X-ray spectra of clusters and groups.

Details X-ray spectra of clusters and groups. X-ray spectra of clusters and groups.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..545m&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 545 - 551

Astronomy and Astrophysics

Astrophysics

2

Clusters Of Galaxies: X-Ray Spectra

Scientific paper

Detailed X-ray imaging spectroscopy has come of age with the launch of ROSAT and the ASCA satellite. The high quality spectra allow determination of the abundance of the alpha-burning elements and abundance gradients for low redshift clusters. For high redshift clusters the average metallicity can be well determined out to redshifts >0.5. The early results show that rich clusters show very similar abundances and have an abundance distribution which is very well matched to that produced by Type II supernovae. This has important consequences for the formation and evolution of galaxies and clusters. The situation for poor clusters and groups is more complex with a more solar-like element abundance distribution but with variation from object to object. There is little evidence for variation in cluster Fe abundance with redshift out to z ≡ 0.5. There is also little variation in the log L(x) vs. log kT relation, mass profiles from ASCA and ROSAT data are robust and in good agreement. Out to radii of ≡1 Mpc most isolated, round smooth clusters are isothermal (ignoring the central cooling flow). At larger radii the ASCA data often show that the temperature is dropping at large radii.

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