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Title:
New Measurement of Metal Abundance in the Elliptical Galaxy NGC 4636 with ASCA
Authors:
Matsushita, Kyoko; Makishima, Kazuo; Rokutanda, Etsuko; Yamasaki, Noriko Y.; Ohashi, Takaya
Publication:
Astrophysical Journal Letters v.488, p.L125 (ApJL Homepage)
Publication Date:
10/1997
Origin:
APJ
ApJ Keywords:
GALAXY: ABUNDANCE, GALAXIES: INDIVIDUAL (NGC 4636), X-RAYS: GALAXIES
DOI:
10.1086/310939
Bibliographic Code:
1997ApJ...488L.125M

Abstract

High-quality X-ray spectra of NGC 4636 are obtained with ASCA. Theoretical models are found unable to reproduce the data in the Fe-L line region. Spectral data above 1.4 keV indicate that the Mg to Si abundance ratio is ~1 solar. Assuming that the abundance ratios among alpha elements are the same as the solar ratios, a spectral fit with increased systematic error in the 0.4--1.6 keV range gives abundances of alpha elements and Fe to be both ~1 solar by taking 1 solar of Fe to be 3.24x10^{-5} by number. These new abundance results solve the discrepancy between stellar and hot-gas metallicity, but still a low supernova rate is implied. We also detect strong abundance gradients for both alpha elements and iron in a similar fashion. The abundance is ~1 solar within 4' and decreases outward down to 0.2--0.3 solar at 10' from the galaxy center. Dilution due to an extended hot gas is suggested.
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