Dutta, Prasun ; Begum, Ayesha ; Bharadwaj, Somnath ; Chengalur, Jayaram N. (2013) Probing interstellar turbulence in spiral galaxies using H i power spectrum analysis New Astronomy, 19 . pp. 89-98. ISSN 1384-1076
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Official URL: http://doi.org/10.1016/j.newast.2012.08.008
Related URL: http://dx.doi.org/10.1016/j.newast.2012.08.008
Abstract
We estimate the H i intensity fluctuation power spectrum for a sample of 18 spiral galaxies chosen from THINGS. Our analysis spans a large range of length-scales from ∼300 pc to ∼16 kpc across the entire galaxy sample. We find that the power spectrum of each galaxy can be well fitted by a power law , with an index that varies from galaxy to galaxy. For some of the galaxies the scale-invariant power-law power spectrum extends to length-scales that are comparable to the size of the galaxy’s disk. The distribution of is strongly peaked with 50% of the values in the range to 1.5, and a mean and standard deviation of −1.3 and 0.5 respectively. We find no significant correlation between and the star formation rate, dynamical mass, H i mass or velocity dispersion of the galaxies.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier B.V. |
| Keywords: | Physical Data And Process: Turbulencegalaxy: Discgalaxies: ISM. |
| ID Code: | 116353 |
| Deposited On: | 09 Apr 2021 04:50 |
| Last Modified: | 09 Apr 2021 04:50 |
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