Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-02
Astronomy and Astrophysics
Astrophysics
14 pages with 4 figures, AAS Latex, accepted to ApJL
Scientific paper
10.1086/310939
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 Mg to Si abundance ratio is $\sim 1$ solar. Assuming that the abundance ratios among $\alpha$-elements are the same with the solar ratios, spectral fit with increased systematic error in the 0.4--1.6 keV range gives abundances of $\alpha$-elements and Fe to be both $\sim$ 1 solar by taking one solar of Fe to be 3.24$\times 10^{-5}$ by number. These new abundance results solve 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 $\sim 1$ solar within $4'$, and decreases outerwards down to $0.2\sim 0.3$ solar at $10'$ from the galaxy center. Dilution due to an extended hot gas is suggested.
Makishima Kazuo.
Matsushita Kyoko
Ohashi Takaya
Rokutanda Etsuko
Yamasaki Noriko Y.
No associations
LandOfFree
New Measurement of Metal Abundance in the Elliptical Galaxy NGC 4636 with Asca does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New Measurement of Metal Abundance in the Elliptical Galaxy NGC 4636 with Asca, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Measurement of Metal Abundance in the Elliptical Galaxy NGC 4636 with Asca will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-468186