21-25 March 2022
Salon de actos del IATA
Europe/Madrid timezone

Dark-matter halo shapes from fits to SPARC galaxy rotation curves

24 Mar 2022, 18:15
Salón de Actos del IATA

Salón de Actos del IATA


Mrs. Adriana Bariego (IFT-UAM)


We fit galactic rotation curves obtained by SPARC from dark matter haloes that are
not spherically symmetric, but allowed to become prolate or oblate with a higher-
multipole density distribution. This is motivated by observing that the flattening of
v(r)=constant is the natural Kepler law due to a filamentary rather than a spherical
source, so that elongating the distribution could bring about a smaller chi squared,
all other things being equal. We compare results with different dark matter profiles
and extract the best fits to the ellipticity computing cosmological simulations of dark
matter haloes.
[1] Bariego Quintana, Adriana; Llanes-Estrada, Felipe and Manzanilla Carretero, Óliver (2021). Dark-
matter prolate halo shapes from fits to SPARC galaxy rotation curves. Proceedings of the EPS-HEP2021
(arXiv:2109.11153 [hep-ph])
[2] Llanes-Estrada, Felipe. Elongated Gravity Sources as an Analytical Limit for Flat Galaxy Rotation
Curves., Universe 7 (2021) 346; 10.13140/RG.2.2.35022.41289.
[3] Allgood et al (2006). The Shape of Dark Matter Halos: Dependence on Mass, Redshift, Radius,
and Formation. Monthly Notices of the Royal Astronomical Society. 367. 1781 - 1796. 10.1111/j.1365-

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