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Title:
A Suzaku Observation of the Low-Ionization Fe-Line Emission from RCW 86
Authors:
Ueno, Masaru; Sato, Rie; Kataoka, Jun; Bamba, Aya; Harrus, Ilana; Hiraga, Junko; Hughes, John P.; Kilbourne, Caroline A.; Koyama, Katsuji; Kokubun, Motohide; Nakajima, Hiroshi; Ozaki, Masanobu; Petre, Robert; Takahashi, Tadayuki; Tanaka, Takaaki; Tomida, Hiroshi; Yamaguchi, Hiroya
Affiliation:
AA(Department of Physics, Faculty of Science, Tokyo Institute of Technology, 2-12-1, Meguro-ku, Ohokayama, Tokyo 152-8551; ) AB(Department of Physics, Faculty of Science, Tokyo Institute of Technology, 2-12-1, Meguro-ku, Ohokayama, Tokyo 152-8551) AC(Department of Physics, Faculty of Science, Tokyo Institute of Technology, 2-12-1, Meguro-ku, Ohokayama, Tokyo 152-8551) AD(RIKEN (The Institute for Physics and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198) AE(Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA; NASA/Goddard Space Flight Center, X-ray Astrophysics Laboratory, Code 662, Greenbelt, MD 20771, USA) AF(RIKEN (The Institute for Physics and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198) AG(Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8109, USA) AH(NASA/Goddard Space Flight Center, X-ray Astrophysics Laboratory, Code 662, Greenbelt, MD 20771, USA) AI(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502) AJ(Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033) AK(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502) AL(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AM(NASA/Goddard Space Flight Center, X-ray Astrophysics Laboratory, Code 662, Greenbelt, MD 20771, USA) AN(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AO(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AP(ISS Science Project Team, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505) AQ(Department of Physics, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502)
Publication:
Publications of the Astronomical Society of Japan, Vol.59, No.SP1, pp.171-176 (PASJ Homepage)
Publication Date:
01/2007
Origin:
PASJ
Keywords:
ISM: individual (RCW 86), ISM: supernova remnants, shock waves, X-rays: ISM
Bibliographic Code:
2007PASJ...59S.171U

Abstract

The newly operational X-ray satellite Suzaku observed the southwestern quadrant of the supernova remnant RCW 86 in 2006 February to study the nature of the 6.4keV emission line first detected with the Advanced Satellite for Cosmology and Astronomy (ASCA). The new data confirm the existence of the line, localizing it for the first time; most of the line emission is adjacent and interior to the forward shock, and not at the locus of the continuum hard emission. We also report the first detection of a 7.1keV line, which we interpret as Kβ emission from low-ionization iron. The Fe K line features are consistent with a non-equilibrium plasma of Fe-rich ejecta with net ≲ 109 cm-3 s and kTe ˜ 5 keV. This combination of low net and high kTe suggests collisionless electron heating in an SNR shock. The Fe Kα line shows evidence for intrinsic broadening, with a width of 47 (34-59) eV (99% error region). The difference in the spatial distributions of the hard continuum above 3keV and the Fe K line emission supports a synchrotron origin for the hard continuum.
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