The Two-Point Correlation Function of the Local Lyα Forest

Details The Two-Point Correlation Function of the Local Lyα Forest The Two-Point Correlation Function of the Local Lyα Forest

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.0920p&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #09.20; Bulletin of the American Astronomical Society, Vol. 31, p.1387

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We combine our recent HST/GHRS/G160M results (Penton, Shull, & Stocke, 2000; 15 sightlines) with 13 new HST/STIS low-z (z < 0.07) sightlines to determine the linear two-point correlation function (TPCF, ξ (Δ v)) of the low column density (12.5 <=\ log[N{H I}] <= 14.5) local Lyα forest. Careful accounting of the sensitivity function of each HST spectrum allows us to probe velocity separations (Δ v) as low as 50 km s-1. The new STIS/G140M data roughly doubles the number of existing low-z sightlines, and more importantly increases the pathlength per sightline to establish a better ``baseline" for any potential excess TPCF power at Δ v< 150 km s-1. The new STIS data allows us to check the reality of the ξ (Δ v) < 150 km s-1 3.3 σ excess seen in GHRS data, and to test whether any of the tentative ``features" (1.5-2.5σ ) seen at larger velocity separations (Δ v 850 and 1,700 km s-1; which may be related to the velocity widths of supercluster filaments and voids) are real. This z 0 TPCF will be compared with similar data at z>=2 obtained from ground-based telescopes to determine whether these local, low-column density clouds are plausibly the direct descendents of the high-z Lyα forest. This work is based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract No. NAS5-26555. This research was supported by HST guest observer grant GO-06593.01-95A.

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