NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T08:25:57 PDT
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For refcode 2013MNRAS.436L..49D:
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Copyright by Royal Astronomical Society. 2013MNRAS.436L..49D The H I column density power spectrum of six nearby spiral galaxies Dutta, Prasun; Bharadwaj, Somnath Abstract. We propose a method to determine the power spectrum of H I column density fluctuations using radio-interferometric observations of 21-cm emission from the interstellar medium of galaxies. We have used this to estimate the power spectra of six nearly face-on nearby spiral galaxies. Earlier work has shown that these power spectra are well fitted by power laws with slopes around -1.6 across length-scales ~1 to ~10 kpc, the amplitude however was undetermined. In this work, we have determined the amplitude of the H I column density power spectrum. We find that the H I column density N_HI_ expressed in units of 10^20^ cm^-2^ has mean square fluctuations in the range ~0.03 to ~20. The amplitude of the power spectrum is found to be tightly correlated with the H I mass fraction of the galaxies. The physical process responsible for these scale-invariant fluctuations is, however, at present not known. Key words: turbulence, Galaxy: disc, galaxies: ISM
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