Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..360f&link_type=abstract
Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe
Astronomy and Astrophysics
Astrophysics
Scientific paper
Using an artificial H I Lyα spectrum we simulate the corresponding He II forest with fixed values of η and a Doppler parameter consisting of a thermal and a turbulent part. In addition metal lines with line strengths and line density as expected in the case of HS 1700+6416 are superimposed. FUSE-like noise is added. The analysis of the simulated spectra in terms of Doppler profiles recovers the input η = N(He II)/N(H I) with a scatter by a factor of 10. About 10 % have significantly lower η-values for various reasons. The majority of the extremely high η-values (up to 1000) are evidently caused by metal lines. We conclude that part of the scatter in η of previous analyses of the He II forest in HE 2347-4342 can be regarded as an artifact. However, we confirm that the correlation between small column densities (in voids) and high η-values is not a methodical artifact and appears to be a true phenomenon.
Fechner Cora
Reimers Dieter
No associations
LandOfFree
The He II Lyman alpha Forest: Evaluation of Simulated Data does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The He II Lyman alpha Forest: Evaluation of Simulated Data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The He II Lyman alpha Forest: Evaluation of Simulated Data will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1860292