MApping the Most Massive Overdensities (MAMMOTH) II -- Discovery of an Extremely Massive Overdensity BOSS1441 at $z=2.32$

Abstract

Cosmological simulations suggest a strong correlation between high optical-depth Ly$\alpha$ absorbers, which arise from the intergalactic medium (IGM), and 3-D mass overdensities on scales of $10-30$ $h^{-1}$ comoving Mpc. By examining the absorption spectra of $\sim$ 80,000 QSO sight-lines over a volume of 0.1 Gpc${}^3$ in the Sloan Digital Sky Survey III (SDSS-III), we have identified an extreme overdensity, BOSS1441, which contains a rare group of strong Ly$\alpha$ absorbers at $z=2.32\pm 0.02$. This absorber group is associated with six QSOs at the same redshift on a 30 comoving Mpc scale. Using Mayall/MOSAIC narrowband and broadband imaging, we detect Ly$\alpha$ emitters (LAEs) down to $0.7\times L_{\mathrm{Ly}\alpha }^{\ast }$, and reveal a large-scale structure of Ly$\alpha$ emitters (LAEs) in this field. Our follow-up Large Binocular Telescope (LBT) observations have spectroscopically confirmed 19 galaxies in the density peak. We show that BOSS1441 has an LAE overdensity of $10.8\pm 2.6$ on a 15 comoving Mpc scale which could collapse to a massive cluster with $M\gtrsim 10^{15}$ M${}_{\odot }$ at $z\sim 0$. This overdensity is among the most massive large-scale structures at $z\sim 2$ discovered to date.

12 pages, 8 figures. submitted to ApJ, Comments are welcome

References in corpus (14)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Multi-Wavelength Constraints on the Cosmic Star Formation History from Spectroscopy: the Rest-Frame UV, H-alpha, and Infrared Luminosity Functions at Redshifts 1.9<z<3.4
• Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
• Protoclusters associated with z > 2 radio galaxies. I. Characteristics of high redshift protoclusters
• Discovery of an Enormous Ly$\alpha$ nebula in a massive galaxy overdensity at $z=2.3$
• The Ubiquity of Coeval Starbursts in Massive Galaxy Cluster Progenitors
• The performance of the blue prime focus Large Binocular Camera at the Large Binocular Telescope
• The Argo Simulation: I. Quenching of Massive Galaxies at High Redshift as a Result of Cosmological Starvation
• Discovery of a Very Large Structure at Z=3.78
• Spectroscopic Confirmation of a Protocluster at z=3.786
• Morphologies of Galaxies in and around a Protocluster at z=2.300
• Lyman-Alpha Emitter Galaxies at z ~ 2.8 in the Extended Chandra Deep Field-South: I. Tracing the Large-Scale Structure via Lyman-Alpha Imaging
• A Glimpse at Quasar Host Galaxy Far-UV Emission, Using DLAs as Natural Coronagraphs

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