A Dusty X-Ray Absorber in the Perseus Cluster?

We have analyzed 0.35-7.5 keV X-ray spectra of the center of the Perseus Cluster collected using the Broad Band X-Ray Telescope (BBXRT) on the Astro-1 mission. These spectra are particularly useful for examining the nature of the X-ray absorber in cooling flows because of BBXRT's sensitivity between 0.35 and 1.0 keV. We confirm that there is X-ray absorption above that expected from gas in our own Galaxy. Furthermore, the absorbing medium is deficient in helium. However, the energy of the oxygen K edge is consistent with neutral material (at the redshift of the cluster), yet is not consistent with any ionized state of oxygen. It is not possible to completely ionize helium and have oxygen neutral, so the apparent helium deficiency cannot be due to ionization. We propose that the X-ray absorption is due to dust grains that have condensed out of a medium in which helium remains ionized. This model satisfies all the observational constraints, but it is difficult to understand theoretically.