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Science with Minisat 01 pp 163–176Cite as

Modeling the Local Interstellar Medium

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Abstract

The state of our observational and theoretical knowledge of the local interstellar medium (LISM) is reviewed. The LISM stretches out from the local Cloud, surrounding the solar system to the boundary of the Local Bubble, which is a region of distinct anticorrelation between HI (N H < 1020 cm−2) and 1/4 keV diffuse soft X-rays. After discussing some key observations in soft X-rays, obtained by ROSAT and DXS, and in the EUV by the EUVE satellite and the EURD instrument onboard Minisat, I will critically review models of the LISM. Since we cannot determine the plasma state (temperature, density, etc.) directly, the best plasma diagnostic tool is high resolution spectroscopy. The interpretation of the data then has to rely heavily on plasma emission models. I will point out several caveats in the standard procedure. Preference is given to dynamical models of the Local Bubble in general and to non-equilibrium plasma emission models in particular, which have to be calculated self-consistently. Such a model can explain (i) the deficiency of EUV lines as observed by EUVE, (ii) the dispersion measure and scintillation properties of a nearby pulsar, (iii) the existence of local neutral HI clouds, and (iv) OVI absorption line widths. New model spectra of the LISM will be presented and briefly compared with DXS, EUVE and preliminary EURD results.

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Authors and Affiliations

  1. Max-Planck-Institut für Extraterrestrische Physik, Postfach 1603, D-85740, Garching, Germany

    Dieter Breitschwerdt (Heisenberg Fellow)

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  1. Dieter Breitschwerdt
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Editors and Affiliations

  1. LAEFF, INTA, Madrid, Spain

    Alvaro Gimenez

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© 2001 Springer Science+Business Media New York

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Breitschwerdt, D. (2001). Modeling the Local Interstellar Medium. In: Gimenez, A. (eds) Science with Minisat 01. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0686-6_17

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  • DOI: https://doi.org/10.1007/978-94-010-0686-6_17

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-3814-0

  • Online ISBN: 978-94-010-0686-6

  • eBook Packages: Springer Book Archive

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