Dutta, Prasun ; Begum, Ayesha ; Bharadwaj, Somnath ; Chengalur, Jayaram N. (2009) The scaleheight of NGC 1058 measured from its HI power spectrum Monthly Notices of the Royal Astronomical Society: Letters, 397 (1). L60-L63. ISSN 1745-3925
Full text not available from this repository.
Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1745-...
Related URL: http://dx.doi.org/10.1111/j.1745-3933.2009.00684.x
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) =AUα, one with α=−2.5 ± 0.6 at small length-scales (600 pc to 1.5 kpc) and another with α=−1.0 ± 0.2 at large length-scales (1.5-10.0 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 disc at large length-scales. We use the observed break in the power spectrum to estimate the galaxy's scaleheight, which we find to be 490 ± 90 pc.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to John Wiley and Sons. |
| Keywords: | Turbulence; Galaxy: Disc; Galaxies: ISM |
| ID Code: | 63559 |
| Deposited On: | 29 Sep 2011 04:10 |
| Last Modified: | 29 Sep 2011 04:10 |
Repository Staff Only: item control page
