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• W3103612110 abstract "Enormous Lyα nebulae (ELANe) represent the extrema of Lyα nebulosities. They have detected extents of >200 kpc in Lyα and Lyα luminosities >1044 erg s−1. The ELAN population is an ideal laboratory to study the interactions between galaxies and the intergalactic/circumgalactic medium (IGM/CGM) given their brightness and sizes. The current sample size of ELANe is still very small, and the few z ≈ 2 ELANe discovered to date are all associated with local overdensities of active galactic nuclei (AGNs). Inspired by these results, we have initiated a survey of ELANe associated with quasi-stellar object (QSO) pairs using the Palomar and Keck Cosmic Web Imagers (PCWI/KCWI). In this Letter, we present our first result: the discovery of ELAN0101+0201 associated with a QSO pair at z = 2.45. Our PCWI discovery data shows that, above a 2σ surface brightness of 1.2 × 10−17 erg s−1 cm−2 arcsec−2, the end-to-end size of ELAN0101+0201 is ≳232 kpc. We have conducted follow-up observations using KCWI, resolving multiple Lyα emitting sources within the rectangular field of view of ≈130 × 165 projected kpc2, and obtaining their emission line profiles at high signal-to-noise ratios (S/Ns). Combining both KCWI and PCWI, our observations confirm that ELAN0101+0201 resides in an extremely overdense environment. Our observations further support that a large amount of cool (T ∼ 104 K) gas could exist in massive halos (M ≳1013 M⊙) at z ≈ 2. Future observations on a larger sample of similar systems will provide statistics of how cool gas is distributed in massive overdensities at high redshift and strongly constrain the evolution of the intracluster medium." @default.
• W3103612110 created "2020-11-23" @default.
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• W3103612110 date "2018-06-26" @default.
• W3103612110 modified "2023-10-17" @default.
• W3103612110 title "Keck/Palomar Cosmic Web Imagers Reveal an Enormous Ly <i>α</i> Nebula in an Extremely Overdense Quasi-stellar Object Pair Field at <i>z</i> = 2.45" @default.
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• W3103612110 doi "https://doi.org/10.3847/2041-8213/aacce6" @default.
• W3103612110 hasPublicationYear "2018" @default.
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