The spectral signature of the cooling flow in Abell 478

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Abstract
We present X-ray spectra of Abell 478 taken with the Ginga LAC and with the Einstein SSS. The LAC data set an upper limit of |$\sim 440\,{M}_{\odot}\,\text{yr}^{-1}$| on the mass deposition rate throughout the whole cluster if a value for the galactic absorption based on 21-cm observations of H I is adopted. The SSS data strongly require an absorbing column density well in excess of that expected by scaling from 21-cm observations of galactic H I. Data from the LAC, SSS and HRI taken together imply a mass deposition rate of about |$1000\,{M}_{\odot}\,\text{yr}^{-1}$| with an absorption column density |$\sim 4.8\times{10}^{21}\text{cm}^{-2}.$| The excess absorption may be intrinsic to the cooling flow or due to structure in the interstellar medium of the Galaxy on a scale smaller than the grid of 21-cm observations.

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