The density profiles of Dark Matter halos in Spiral Galaxies

Abstract

In spiral galaxies, we explain their non-Keplerian rotation curves (RCs) by means of a non-luminous component embedding their stellar-gaseous disks. Understanding the detailed properties of this component (labelled Dark Matter, DM) is one of the most pressing issues of Cosmology. We investigate the recent relationship (claimed by Walker et al. 2010, hereafter W+10) between $r$, the galaxy radial coordinate, and $V_h(r)$, the dark halo contribution to the circular velocity at $r$, {\it a}) in the framework of the Universal Rotation Curve (URC) paradigm and directly {\it b}) by means of the kinematics of a large sample of DM dominated spirals. We find a general agreement between the W+10 claim, the distribution of DM emerging from the URC and that inferred in the (low luminosity) objects of our sample. We show that such a phenomenology, linking the spiral's luminosity, radii and circular velocities, implies an evident inconsistency with (naive) predictions in the $\Lambda$ Cold Dark Matter ($\Lambda$CDM) scenario.

7 pages, 4 figures. v2: typos corrected, minor rephrasings, Natural Science published version

References in corpus (5)

• The Universal Rotation Curve of Spiral Galaxies. II The Dark Matter Distribution out to the Virial Radius
• Halo expansion in cosmological hydro simulations: towards a baryonic solution of the cusp/core problem in massive spirals
• The Radial Tully-Fisher relation for spiral galaxies I
• The HI Content of Local Late-Type Galaxies
• DMAW 2010 LEGACY the Presentation Review: Dark Matter in Galaxies with its Explanatory Notes

Cited by in corpus (7)

• Self-Interacting Dark Matter from a Non-Abelian Hidden Sector
• Enhanced tidal stripping of satellites in the galactic halo from dark matter self-interactions
• Reliability of Monte Carlo event generators for gamma ray dark matter searches
• Self-Interacting Dark Matter and the Delay of Super-Massive Black Hole Growth
• On galaxy rotation curves from a continuum mechanics approach to modified gravity
• Traversable wormholes and the Brouwer fixed-point theorem
• Effects of non-vanishing dark matter pressure in the Milky Way galaxy