Universality of galactic surface densities within one dark halo scale-length

Details Universality of galactic surface densities within one dark halo scale-length Universality of galactic surface densities within one dark halo scale-length

2009-09-28

arxiv.org/abs/0909.5203v1

Nature, vol. 461, 627-628 (2009)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted as a Letter to Nature

Scientific paper

It was recently discovered that the mean dark matter surface density within one dark halo scale length - the radius within which the volume density profile of dark matter remains approximately flat - is constant across a wide range of galaxies. This scaling relation holds for galaxies spanning a luminosity range of 14 magnitudes and the whole Hubble sequence. Here we report that the luminous matter surface density is also constant within one scale length of the dark halo. This means that the gravitational acceleration generated by the luminous component in galaxies is always the same at this radius. Although the total luminous-to-dark matter ratio is not constant, within one halo scale length it is constant. Our finding can be interpreted as a close correlation between the enclosed surface densities of luminous and dark matter in galaxies.

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