Other
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004head....8.3603l&link_type=abstract
American Astronomical Society, HEAD meeting #8, #36.03; Bulletin of the American Astronomical Society, Vol. 36, p.1202
Other
Scientific paper
In the solar system, X-ray emission due to charge-transfer (CXE) between neutrals and solar wind high ions is now observed around comets, planetary exospheres and in the interplanetary space through interaction with interstellar neutrals. This production mechanism is extremely efficient and its potential role in other astrophysical contexts involving interfaces between hot plasma and partially neutral gas warrants further investigations.
Charge exchange is known to occur downstream of SNR shock waves, deep enough to produce the population of fast H atoms which is the source of the observed second, broad, H-alpha emission (Chevalier & Raymond, 1978). In absence of strong geometrical effects and filamentary structures the associated charge-transfer emission is marginally significant (Wise & Sarrazin, 1989), although recent XMM spectral properties of SNR's maybe explained by its contribution (Rasmussen et al, 2002).
CXE emission however is potentially relatively more important at interstellar cloud-hot gas discontinuities. We present zero order estimates which suggest that, despite their extremely small thickness (of the order of the atom penetration length in the hot plasma), narrow envelopes around neutral condensations moving through hot gas could produce a non-negligible CXE X-ray emission level, i.e. with respect to the emission of the hot gas itself, in particular in the case of extremely low density ambient hot gas. Observational tests could be performed in order to confirm or reject this suggested contribution to the X-ray diffuse emission. If confirmed, CXE emission could then be responsible for enhanced emission and accelerated hot gas cooling around cool, possibly recently condensed, dense clouds in galaxy clusters, and play a role in the "cooling flow" paradigm.
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