Discovery of a Protocluster Core Associated with an Enormous Lya Nebula at z = 2.3

Li, Qiong; Wang, Ran; Dannerbauer, Helmut; Cai, Zheng; Emonts, Bjorn; Prochaska, Jason Xavier; Battaia, Fabrizio Arrigoni; Neri, Roberto; Zhang, Chengpeng; Fan, Xiaohui; Jin, Shuowen; Yoon, Ilsang; Bechtel, Shane
Referencia bibliográfica

The Astrophysical Journal

Fecha de publicación:
12
2021
Descripción
The MAMMOTH-1 nebula at z = 2.317 is an enormous Lyα nebula (ELAN) extending to a ~440 kpc scale at the center of the extreme galaxy overdensity BOSS 1441. In this paper, we present observations of the CO(3 - 2) and 250 GHz dust-continuum emission from MAMMOTH-1 using the IRAM NOrthern Extended Millimeter Array. Our observations show that CO(3 - 2) emission in this ELAN has not extended widespread emission into the circum- and inter-galactic media. We also find a remarkable concentration of six massive galaxies in CO(3 - 2) emission in the central ~100 kpc region of the ELAN. Their velocity dispersions suggest a total halo mass of M 200c ~ 1013.1 M ⊙, marking a possible protocluster core associated with the ELAN. The peak position of the CO(3 - 2) line emission from the obscured AGN is consistent with the location of the intensity peak of MAMMOTH-1 in the rest-frame UV band. Its luminosity line ratio between the CO(3 - 2) and CO(1 - 0)r 3,1 is 0.61 ± 0.17. The other five galaxies have CO(3 - 2) luminosities in the range of (2.1-7.1) × 109 K km s-1 pc2, with the star-formation rates derived from the 250 GHz continuum of (<36)-224 M ⊙ yr-1. Follow-up spectroscopic observations will further confirm more member galaxies and improve the accuracy of the halo mass estimation.
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Proto-cúmulo de galaxias
Gas Molecular y Polvo en Galacias através del Tiempo Cósmico

Dos cuestiones fundamentales en la Astrofísica son la conversión de gas molecuar en estrellas y cómo este proceso físico depende del entorno en todas las escalas, desde sistemas planetarios, cúmulos estelares, galaxias hasta cúmulos de galaxias. El objectivo principal de este proyecto es el de estudiar la formación y evolución de galaxias a partir

Helmut
Dannerbauer