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Saraswati: An Extremely Massive ~200 Megaparsec Scale Supercluster

Show simple item record Bagchi, Joydeep en_US SANKHYAYAN, SHISHIR en_US Sarkar, Prakash en_US Raychaudhury, Somak en_US Jacob, Joe en_US Dabhade, Pratik en_US 2019-07-01T05:55:26Z 2019-07-01T05:55:26Z 2017-07 en_US
dc.identifier.citation Astrophysical Journal, 844(1), 25. en_US
dc.identifier.issn 0004-637X en_US
dc.identifier.issn 1538-4357 en_US
dc.identifier.uri en_US
dc.description.abstract Here we report the discovery of an extremely massive and large supercluster (called Saraswati5) found in the Stripe 82 region of SDSS. This supercluster is a major concentration of galaxies and galaxy clusters, forming a wall-like structure spanning at least 200 Mpc across at redshift $z\approx 0.3$. This enormous structure is surrounded by a network of galaxy filaments, clusters, and large, ~40-170 Mpc diameter, voids. The mean density contrast ? (relative to the background matter density of the universe) of Saraswati is gsim1.62 and the main body of the supercluster comprises at least 43 massive galaxy clusters (mean z = 0.28) with a total mass of $\sim 2\times {10}^{16}$ ${M}_{\odot }$. The spherical collapse model suggests that the central region of radius ~20 Mpc and mass at least $4\times {10}^{15}\,{M}_{\odot }$ may be collapsing. This places it among the few largest and most massive superclusters known, comparable to the most massive "Shapley Concentration" ($z\approx 0.046$) in the nearby universe. The Saraswati supercluster and its environs reveal that some extreme large-scale, prominent matter density enhancements formed ~4 Gyr in the past when dark energy had just started to dominate structure formation. This galactic concentration sheds light on the role of dark energy and cosmological initial conditions in supercluster formation, and tests the competing cosmological models. en_US
dc.language.iso en en_US
dc.publisher IOP Publishing en_US
dc.subject Saraswati en_US
dc.subject Extremely Massive en_US
dc.subject Megaparsec Scale en_US
dc.subject Supercluster en_US
dc.subject 2017 en_US
dc.title Saraswati: An Extremely Massive ~200 Megaparsec Scale Supercluster en_US
dc.type Article en_US
dc.contributor.department Dept. of Physics en_US
dc.identifier.sourcetitle Astrophysical Journal en_US
dc.publication.originofpublisher Foreign en_US

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