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We have observed seven nearby large angular sized galaxies at 0.33 GHz usingGMRT with angular resolution of $\sim10''$ and sub-mJy sensitivity. Usingarchival higher frequency data at 1.4 or $\sim$6 GHz, we have then determinedtheir spatially resolved non-thermal spectrum. As a general trend, we find thatthe spectral indices are comparatively flat at the galaxy centres and graduallysteepen with increasing galactocentric distances. Using archival far infrared(FIR) MIPS 70 ${\mu} m$ data, we estimate the exponent of radio-FIRcorrelation. One of the galaxy (NGC 4826) was found to have an exponent of thecorrelation of $\sim1.4$. Average exponent from 0.33 GHz data for the rest ofthe galaxies was 0.63$\pm$0.06 and is significantly flatter than the exponent0.78$\pm$0.04 obtained using 1.4 GHz data. This indicates cosmic ray electron(CRe) propagation to have reduced the correlation between FIR and 0.33 GHzradio. Assuming a model of simple isotropic diffusion of CRe, we find that thescenario can explain the frequency dependent cosmic ray electron propagationlength scales for only two galaxies. Invoking streaming instability could,however, explain the results for the majority of the remaining ones.

Low radio frequency observations of seven nearby galaxies with GMRT