Modelling the Milky Way through adiabatic compression of cold dark matter halo

Details Modelling the Milky Way through adiabatic compression of cold dark matter halo Modelling the Milky Way through adiabatic compression of cold dark matter halo

2005-01-26

arxiv.org/abs/astro-ph/0501567v1

Astronomy and Astrophysics

Astrophysics

13 pages, 10 figures, accepted for publication on Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361:20042035

We use the adiabatic compression theory to build a physically well - motivated Milky Way mass model in agreement with the observational data. The visible mass of the Galaxy is distributed in a spheroidal bulge and a multi - components disc parametrized by three galactic parameters, the Sun distance to the galactic centre, R_0, the total bulge mass, M_{bulge}, and the local disc surface density, \Sigma_{\odot}. To model the dark matter component, we adiabatically compress a Navarro, Frenk and White (NFW) halo (with concentration $c$ and total mass M_{vir}) for fixed values of the spin parameter, \lambda, the fraction of the mass in baryons, $m_b$, and the thin disc contribution to total angular momentum, j_d. An iterative selection procedure is used to explore in very detail the wide space of parameters only selecting those combinations of {R_0, M_{bulge}, \Sigma_{\odot}, \lambda, m_b, j_b, c, M_{vir}} that give rise to a Milky Way model in agreement with the observational constraints. This analysis leads us to conclude that only models with R_0 = 8.5 kpc, $0.8 x 10^{10} M_{\odot} < M_{bulge} < 1.6 x 10^{10} M_{\odot}$ and $49 M_{\odot} pc^{-2} \le \Sigma_{\odot} \le 56 M_{\odot} pc^{-2}$ can be reconciled with the set of observational constraints. As regard the parameters entering the adiabatic compression, we find $0.03 \le \lambda \le 0.10$ and $0.04 \le m_b \le 0.10$, while the final estimates of the parameters describing the initial halo profile turn out to be $5 \stackrel{<}{\sim} c \stackrel{<}{\sim} 12$ and $7 x 10^{11} M_{\odot} \stackrel{<}{\sim} M_\mathrm{vir} \stackrel{<}{\sim} 17 x 10^{11} M_{\odot}$ (all at 95.7% CL).

Affiliated with

Also associated with

No associations

Rating

Modelling the Milky Way through adiabatic compression of cold dark matter halo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Modelling the Milky Way through adiabatic compression of cold dark matter halo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modelling the Milky Way through adiabatic compression of cold dark matter halo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-627150