Lyman-Alpha Clouds in the Very Low-Redshift Universe.

Details Lyman-Alpha Clouds in the Very Low-Redshift Universe. Lyman-Alpha Clouds in the Very Low-Redshift Universe.

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.8502p&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #85.02; Bulletin of the American Astronomical Society, Vol. 30, p.1379

Statistics

Scientific paper

The HST+GHRS combination has given us our first views of Lyalpha absorption systems in the very low-redshift universe (c < 0.07, cz <= 20,000\ km s(-1) ). I will review thesis work in which I recalibrate and examine 15 G160M sightlines from the geocoronal cutoff of 1218 Angstroms to 1300 Angstroms (0.002 < z < 0.07). Together, these sightlines sample 138,000 km s(-1) of the local universe, of which ~ 50% represent pathlength through galaxy voids. I will review the distribution of the detected Lyalpha absorptions in these sightlines in terms of void vs cluster/filament statistics, two-point correlation function along individual sightlines, and nearest galaxy neighbor statistics. I will also discuss the absorption density dN/dz (the number of detected absorbers (N) versus pathlength (z), corrected for a variety of observation effects), as well as the distribution of Lyalpha absorbers in column density (N_H).

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