Hot gas metallicity and the history of supernova activity in elliptical galaxies

Details Hot gas metallicity and the history of supernova activity in elliptical galaxies Hot gas metallicity and the history of supernova activity in elliptical galaxies

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373..445l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, June 1, 1991, p. 445-451. University of California-supported research.

Astronomy and Astrophysics

Astrophysics

49

Elliptical Galaxies, Galactic Evolution, Interstellar Matter, Metallicity, Stellar Mass Ejection, Supernovae, Emission Spectra, Interstellar Gas, Iron, Line Spectra, Red Shift

Scientific paper

Calculations of the dynamical evolution of the hot interstellar medium (ISM) in a massive elliptical galaxy are described, with a variety of past variations of the SN rate being assumed. The investigation focuses on iron enrichment in the ISM. The equivalent widths of the 6.7-keV iron line are calculated as a function of redshift and of galactic projected radius. The present-day interstellar gas in elliptical galaxies contains a fossil record of past SN activity that can be determined from measurements of iron line equivalent widths at several projected radii in the galaxy. It is proposed that the ISM iron abundance is likely to be quite inhomogeneous. The hydrogen-free ejecta of type Ia SN also result in pronounced ISM abundance inhomogeneities that probably eventually cool and move in pressure equilibrium with the local ISM flow velocity. The 6.7-keV iron line emission is greater if the iron is confined to ionized regions of pure iron.

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