The following document lists the file abstract/JBRAINE_PROP_1.abs
from catalogue VI/111.
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We propose to search for dust emission toward a representative sample of galaxy clusters with cooling flows. The reason for selecting clusters with reported cooling flows is that these are where a neutral intergalactic medium should be present, if the cooling flow interpretation is correct. Our goal is to detect the dust so we propose observations with the ISOPHOT PHT-C at 160 microns. Not only does this wavelength correspond well with the expected temperatures but is also the most sensitive available. These sources have been selected for their proximity and reported mass inflow rate in order to provide the most sensitive test possible. All of the proposed sources have already been observed by us in CO(1-0) and CO(2-1). HI observations have also been published for all of these sources. Our goal is to determine whether the reddening due to intergalactic but intracluster dust reported by, in particular, Hu et al. (1992) is real. The proposed observations can answer this question with no ambiguity. The dust temperature MUST fall within a range observable with the 160 micron filter. The issue of reddening is very important for studies of galaxies in the cluster environment because it would create a systematic color gradient along the line of sight through the intracluster material. These observations also provide a test for cooling flow models with dust. It has been suggested that the non-detections of molecules in cooling flows (ALL except NGC 1275) could be due to the molecules condensing onto dust grains. If so, we should clearly detect this dust.