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2001MNRAS.327.1145F - Mon. Not. R. Astron. Soc., 327, 1145-1157 (2001/November-2)
Scaling and correlation analysis of galactic images.
FRICK P., BECK R., BERKHUIJSEN E.M. and PATRICKEYEV I.
Abstract (from CDS):
An analysis of the scaling and cross-correlation characteristics of nine optical and radio maps of the nearby spiral galaxy NGC 6946 is presented. The wavelet spectra allow us to separate structures on different scales like spiral arms and diffuse extended emission. Only the images of thermal radio emission and Hα emission give indications of three-dimensional Kolmogorov-type turbulence on the smallest resolved scales (160-800 pc). The cross-correlations between the images of NGC 6946 show strong similarities between the images of total radio emission, red light and mid-infrared dust emission on all scales. The best correlation is found between total radio emission and dust emission. Thermal radio continuum and Hα emission are best correlated on a scale of about 1 arcmin≃1.6 kpc, the typical width of a spiral arm. On a similar scale, the images of polarized radio and Hα emission are anticorrelated, a fact that remains undetected with classical cross-correlation analysis.
Abstract Copyright: The Royal Astronomical Society
Journal keyword(s): turbulence - methods: data analysis - galaxies: individual: NGC 6946 - galaxies: ISM - galaxies: spiral
Simbad objects: 2
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