Great Attractor


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Great Attractor

A large concentration of mass that is detectable only by its powerful gravitational pull on our Galaxy and its Local Supercluster. Redshift surveys in the late 1980s revealed that the peculiar motion of the Local Group relative to the microwave background was not due solely to the gravitational effect of the Virgo cluster, but also to large-scale structure just beyond the Hydra–Centaurus supercluster in the southern sky.

Great Attractor

[¦grāt ə′trak·tər]
(astronomy)
A great supercluster of galaxies and dark matter, approximately 150 × 106 light-years distant, whose existence has been hypothesized to account for the peculiar motions of galaxies, including the Milky Way Galaxy.
References in periodicals archive ?
A Dynamical Analysis of the Most Massive Cluster in the Great Attractor, Monthly Notices of the Royal Astronomical Society, 383, 445-457 Zheng, C.
Optimisation of the NIR Survey Strategy in Unveiling Galaxies in the Great Attractor.
They observed galaxies on the opposite side of the sky from the proposed Great Attractor and found a coherent streaming motion of these galaxies toward the same concentration.
These findings suggest that while the Great Attractor may indeed represent a substantial concentration of mass, a much bigger and more massive source of gravity exists at even greater distances than have been surveyed.
In particular, the maps show that the region near the proposed Great Attractor has about twice the density of other regions.
While in England she participated at the international meeting on the "The Modern Radio Universe: From Planets to Dark Energy" in Manchester in October, and presented colloquia in November at UCL and also at the University Hertfordshire, Centre for Astrophysics Research on "The last secrets of the Great Attractor.
In August 2007, Dr Woudt spent three days at the Astronomy Department at the University of Kyoto (JP) on a working visit to Dr Takahiro Nagayama, as part of a collaborative South African / Japanese research project on mapping the Great Attractor at near-infrared wavelengths.
Centaurus, he adds, may contain part of the Great Attractor.
By almost any measure, the Great Attractor represents the dominant structure in our part of the universe.
Nevertheless, astronomers suspect that features on the scale of the Great Attractor are common in the universe.
This newly discovered concentration of clusters packed with galaxies falls on a line nearly a billion light-years long that also runs through the Great Attractor, the local supercluster (which includes our own galaxy) and another large aggregation known as the Perseus-Pisces supercluster.
Burstein was a member of the international team of astronomers who first identified the large-scale galactic flow toward the Great Attractor (SN: 3/22/86, p.