Strong Clustering in the Low Redshift Lyman-$\alpha$ Forest

Abstract

The two-point correlation function, $\xi$, of Lyman-alpha forest is found to be large, $\xi =1.8_{-1.2}^{+1.6}$, > 90% confidence level, on the scale of 250-500 km/s for a sample of absorbers (0 < z < 1.3) assembled from HST Key Project Observations. This correlation function is stronger than at high redshift (z > 1.7) where $\xi \approx 0.2$ for velocities > 250 km/s.

20 pages; Latex with 3 figures and 5 tables; Submitted to ApJ

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