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Since then, some additional works have cast doubt on the "supervoid" explanation. The correlation between the NVSS dip and the Cold Spot was found to be marginal using a more conservative statistical analysis. [13] Also, a direct survey for galaxies in several one-degree-square fields within the Cold Spot found no evidence for a supervoid. [14]
The Eridanus Supervoid is a large supervoid (an area of the universe devoid of galaxies) discovered as of 2007. At a diameter of about one billion light years it is the second largest known void, superseded only by the Giant Void in Canes Venatici.
Eridanus Void: This void is separated from the Sculptor void by a sheet of galaxies. [11] Eridanus Supervoid (Great Void) 03 h 15 m 05 s −19° 35′ 02″ z=1 150 Mpc The claimed Eridanus Supervoid or "Great Void", reported on 24 August 2007 by the NRAO from Very Large Array Sky Survey data. [12]
Eridanus Supervoid: 489,000,000 (most likely value) A recent analysis of the Wilkinson Microwave Anisotropy Probe (WMAP) in 2007 has found an irregularity of the temperature fluctuation of the cosmic microwave background within the vicinity of the constellation Eridanus with analysis found to be 70 microkelvins cooler than the average CMB ...
Even the hypothesized "Eridanus Supervoid" corresponding to the location of the WMAP cold spot is dwarfed by this void, although the Giant Void does not correspond to any significant cooling to the cosmic microwave background. Inside this vast void there are 17 galaxy clusters, concentrated in a spherically shaped region 50 Mpc in diameter. [1]
It is regarded to be the second largest void ever discovered, slightly larger than the Eridanus Supervoid and smaller than the proposed KBC Void and 1,200 times the volume of expected typical voids. It was discovered in 1988 in a deep-sky survey.
The Eridanus Group, sometimes called the Eridanus Cloud, is a nearby loose grouping of galaxies at a mean distance of approximately 75 Mly (23 ± 2 Mpc) in the constellation Eridanus. [1] Redshift values show that there are approximately 200 galaxies associated with the group, approximately 70% of which are spiral and irregular type galaxies ...
They were able to measure the mass of the black hole. They determined the mass of about 660 million solar-masses with an uncertainty of just 10%. NGC 1332's black hole is the most massive black hole in the Eridanus Cluster, and it is even more massive than NGC 1399's black hole (NGC 1399 is the Fornax cluster's central galaxy). [8]