A 50 Gpc Hike Through the Ly-alpha Forest

Details A 50 Gpc Hike Through the Ly-alpha Forest A 50 Gpc Hike Through the Ly-alpha Forest

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281...81m&link_type=abstract

The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb

Statistics

Scientific paper

We have compiled a large sample (N~600) of low redshift (z <= 0.3) Ly-alpha absorbers from HST archival data taken with the FOS (G130H) and GHRS (G140L) spectrographs. Comprised of 60 QSO sight lines, this dataset samples roughly 50 Gpc (Delta z ~ 10) of the local Ly-alpha forest. The resulting statistics are a dramatic improvement on what has been previously available for moderate column densities and compliment work being carried out with high resolution, narrow path length spectra that are sensitive to much lower column densities. We find that dN/dz = 35.16 +/- 2.27 for a limiting equivalent width of 0.24A, and dN2/dzdw exceeds an exponential distribution for w < 0.3A. While preliminary results reveal no evidence of clustering, this large sample allows us to address line strength in future investigations. Additionally, low-redshift evolution, cosmic variance, and void statistics will be considered.

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