Other
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008atnf.prop.1527b&link_type=abstract
ATNF proposal P593, Semester: April, 2008
Other
Extragalactic, Parkes
Scientific paper
Multiple independent lines of evidence demonstrate that the surface area subtended by atomic hydrogen at column densities near 10^17 cm^-2 exceeds that seen at 10^19 cm^-2 by about a factor of 30. Intervening column densities are rarely encountered because of ionization in the intergalactic radiation field. Although at the limits of current technology to detect, deep integrations with the Parkes Multi-Beam system can reach the required sensitivity to image such gas in the local universe. This HI ``Cosmic Web'' is likely to be in the form of filaments and other diffuse structures in the vicinity of massive galaxies, although only a single confirmed example has been imaged to date. In view of the long dynamical timescales, these features retain essentially a Hubble-time's worth of interaction and feed-back history. We propose to carry out the first systematic study of these features; explicitly targeting the extended (~1.3x1.3Mpc) environment of the most massive galaxies within 20 Mpc. Our initial request is aimed at optimizing the observing strategy, so a small sub-set of our target fields will be probed with several observing strategies.
Barnes David
Bland-Hawthorn Joss
Braun Robert
Koribalski Baerbel
Lopez-Sanchez Angel R.
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