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Title:
ASCA Observation of the Supernova Remnant W49B
Authors:
Fujimoto, Ryuichi; Tanaka, Yasuo; Inoue, Hajime; Ishida, Manabu; Itoh, Masayuki; Mitsuda, Kazuhisa; Sonobe, Takashi; Tsunemi, Hiroshi; Murakami, Hiroyuki; Koyama, Katsuji; Hayashi, Ichizo; Ikeda, Kazuaki; Rasmussen, Andy; Ricker, George; Becker, Christopher M.
Affiliation:
AA(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AB(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AC(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AD(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AE(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AF(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AG(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AH(Institute of Space and Astronautical Science, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229), AI(Department of Earth Science, Faculty of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560), AJ(Department of Earth Science, Faculty of Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560), AK(Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-01), AL(Department of Physics, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya 464-01), AM(Department of Physics, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya 464-01), AN(Department of Physics, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya 464-01), AO(Center for Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A)
Publication:
Publ. of the Astronomical Society of Japan, v.47, p.L31-L35. (PASJ Homepage)
Publication Date:
10/1995
Origin:
PASJ; KNUDSEN
PASJ Keywords:
ISM: INDIVIDUAL (W49B), SHOCK WAVES, SUPERNOVAE, SUPERNOVA REMNANTS, X-RAYS: SOURCES, X-RAYS: SPECTRA
Bibliographic Code:
1995PASJ...47L..31F

Abstract

The supernova remnant W49B with a center-filled X-ray morphology was observed with the Japanese X-ray satellite ASCA, and a spectrum of unprecedented quality was obtained with the X-ray CCD cameras on board. The observed spectrum is consistent with entirely thermal emission, and individual K emission lines from highly ionized atoms of Si, S, Ar, Ca, and Fe are clearly resolved. It cannot, however, be reproduced by a single plasma component, even if non-equilibrium ionization is introduced, and requires multiple plasma components. The images constructed with photons of the Si-, S-, and Fe-lines, respectively, indicate that iron ions are mostly confined to the inner part of the remnant, and that those of the lower-Z elements form an outer envelope. This feature is interpreted as being due to a stratified distribution of elements.

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