Comparison of Large Scale Structure in QSO Absorbers and Galaxies at the Galactic Poles

Details Comparison of Large Scale Structure in QSO Absorbers and Galaxies at the Galactic Poles Comparison of Large Scale Structure in QSO Absorbers and Galaxies at the Galactic Poles

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6007y&link_type=abstract

HST Proposal ID #6007

Computer Science

Hst Proposal Id #6007 Quasars

Scientific paper

Ly-Alpha absorbers in the spectra of QSO's are well studied at z>1.6. They have recently been detected, with HST, in unexpectedly large numbers at low redshifts. Their formation, spatial distribution, and relation to galaxies are still not understood. Whereas at high redshift they appear to be uncorrelated, at low z they show signs of clustering, albeit weaker than galaxies. Current low-z Ly-Alpha forest surveys are rather sparse and noisy, but suggest that the absorbers avoid regions of high galaxy density {e.g. Morris et al. 1993}. If substantiated, this would have major consequences for our picture of structure formation in general. In this proposal we seek definitive statistical answers, with an absorber survey based upon 9 bright QSO's we have identified in fields in which we have deep, well sampled galaxy redshift surveys {North and South Galactic Poles}. This low-z sample, obtainable only with HST, will provide at least an order of magnitude more absorbers in a volume with a large number of overlapping galaxy redshifts, crucial for robust estimates of the clustering. These galaxies have a sharply defined distribution of walls and voids, and even though this regularity is perhaps a statistical `accident', it enables us to perform particularly effective statistical tests to quantify the large scale spatial distribution of the absorbers by themselves and relative to the galaxies. Comparisons with the z>1.6 sample of Ly-Alpha absorbers will be particularly important for understanding evolution of both clustering and number density.

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