The Scale Height of NGC 1058 Measured from its HI Power Spectrum

Details The Scale Height of NGC 1058 Measured from its HI Power Spectrum The Scale Height of NGC 1058 Measured from its HI Power Spectrum

2009-05-10

arxiv.org/abs/0905.1450v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted for publication in Mon. Not. of Royal Astron. Soc. Letters

Scientific paper

We have measured the HI power spectrum of the nearly face-on spiral galaxy NGC 1058 from radio-interferometric observations using a visibility based estimator. The power spectrum is well fitted by two different power laws $P(U)=AU^{\alpha}$, one with $\alpha =- 2.5\pm 0.6$ at small length-scales $(600 {\rm pc} {\rm to} 1.5 {\rm kpc})$ and another with $\alpha =- 1.0\pm 0.2$ at large length-scales $(1.5 {\rm kpc} {\rm to} 10.0 {\rm kpc})$. We interpret this change in the slope of the power spectrum as a transition from 3D turbulence at small length-scales to 2D turbulence in the plane of the galaxy's disk at large length-scales. We use the observed break in the power spectrum to estimate the galaxy's scale-height, which we find to be $ 490 \pm 90 $ pc.

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