Revista mexicana de astronomía y astrofísica
Print version ISSN 0185-1101
PHILLIPS, J. P. and MARQUEZ-LUGO, R. A. Mid- and Far-Infrared Photometry of Galactic Planetary Nebulae with the AKARI All-Sky Survey. Rev. mex. astron. astrofis [online]. 2011, vol.47, n.1, pp. 83-112. ISSN 0185-1101.
We provide mid- and far-infrared photometry of 857 Galactic planetary nebulae (PNe) using data derived from the AKARI All-Sky Survey. These include fluxes at 9 and 18 µm obtained with the Infrared Camera (IRC), and at 65, 90, 140 and 160 µm using the far-Infrared Surveyor (FIS). It is noted that the IR luminosities of the youngest PNe are comparable to the total luminosities of the central stars, and subsequently decline to where D > 0.08 pc. This is consistent with an evolution of PNe dust opacities, and appreciable absorption in young and proto-PNe. We also note that there is little evidence for the evolution in IR/radio flux ratios suggested by previous authors. The fall-off of dust temperatures with increasing nebular diameter is similar to that determined in previous studies, whilst levels of Lyα heating are <0.5 of the total energy budget of the grains. There appears to be an evolution in the infrared excess (IRE) as nebulae expand, with the largest values occurring in the most compact PNe.
Keywords : dust; extinction; infrared [ISM]; ISM [jets and outflows]; planetary nebulae [general].