The X-ray continuum of Tycho's remnant mearured with GINGA

Details The X-ray continuum of Tycho's remnant mearured with GINGA The X-ray continuum of Tycho's remnant mearured with GINGA

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...283..635f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 283, no. 2, p. 635-641

Statistics

Computation

18

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

Scientific paper

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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