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- W3100289096 abstract "We present ASCA X-ray observations of a sample of five groups selected from a cross-correlation of the ROSAT All-Sky Survey with the White et al. optical catalog of groups. These X-ray bright groups significantly increase the number of known systems with temperatures between 2 and 3 keV. They have element abundances of roughly 0.3 times solar that are typical of clusters, but their favored ratio of Si/Fe abundance is lower than the cluster value. Combining the ASCA results with ROSAT imaging data, we calculate total masses of a few to several times 10^13 M_sun, gas mass fractions of ~10%, and baryonic mass fractions of at least 15-20% within a radius of 0.5 Mpc. Upper limits for the ratios of gas to galaxy mass and of the iron mass to galaxy luminosity overlap with the range observed in rich clusters and extend to lower values, but not to such low values as seen in much poorer groups. These results support the idea that groups, unlike clusters, are subject to the loss of their primordial and processed gas, and show that this transition occurs at the mass scale of the 2-3 keV groups. A discussion of ASCA calibration issues and a comparison of ROSAT and ASCA temperatures are included in an Appendix." @default.
- W3100289096 created "2020-11-23" @default.
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- W3100289096 date "1999-05-10" @default.
- W3100289096 modified "2023-09-24" @default.
- W3100289096 title "Mass and Metallicity of Five X‐Ray–bright Galaxy Groups" @default.
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- W3100289096 doi "https://doi.org/10.1086/307147" @default.
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