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  Flat spectrum X-ray emission from the direction of a molecular cloud associated with SNR RX J1713.7-3946

Uchiyama, Y., Takahashi, T., & Aharonian, F. A. (2002). Flat spectrum X-ray emission from the direction of a molecular cloud associated with SNR RX J1713.7-3946. Publications of the Astronomical Society of Japan, 54(5), L73-L77.

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 Creators:
Uchiyama, Y.1, Author
Takahashi, T.1, Author
Aharonian, F. A.2, Author           
Affiliations:
1Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan, ou_persistent22              
2Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              

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Free keywords: acceleration of particles; ISM : cosmic rays; ISM : supernova remnants; radiation mechanisms : non-thermal; X-rays : individual (RX J1713.7-3946)
 Abstract: We report on the discovery of a diffuse X-ray source with ASCA, presumably associated with a molecular cloud in the vicinity of the supernova remnant RX J1713.7-3946. The energy spectrum (1- 10keV) of the hard X-ray source shows a flat continuum, which is described by a power-law with a photon index of Gamma =(+0.4)(-0.3). We argue that this unusually flat spectrum can be best interpreted in terms of characteristic bremsstrahlung emission from the loss-flattened distribution of either sub- relativistic protons or mildly relativistic electrons. The strong shock of RX J1713.7-3946, which is likely to interact with the molecular cloud, as evidenced by CO-line observations, seems to be a natural site of acceleration of such nonthermal particles. The observed luminosity of Lx = 1.7 x 10(35) erg s(- 1) (for a distance of 6 kpc) seems to require a huge kinetic energy of about 10(50) erg in the form of nonthermal particles to illuminate the cloud. The shock-acceleration at RX J1713.7- 3946 can barely satisfy this energetic requirement, unless (i) the source is located much closer than the preferred distance of 6 kpc and/or (ii) the mechanical energy of the supernova explosion essentially exceeds 10(51) erg. Another possibility would be that an essential part of the lost energy due to the ionization and heating of gas, is somehow converted to plasma waves, which return this energy to nonthermal particles through their turbulent reacceleration on the plasma waves.

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Language(s): eng - English
 Dates: 2002
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 28894
ISI: 000178970100002
 Degree: -

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Title: Publications of the Astronomical Society of Japan
  Alternative Title : Publ. Astron. Soc. Jpn.
Source Genre: Journal
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Publ. Info: -
Pages: - Volume / Issue: 54 (5) Sequence Number: - Start / End Page: L73 - L77 Identifier: ISSN: 0004-6264