Revealing O vii from stacked X-ray grating spectra of clusters, groups and elliptical galaxies

  title={Revealing O vii from stacked X-ray grating spectra of clusters, groups and elliptical galaxies},
  author={J. Sanders and A. Fabian},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
  • J. Sanders, A. Fabian
  • Published 2010
  • Physics
  • Monthly Notices of the Royal Astronomical Society: Letters
  • We stack 4.6 Ms of high spectral resolution XMM–Newton Reflection Grating Spectrometer spectra from galaxy clusters, groups of galaxies and elliptical galaxies. For those objects with a central temperature of less than 1 keV, we detect O vii for the first time, with a probability of false detection of 2.5 × 10−4. The flux ratio of the O vii to Fe xvii lines is one-fourth to one-eighth of the emission expected for isobaric radiative cooling in the absence of heating. There is either a process… CONTINUE READING

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