0.3 GeV/cm3.”
Modulation Effects in Dark Matter-Electron Scattering Experiments (2015, background): “4 GeV/cm 3 is the local DM density [25–27].”
New experimental approaches in the search for axion-like particles (2018, methodology): “We can also compare the associated energy density, ρS ' 1 2 m2aa 2 S ∼ 5keV cm3 ( ḡaS 10−19 )2( nS 1025/cm3 )2 ( ma meV )−2 , (4.39) with the putative local DM density ∼ 0.4 GeV/cm3, which is also based on the average ALP amplitude (4.12), and thus constitutes a measure of ALP amplitude generated b”
Sterile neutrino Dark Matter (2018, background): “mponent. 5.2. Direct Detection keV sterile neutrinos (N) cluster in the gravitational potential wells of galactic halos. If neutrinos of mass M account for the entire local DM, ˆ DM ’0:3 0:1 GeV cm 3 [522], then their local number density is given by n N ’(300 100) 103=M(keV)cm 3. This is a factor 1”