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- W2786112105 abstract "Assuming a hydrostatic equilibrium condition in an HI~cloud, we set up and solve the Poisson's equation to calculate the observed HI~structure. We construct an {it iterative} method to estimate the intrinsic velocity dispersion profile (which is not a directly observable quantity) and solve the hydrostatic equilibrium equation. We further use this method to identify if a dark matter halo hosts an HI~cloud or not. Our simulation shows that the presence of a low mass dark matter halo in an HI~cloud can alter the hydrostatic equilibrium significantly such as to introduce an easily detectable change in the surface density profile. We apply our method to Leo-T, a suspected dark galaxy and found that it is hosted by a dark matter halo of mass $sim 8.8 times 10^6$ ms. We also estimated the dark matter halo parameters of Leo-T by solving HI~structure in a large number of pseudo-isothermal halos and comparing the resulting HI~surface density profiles to the observed one. The dark matter halo parameters found to be $rho_0 simeq 0.25$ mspcc~and $r_s simeq 141$ parsec. Our analysis shows that the `mass' of the dark matter halo primarily determines the HI~distribution of a cloud under hydrostatic equilibrium. Our method could be used to identify potential dark galaxies from a population of Compact or Ultra Compact High Velocity Clouds." @default.
- W2786112105 created "2018-02-23" @default.
- W2786112105 creator A5037542656 @default.
- W2786112105 date "2018-02-13" @default.
- W2786112105 modified "2023-09-27" @default.
- W2786112105 title "Looking for dark matter in HVCs/CHVCs: Leo-T a test case" @default.
- W2786112105 hasPublicationYear "2018" @default.
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