Computer Science
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11519g&link_type=abstract
HST Proposal ID #11519. Cycle 17
Computer Science
Scientific paper
This is a program to observe several targets behind the Great Wall {GW}, a typical galaxy filament in the Universe. The approach is to observe a series of targets in one area of sky to perform a ``cosmic tomography'' in a 10 Mpc^2 region which includes sightlines through regions of varying galaxy density from no galaxies within 3 Mpc of the sight line to a dozen or more galaxies within 3 Mpc of the sight line. The Sloan Digital Sky Survey {SDSS} plus various CfA redshift surveys are nearly complete at Great Wall distances to 0.1-0.25L*, making the available galaxy survey material sufficient for this study. This program will address several science drivers, including probing the typical covering factor of warm, photoionized gas in galaxy filaments and the metallicity of such gas and how far it is spread from large and small galaxies. Preliminary studies suggest such material extends 800 kpc from the nearest L* galaxy {even if that galaxy is not the source of the gas} and 250 kpc from the nearest 0.1L* galaxy. {H0 assumed to be 70 km/s/Mpc};
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