the Metal Abundance of X-ray Faint Early-Type Galaxies: Effects of Dilution?

Details the Metal Abundance of X-ray Faint Early-Type Galaxies: Effects of Dilution? the Metal Abundance of X-ray Faint Early-Type Galaxies: Effects of Dilution?

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..150s&link_type=abstract

XMM-Newton Proposal ID #06736001

Physics

Galaxies, Galactic Surveys, Ngc 3608

Scientific paper

The metallicity of hot gas in E/S0 galaxies is known to vary widely, in the sense that galaxies with only small amounts of hot gas often have very low hot gas metallicities. One solution is that what little hot gas X-ray faint systems have has been diluted by pristine hydrogen gas in the vicinity of the galaxy. There is a growing body of evidence suggesting that some early-type galaxies harbor sizable large-scale HI halos, presumably left over from the epoch of galaxy formation. If this pristine HI is accreted, the existing hot gas in the galaxy will be diluted. We propose to test this by measuring the metallicities of a sample of X-ray faint galaxies with a range of HI-to-hot gas ratios. If the dilution hypothesis is correct, galaxies with more HI will have lower hot gas metallicities.

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