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

Abstract

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 $P(U)=A{U}^{\alpha }$, one with $\alpha =-2.5\pm 0.6$ at small length-scales $(600\mathrm{pc}\mathrm{to}1.5\mathrm{kpc})$ and another with $\alpha =-1.0\pm 0.2$ at large length-scales $(1.5\mathrm{kpc}\mathrm{to}10.0\mathrm{kpc})$. 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.

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

References in corpus (3)

• HI velocity dispersion in NGC 1058
• Power spectrum of HI intensity fluctuations in DDO 210
• HI power spectrum of the spiral galaxy NGC628

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