Characteristics of Megaparsec-scale Structures in the Horologium-Reticulum Supercluster of Galaxies

Details Characteristics of Megaparsec-scale Structures in the Horologium-Reticulum Supercluster of Galaxies Characteristics of Megaparsec-scale Structures in the Horologium-Reticulum Supercluster of Galaxies

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911303f&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #113.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

We have undertaken a comprehensive spectroscopic survey of the Horologium-Reticulum supercluster (HRS) of galaxies, which includes over 2500 galaxy redshifts in the direction of the intercluster regions. Exclusively, these intercluster redshifts are obtained with the six-degree field (6dF), multi-fiber spectrograph at the Anglo-Australian Observatory. In conjunction with the wide-field, 1.2 m UK Schmidt telescope, 6dF is the ideal supercluster observatory because we are able to obtain coherent information over large areas of the sky, as is the case with a supercluster. Our goal is to resolve the “cosmic web” of filaments, voids, and sheets surrounding the HRS and to examine the interrelationship between them.
Specifically, we find 6 void structures in the HRS region with 10 < RVOID < 15 h-1 Mpc that are completely absent of 6dF galaxies to a scaled radius of R/RVOID < 0.8 for our observational limits (except for a single galaxy in one void). To discover the voids, we implement the GyVe software tool that provides a 3-D, interactive visualization environment. We observe that matter (galaxies and clusters) is not distributed evenly around these voids, but seems to follow a highly ordered arrangement. Volume-normalized, radial profiles of galaxy number counts also indicate the effects of environment and location for each void.
MCF thanks the following institutions/agencies for significant funding during my graduate career: University of North Carolina, NASA North Carolina Space Grant Consortium, Sigma Xi Research Society, the AAS, and the NSF.

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