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Title:
Measuring the Broad-Band X-Ray Spectrum from 400eV to 40keV in the Southwest Part of the Supernova Remnant RXJ1713.7‑3946
Authors:
Takahashi, Tadayuki; Tanaka, Takaaki; Uchiyama, Yasunobu; Hiraga, Junko S.; Nakazawa, Kazuhiro; Watanabe, Shin; Bamba, Aya; Hughes, John P.; Katagiri, Hideaki; Kataoka, Jun; Kokubun, Motohide; Koyama, Katsuji; Mori, Koji; Petre, Robert; Takahashi, Hiromitsu; Tsuboi, Yoko
Affiliation:
AA(Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510 ; Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033) AB(Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510 ; Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94025, USA) AC(Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AD(Cosmic Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198) AE(Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033) AF(Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510; Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033) AG(Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AH(Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019, USA) AI(Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526) AJ(Department of Physics, Tokyo Institute of Technology, Ohokayama, Meguro-ku, Tokyo 152-8551) AK(Department of High Energy Astrophysics, Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510) AL(Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502) AM(Department of Applied Physics, University of Miyazaki, 1-1 Gakuen Kibana-dai, Nishi Miyazaki, Miyazaki 889-2192) AN(Astrophysics Science Division, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA) AO(Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526) AP(Department of Physics, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551)
Publication:
Publications of the Astronomical Society of Japan, Vol.60, No.SP1, pp.S131--S140 (PASJ Homepage)
Publication Date:
01/2008
Origin:
PASJ
Keywords:
acceleration of particles --- ISM: individual (RXJ1713.7-3946) --- ISM: supernova remnants --- X-rays: ISM
Bibliographic Code:
2008PASJ...60S.131T

Abstract

We report on results from Suzaku broadband X-ray observations of the southwest part of the galactic supernova remnant (SNR) RXJ1713.7-3946 with an energy coverage of 0.4-40keV. The X-ray spectrum, presumably of synchrotron origin, is known to be completely lineless, making this SNR ideally suited for a detailed study of the X-ray spectral shape formed through efficient particle acceleration at high-speed shocks. With a sensitive hard X-ray measurement from the HXD PIN aboard Suzaku, we determined the hard X-ray spectrum in the 12-40keV range to be described by a power law with photon index of Γ = 3.2±0.2, significantly steeper than the soft X-ray index of Γ = 2.4±0.05 measured previously with ASCA and other missions. We find that a simple power law fails to describe the full spectral range of 0.4-40keV, and instead a power-law with an exponential cutoff with a hard index of Γ = 1.50±0.09 and a high-energy cutoff of ɛc = 1.2±0.3keV formally provides an excellent fit over the full bandpass. If we use the so-called SRCUT model, as an alternative model, it gives a best-fit rolloff energy of ɛroll = 0.95±0.04keV. Together with the TeV γ-ray spectrum, ranging from 0.3 to 100TeV, recently obtained by HESS observations, our Suzaku observations of RXJ1713.7-3946 provide stringent constraints on the highest-energy particles accelerated in a supernova shock.
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