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Solving the Mysteries in Hot ISM in Early-Type Galaxies

Published online by Cambridge University Press:  25 May 2016

K. Matsushita ,
T. Ohashi  and
K. Makishima
K. Matsushita
Affiliation:
Dept. of Phys., Tokyo Metropolitan Univ. 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-03, Japan
T. Ohashi
Affiliation:
Dept. of Phys., Tokyo Metropolitan Univ. 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-03, Japan
K. Makishima
Affiliation:
Dept. of Phys., University of Tokyo 7-3-1, Hongo, Bunkyoku, Tokyo 113, Japan

Extract

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We have analyzed ASCA data of about 30 early type galaxies, and studied their X-ray emitting ISM (InterStellar Medium) properties. Our study has been motivated by the apparently very low metallicity of the ISM, which cannot easily be reconciled with theoretical predictions. By carefully examining the abundance ratios and uncertainties in the Fe-L complex, we have concluded that the ISM abundances in X-ray luminous galaxies are in fact about 1 solar. Therefore, the severe discrepancy between the ISM and stellar abundance has been relaxed. The ISM metallicity of X-ray fainter galaxies are uncertain, but at least SNe Ia contribution to the ISM abundance is smaller than in the X-ray luminous ones.

Type
Session 1: Plasma and Fresh Nucleosynthesis Phenomena
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 283
Copyright
Copyright © Kluwer 1998 

References

Matsushita, K., 1997, , Google Scholar
Matsushita, K. et al. 1997, ApJL, 488, L125 Google Scholar
Matsushita, K. et al. 1997, submitted to Nature Google Scholar