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Energy sources for X-ray cluster emission

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>15/03/1979
Number of pages2
Pages (from-to)235-236
Publication StatusPublished
<mark>Original language</mark>English


SOME galactic clusters are strong X-ray emitters1, and we here the problem of establishing certain models for the source of this radiation. In the first model we suppose that the X rays are thermal bremsstrahlung from a hot quasi-isothermal inter-cluster gas. Typical parameters for the temperature, particle density and total mass of the gas are2 T ~ 3 × 108 K, n ~ 10−3, M ~ 3 × 1044 kg. If we assume3 relative nuclei solar abundances, then the thermal energy contained in the gas is E T ~ 2 × 1064 erg. This is ~10% of the total rest mass energy of a 1011 M circle dot galaxy and clearly poses a problem for potential energy sources.