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Measuring the Spin of Spiral Galaxies
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tonini, Chiara Lapi, Andrea Shankar, Francesco Salucci, Paolo |
| Copyright Year | 2008 |
| Abstract | We compute the angular momentum, the spin parameter and the related distribution function for Dark Matter halos hosting a spiral galaxy. We base on scaling laws, inferred from observations, that link the properties of the galaxy to those of the host halo; we further assume that the Dark Matter has the same total specific angular momentum of the baryons. Our main results are: (i) we find that the gas component of the disk significantly contributes to the total angular momentum of the system; (ii) by adopting for the Dark Matter the observationally supported Burkert profile, we compute the total angular momentum of the disk and its correlation with the rotation velocity; (iii) we find that the distribution function of the spin parameter λ peaks at a value of about 0.03, consistent with a no-major-merger scenario for the late evolution of spiral galaxies. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0510577v2.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | AngularJS Dark Matter Image scaling Inference Population Parameter Spiral model Velocity (software development) |
| Content Type | Text |
| Resource Type | Article |
