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 ?
The additional mass of these newly discovered galaxies could help explain the gravitational pull of the Great Attractor.
To further our understanding of the Great Attractor (GA), Dr Woudt and Prof Kraan-Korteweg have been involved in a deep near-infrared survey (with the IRSF in Sutherland) of the Norma Wall of galaxies; a highly obscured large-scale structure central to the Great Attractor, running nearly parallel to the Galactic plane.
But an astronomer now says that a key assumption used in calculating the velocities of elliptical galaxies in the Great Attractor study may harbor a fatal flaw.
The Great Attractor is a central valley in this newly demarcated watershed.
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.
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.
This has enabled Tonry and his colleagues (including Dressler) to cement the case for the Great Attractor and to pinpoint its core.
Centaurus, he adds, may contain part of the Great Attractor.
Known as the Great Attractor, the concentration of mass significantly alters the rate of which these galaxies spread apart as the universe expands.
Alan Dressler's Voyage to the Great Attractor is the story of one of the most interesting discoveries in extragalactic astronomy, written by one of the participants.
They seem part of a large-scale flow toward a distant, vast region of space dubbed the Great Attractor.
In their season, flies like the Daddy longlegs and Coch y Bonddu are great attractors and it is sheer magic to see a huge fish gulp your fly followed by a struggle when you think you're holding a tiger by its tail.