Hercules – Corona Borealis Great Wall

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The Hercules – Corona Borealis Great Wall is a possibly existing cosmic superstructure, believed to be composed of superclusters that form a filament . If it existed, it would be 10 billion light years in size . This would make Hercules-Corona Borealis Great Wall the largest and most massive known structure in the observable universe , ahead of the quasar cluster U1.27 .

position

The hypothetical structure is located in the direction of the eponymous constellations Hercules and Corona Borealis , at a distance of about 10 billion light years, corresponding to the redshift of z  = 1.6 ... 2.1.

At 10 × 7.2 billion light years (3 × 2.2 Gpc ), the Hercules-Corona Borealis Great Wall would have more than double the size of the Huge-LQG discovered in November 2012 and would be six times the size of the Sloan Great Wall .

discovery

Swift Gamma Ray Explorer , whose data led to the discovery of the hypothetical Hercules-Corona Borealis Great Wall .

The region was discovered in November 2013 and was noticed by an unusually high number of gamma-ray bursts, which are an indicator for galaxies. The data basis was provided by the Swift satellite's Gamma Ray research mission to survey the distant universe.

Scale problem

According to the distance and the long time of flight, today's observation shows the temporal state around 10 billion years ago. The fact that such extremely large structures could have existed 3.8 billion years after the Big Bang would, however, contradict the common assumptions about cosmological development. According to the cosmological principle, these assume a relatively homogeneous distribution of matter on large scales, with a maximum possible structure size of 1.2 billion light years.

This would roughly correspond to the Sloan Great Wall, the third largest structure in the known universe. Huge-LQG would already be four times, the Hercules-Corona Borealis Great Wall eight times as big.

However, it cannot be ruled out that these are non-connected structures that happen to have the same redshift.

Individual evidence

  1. ↑ Irene Klotz: Universe's Largest Structure is a Cosmic Conundrum . Discovery News. November 19, 2013. Retrieved December 12, 2013.
  2. ↑ a b Horvath I. Hakkila J., Bagoly Z .: The large largest structure of the Universe, defined by gamma-ray bursts . In: National University of Public Service, Budapest, Hungary . November 5, 2013. arxiv : 1311.1104 . bibcode : 2013arXiv1311.1104H .
  3. ↑ Roger Clowes, Harris, Raghunathan, Campusano, Soechting, Graham, Kathryn A. Harris, Srinivasan Raghunathan, Luis E. Campusano, Ilona K. Söchting and Matthew J. Graham: A structure in the early Universe at z ∼ 1.3 that exceeds the homogeneity scale of the RW concordance cosmology . In: Monthly notices of the royal astronomical society . 1211, No. 4, January 11, 2012, p. 6256. arxiv : 1211.6256 . bibcode : 2012arXiv1211.6256C . doi : 10.1093 / mnras / sts497 . Retrieved December 12, 2013.