https://doi.org/10.1140/epja/i2006-08-051-4
Nuclear Physics in Astrophysics II
Radiative electron capture --A tool to detect He++ in space
The Andrzej Soltan Institute for Nuclear Studies, 05-400, Otwock - Świerk, Poland
* e-mail: danka@ipj.gov.pl
Received:
13
July
2005
Accepted:
20
December
2005
Published online:
23
March
2006
Large clouds of totally ionised helium and hydrogen might exist in the intergalactic space, invisible for the usual optical observations. These clouds, bombarded with medium energy electrons, should generate photon radiation in the X-ray region. The radiation is associated with the Radiative Electron Capture, REC, by He++ ions and should be observable with space born detectors. The photon spectra calculated for a range of temperatures of the electron spectra as well as several column densities of the plasma clouds are discussed.
PACS: 25.40.Lw Radiative capture – / 98.62.Ra Intergalactic matter; quasar absorption and emission-line systems; Lyman forest –
© Società Italiana di Fisica and Springer-Verlag, 2006