The origin of the far-infrared emission from the nearby radio galaxy M87 remains a matter of debate. Some studies find evidence of a far-infrared excess due to thermal dust emission, whereas others propose that the far-infrared emission can be explained by synchrotron emission without the need for an additional dust emission component. We observed M87 with PACS and SPIRE as part of the Herschel Virgo Cluster Survey (HeViCS). We compare the new Herschel data with a synchrotron model based on infrared, submm and radio data to investigate the origin of the far-infrared emission. We find that both the integrated SED and the Herschel surface brightness maps are adequately explained by synchrotron emission. At odds with previous claims, we find no evidence of a diffuse dust component in M87.

We measured the SCUBA fluxes of a sample of Seyfert 1, Seyfert 2, starburst and normal disc galaxies, taken from the Extended 12 Micron Galaxy Sample. From these data, we determine the entire dust content and temperature distribution of galaxies of different classes through a Planckian inversion technique.

The modclling of plasma outfiows from central gravitatingobjects such as AGN is bricfly discussed via analytic examples in thecontext of ideal MHD. The exact solutions are produced via a nonlinearseparation of the variables in the full set of the MHD equations. Attentionis given to the questions of initial acceleration and collimationof the outflow. A quantitative: criterion is provided for the transition ofthe morphologies from highly collimated jets to non collimated winds.