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We aim at carrying out a comprehensive study of the nearby composite AGN-SBgalaxy, NGC 4945, using spectroscopic and photometric data from the Herschelsatellite. In particular, we want to characterize the thermal structure in thisgalaxy by a multi-transitions analysis of the spatial distribution of the 12^COemission at different spatial scales using HIFI, PACS, SPIRE as well as APEXdata. We combined the 12^CO/IR flux ratios and the LTE analysis of the 12^COimages to derive the thermal structure of the Interstellar Medium (ISM) forspatial scales raging from <200 pc to 2 kpc. From the 12^CO analysis we foundclear trend in the distribution of the derived temperatures and the 12^CO/IRratios. It is remarkable that at intermediate scales (360 pc-1 kpc) we seelarge temperatures in the direction of the X-ray outflow while at smallerscales (<200 pc-360 pc), the highest temperature, derived from the high-Jlines, is not found toward the nucleus, but toward the galaxy plane. Thethermal structure derived from the 12CO multi-transition analysis suggests thatmechanical heating, like shocks or turbulence, dominates the heating of the ISMin the nucleus of NGC 4945 located beyond 100 pc from the center of the galaxy.This result is further supported by the Kazandjian et al. 2015 models, whichare able to reproduce the emission observed at high-J (PACS) 12^CO transitionswhen mechanical heating mechanisms are included. Shocks and/or turbulence arelikely produced by the barred potential and the outflow, observed in X-rays.

The multi-phase ISM in the nearby composite AGN-SB galaxy NGC 4945: large (parsecs) scale mechanical heating