Comparing Simulations and Observations of the Lyalpha Forest

Details Comparing Simulations and Observations of the Lyalpha Forest Comparing Simulations and Observations of the Lyalpha Forest

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.2308d&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #23.08; Bulletin of the American Astronomical Society, Vol. 28, p.856

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We reanalyze the artificial spectra generated in the Hernquist, et al (1996) CDM hydro simulations of the Lyman alpha forest using Voigt profiles fitting, and find substantial differences in the resulting statistical properties of Lyalpha forest absorbers. The semi-automated analysis algorithm adds noise to artificial spectra to emulate HIRES data, fits a continuum in IRAF, identifies lines as > 5sigma fluctuations, deconvolves blended lines into individual Voigt profiles, and uses a chi (2) -minimization routine to find the best-fit values for N_HI and b. This algorithm is intended to be applicable to both real and artifical data, and is intended to emulate the manner in which QSO spectra are generally analyzed. In contrast, the algorithm in Hernquist, et al (1996) used a flux threshold algorithm to identify lines, and performed no deblending. The resulting distributions of N_HI and b-parameters are in significantly better agreement with Keck HIRES results. The sensitivity of the results to the analysis method indicates that artificial spectra must be analyzed in a very similar manner to real spectra when comparing model predictions to data.

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