The broad-line radio galaxy story

In this paper I discuss the issue of the so-called 25 micron-peakers, which were discovered with IRAS, and consist almost solely of broad-line radio galaxies. I find that this peak is caused by the absence of colder dust that emits at 60 micron and not by an excess of hot dust, as suggested by the name. On optical images, the 25 micron-peakers show a lack of extended dust. The peakers are consistent with being in a later evolutionary stage, in which all the extended dust has been formed into stars and the dust torus is smaller. If the 60 micron dust is heated by stars, there might be a correlation between the star-formation rate and the power of the AGN.