X-Ray Spectrum of a Peculiar Supernova Remnant, G359.1-0.5

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Author(s)

Abstract

We present Suzaku results of a supernova remnant (SNR), G 359.1−0.5, in the direction of the Galactic center region. From the SNR, we have found prominent K-shell lines of highly ionized Si and S ions, together with unusual structures at 2.5–3.0 and 3.1–3.6 keV. No canonical SNR plasma model, in either ionization equilibrium or under-ionization, can explain the structures. The energies and shapes of the structures are similar to those of the radiative transitions of free electrons to the K-shell of He-like Si and S ions (radiative recombination continuum: RRC). The presence of strong RRC structures indicates that the plasma is in over-ionization. In fact, the observed spectrum has been well-fitted with an over-ionized plasma model. The best-fit electron temperature of 0.29 keV is far smaller than the ionization temperature of 0.77 keV, which means that G 359.1−0.5 is in an extreme condition of over-ionization. We report some cautions on the physical parameters, and comment about possible origins for the over-ionized plasma.

Journal

  • Publications of the Astronomical Society of Japan

    Publications of the Astronomical Society of Japan 63(3), 527-533, 2011-06-25

    Oxford University Press

References:  38

Codes

  • NII Article ID (NAID)
    10029037606
  • NII NACSIS-CAT ID (NCID)
    AA1082896X
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00046264
  • NDL Article ID
    11126372
  • NDL Source Classification
    ZM33(科学技術--宇宙科学)
  • NDL Call No.
    Z53-A296
  • Data Source
    CJP  NDL  IR 
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