The Fe-to-Oxygen Ratio in Early-Type Galaxies with Galactic Winds

Details The Fe-to-Oxygen Ratio in Early-Type Galaxies with Galactic Winds The Fe-to-Oxygen Ratio in Early-Type Galaxies with Galactic Winds

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop...67d&link_type=abstract

XMM-Newton Proposal ID #05019702

Physics

Galaxies, Galactic Surveys, Ngc 4459, Xmm-Newton Proposal 05019702

Scientific paper

We have analyzed archived Chandra data for a sample of 18 low-luminosity early-type galaxies and found that all of the galaxies are gas poor. The ratio of gas mass to stellar mass in these galaxies is ten times less than that found among more luminous galaxies, suggesting the presence of galactic winds in these systems. We find that Type Ia supernovae are energetically favored over AGN as the dominant heating mechanism driving the winds. If these galaxies possess SNIa driven galactic winds, then the Fe abundance of the hot gas should be highly super solar. We propose to observe two of these galaxies (N5866 and N4459) with XMM-Newton to determine the Fe/O ratio of the hot gas (which is a direct measure of the recent SNIa rate) and confirm the SNIa driven galactic wind scenario.

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