Measuring the spin of spiral galaxies - INSPIRE

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Measuring the spin of spiral galaxies

Chiara Tonini
(
- SISSA, Trieste
)
,
Andrea Lapi
(
- SISSA, Trieste and
- Rome U., Tor Vergata
)
,
Francesco Shankar
(
- SISSA, Trieste
)
,
Paolo Salucci
(
- SISSA, Trieste
)

Oct, 2005

4 pages

Published in:

Astrophys.J.Lett. 638 (2006) L13-L16

e-Print:

astro-ph/0510577 [astro-ph]

DOI:

10.1086/500556

View in:

ADS Abstract Service

reference search32 citations

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Abstract: (arXiv)

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

\lambda

peaks at a value of about 0.03, consistent with a no-major-merger scenario for the late evolution of spiral galaxies.

galaxies: formation
galaxies: halos
galaxies: kinematics and dynamics
galaxies: spiral

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Figures(0)

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(
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,
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)
,
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•
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