Turbulence Measurements in Two Giant Elliptical Galaxies

Details Turbulence Measurements in Two Giant Elliptical Galaxies Turbulence Measurements in Two Giant Elliptical Galaxies

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011scgg.conf....6d&link_type=abstract

"Structure in Clusters and Groups of Galaxies in the Chandra Era, 2011 Chandra Science Workshop held July 12-14, 2011. Edited by

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Scientific paper

Turbulent pressure is thought to contribute significantly to the total pressure in the hot intra-cluster medium. Due to the limited spectral resolution of current X-ray observatories, it is very difficult to detect turbulence directly from line broadening and quantify this important pressure term. There are, however, other methods to estimate the level of turbulence. We study the effect of resonant scattering on Fe XVII lines in deep XMM-Newton RGS spectra of two giant elliptical galaxies. In the spectra, we find significant differences in Fe XVII line ratios between the galaxies, which are explained by a difference in the level of turbulence. Combined with information from deep Chandra images, we discuss the magnitude differences and the origin of the turbulence in these objects.

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