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Title:
The X-ray continuum of Tycho's remnant mearured with GINGA
Authors:
Fink, H. H.; Asaoka, I.; Brinkmann, W.; Kawai, N.; Koyama, K.
Affiliation:
AA(Max-Planck-Institut fuer Extraterrestrische Physik, Garching, Germany), AB(Max-Planck-Institut fuer Extraterrestrische Physik, Garching, Germany), AC(Max-Planck-Institut fuer Extraterrestrische Physik, Garching, Germany), AD(Max-Planck-Institut fuer Extraterrestrische Physik, Garching, Germany), AE(Kyoto Univ., Sakyo, Kyoto, Japan)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 2, p. 635-641 (A&A Homepage)
Publication Date:
03/1994
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COMPUTATIONAL ASTROPHYSICS, HYDRODYNAMICS, INTERSTELLAR MATTER, LINE SPECTRA, STELLAR ATMOSPHERES, SUPERNOVA REMNANTS, THERMAL EMISSION, X RAY ASTRONOMY, X RAYS, BREMSSTRAHLUNG, EXOSAT SATELLITE, GINGA SATELLITE, IRON COMPOUNDS, MATHEMATICAL MODELS, POTASSIUM COMPOUNDS, STELLAR MODELS
Bibliographic Code:
1994A&A...283..635F

Abstract

The X-ray spectrum of Tycho's remant was observed in the energy range from 2 to 20 keV with Ginga in December, 1989. Fits of standard model spectra to the measured continuum above 4.5 keV showed that the spectrum of the remnant cannot satisfactorily be described by a single Bremsstrahlung component plus a Gaussian line for the Fe K-line blend. Such an approach was previously chosen to characterize Tycho's continuum measured with EXOSAT and Tenma up to 10 keV yielding divergent spectral parameters. Although the two-component modeling of the continuum yielded formally acceptable fits, the spectral parameters of the high energy component remained uncertain according to the very shallow chi2-valleys of the corresponding significance contours. The centroid of the Gaussian line is at 6.5 keV possibly indicating Fe line emssion from a hot plasma. A physical meaningful representation of Tycho's continuum is achieved by a multi-temperature spectrum provided by a numerical model. The 1-D model describes the hydrodynamical evolution of the remnant taking non-equilibrium ionization into account. The remarkable agreement between the model, and the measured continuum confirms the basic model assumption that a local temperature equilibrium between electrons and ions is almost instantaneously established in the remnant's X-ray emitting shell. From the model emissivity and the measured flux density a distance of Tycho of nearly 3 kpc is derived.

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