Hi Content Of X-ray Faint Early Type Galaxies And Its Influence On Abundance

Astronomy and Astrophysics – Astronomy

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Scientific paper

There is a growing body of evidence suggesting that field elliptical galaxies have larger HI halos around them, while elliptical galaxies near the centers of clusters have had their HI haloes destroyed. We compared galaxies with comparable low X-ray gas luminosity, some with HI haloes and some lacking HI haloes with Chandra, XMM and Suzaku archived observations. We found that galaxies with HI haloes (e.g. NGC 4278) has a low abundance for hot gas, while galaxies lacking HI haloes (e.g. NGC 4382) have high abundance for hot gas. We therefore interpret the measured very low abundance of X-ray faint galaxies as a result from the dilution of the remaining hot gas by this pristine HI gas.

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