The LISM: Progress Report on Observations and Modelling

Author(s)

D. Breitschwerdt, M. Avillez, M. J. Freyberg, P. Mendes, J. Alves

Abstract

The LISM consists of the Local Cloud surrounding the solar system, and

on a larger scale of the Local Bubble (LB), an X-ray emitting cavity of

about 100 pc radius. Both exert a substantial influence on the

heliosphere, by keeping it under pressure, as well as injecting

particles. Here we will report on recent progress in observations,

mainly in soft X-rays, with XMM-Newton, which provide strong constraints

on LB models. The latter include non-equilibrium ionization, as well as

most recent 3D high resolution simulations on parallel processors. We

are able to follow the evolution of the LB in conjunction with the

neighbouring Loop I superbubble, assuming a multi-supernova origin, and

reproduce the morphology of the LB, as well as X-ray spectral features

and OVI column densities. Still existing discrepancies between data and

models will be discussed in detail.

Organisation(s)

Department of Astrophysics

Journal

COSPAR Scientific Assembly

Volume

Pages

3937

Publication date

2004

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