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- W3100141356 abstract "We report on the discovery of a new correlation between global parameters of the hot interstellar gas in elliptical galaxies. We reanalyze archival Chandra data for 30 normal early-type systems, removing the contributions of resolved and unresolved point sources to reveal the X-ray morphology of the hot gas. We determine the half-light radius, RX, and the mean surface brightness, IX, from the gas surface brightness profiles. A spectral analysis determines the temperature, TX, of the gas within 3 optical effective radii. We find that the galaxies lie on an X-ray gas fundamental plane (XGFP) of the form TX ∝ RI. This is close to, but distinct from, a simple luminosity-temperature relation. The intrinsic width of the XGFP is only 0.07 dex, nearly identical to that of the stellar (optical) fundamental plane (SFP). This is surprising since X-ray gas masses are typically ~10-2 of the stellar masses. We show that the XGFP is not a simple consequence of the virial theorem or hydrostatic equilibrium and that it is essentially independent of the SFP. The XGFP thus represents a genuinely new constraint on the hydrodynamical evolution of elliptical galaxies." @default.
- W3100141356 created "2020-11-23" @default.
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- W3100141356 date "2005-10-19" @default.
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- W3100141356 title "A Fundamental Plane Relation for the X-Ray Gas in Normal Elliptical Galaxies" @default.
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- W3100141356 doi "https://doi.org/10.1086/498135" @default.
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