Discovery and implications of very low metal abundances in NGC 1404 and NGC 4374

Details Discovery and implications of very low metal abundances in NGC 1404 and NGC 4374 Discovery and implications of very low metal abundances in NGC 1404 and NGC 4374

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436l..75l&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 436, no. 1, p. L75-L78

Astronomy and Astrophysics

Astrophysics

73

Absorption Spectra, Abundance, Dark Matter, Elliptical Galaxies, Galactic Evolution, Interstellar Gas, Metallicity, Spectrum Analysis, Galactic Clusters, Metallic Stars, Supernovae, X Ray Spectroscopy

Scientific paper

We present our analysis of ASCA PV phase observations of the elliptical galaxies NGC 1404 and NGC 4374 (M84). The average metallicities in the hot gas derived from the SIS spectra are exceptionally low, Z approximately 0.15 solar, while the temperatures are 'typical,' kT approximately 0.75 keV. We also place upper limits on intrinsic column densities. The low abundances lend support to the theory of Fe enrichment of intracluster media by protogalactic Type II supernova-driven winds and raise the possibility of a fundamental connection between baryon fraction, dissipation, and abundances in elliptical galaxies.

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