Spectrum Analysis of Lyman Alpha Forest Lines from Hydrodynamical Simulations

Details Spectrum Analysis of Lyman Alpha Forest Lines from Hydrodynamical Simulations Spectrum Analysis of Lyman Alpha Forest Lines from Hydrodynamical Simulations

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.8503z&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #85.03; Bulletin of the American Astronomical Society, Vol. 27, p.1412

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We performed 3-D simulations of Lyalpha clouds in the standard CDM cosmology with a powerful two-level hierarchical hydrodynamic code with fully coupled non-equilibrium evolution for the following chemical species: H, H(+) , He, He(+) , He(++) , and e(-) . The standard spectrum fitting procedure with a careful treatment of line blending is used to extract the statistical properties for the distribution and evolution of Lyalpha forest lines. We obtained the following major results which agree with observational data, especially the new KECK data: the distribution of column densities follows a single power law with exponent beta ~ 1.5 and shows an apparent deficiency of lines above column density ~ 10(15) cm(-2) ; a Gaussian fit to the Doppler parameter distribution yields a median of ~ 25 km s(-1) ; the Doppler parameters shows a lower cutoff which increases slightly with column density; the distribution of equivalent width can be fitted to an exponential with W(* ~ 0.3) and shows a weak overabundance for W<0.2. The evolution of the number of clouds with redshift is slower than most observations found. We also quantitatively demonstrate that a significant number of lower column density lines originate from underdense regions or mini-voids.

Affiliated with

Also associated with

No associations

Rating

Spectrum Analysis of Lyman Alpha Forest Lines from Hydrodynamical Simulations 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 Spectrum Analysis of Lyman Alpha Forest Lines from Hydrodynamical Simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectrum Analysis of Lyman Alpha Forest Lines from Hydrodynamical Simulations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1256085