Recent observational evidence for steep dwarf galaxy luminosity functions in several rich clusters has led to speculation that their precursors may be the source of the majority of gas and metals inferred from intracluster medium (ICM) X-ray observations. Their deposition into the ICM is presumed to occur through early supernovae-driven winds, the resultant systems reflecting the photometric and chemical properties of the low-luminosity dwarf spheroidals and ellipticals we observe locally. We consider this scenario, utilizing a self-consistent model for spheroidal photochemical evolution and gas ejection via galactic superwinds. Insisting that postwind dwarfs obey the observed color-luminosity-metallicity relations, we conclude that the bulk of the ICM gas and metals does not originate within their precursors.
The Astrophysical Journal
- Pub Date:
- January 1997
- Galaxies: Intergalactic Medium;
- 43 pages, 8 figures, LaTeX, also available at http://msowww.anu.edu.au/~gibson/publications.html, to appear in ApJ, Vol 473, 1997, in press