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Early Results from GLASS-JWST. XIV. A Spectroscopically Confirmed Protocluster 650 Million Years after the Big Bang
- Source :
- Morishita , T , Roberts-Borsani , G , Treu , T , Brammer , G , Mason , C A , Trenti , M , Vulcani , B , Wang , X , Acebron , A , Bahe , Y , Bergamini , P , Boyett , K , Bradac , M , Calabro , A , Castellano , M , Chen , W , De Lucia , G , Filippenko , A V , Fontana , A , Glazebrook , K , Grillo , C , Henry , A , Jones , T , Kelly , P L , Koekemoer , A M , Leethochawalit , N , Lu , T-Y , Marchesini , D , Mascia , S , Mercurio , A , Merlin , E , Metha , B , Nanayakkara , T , Nonino , M , Paris , D , Pentericci , L , Rosati , P , Santini , P , Strait , V , Vanzella , E , Windhorst , R A & Xie , L 2023 , ' Early Results from GLASS-JWST. XIV. A Spectroscopically Confirmed Protocluster 650 Million Years after the Big Bang ' , Astrophysical Journal Letters , vol. 947 , no. 2 , 24 .
- Publication Year :
- 2023
-
Abstract
- We present the spectroscopic confirmation of a protocluster at z = 7.88 behind the galaxy cluster Abell 2744 (hereafter A2744-z7p9OD). Using JWST NIRSpec, we find seven galaxies within a projected radius of 60 kpc. Although the galaxies reside in an overdensity around greater than or similar to 20x greater than a random volume, they do not show strong Ly alpha emission. We place 2 sigma upper limits on the rest-frame equivalent width alpha emission, we constrain the volume-averaged neutral fraction of hydrogen in the intergalactic medium to be x (HI) > 0.45 (68% C i). Using an empirical M (UV)-M (halo) relation for individual galaxies, we estimate that the total halo mass of the system is greater than or similar to 4 x 10(11) M (circle dot). Likewise, the line-of-sight velocity dispersion is estimated to be 1100 +/- 200 km s(-1). Using an empirical relation, we estimate the present-day halo mass of A2744-z7p9OD to be similar to 2 x 10(15) M (circle dot), comparable to the Coma cluster. A2744-z7p9OD is the highest redshift spectroscopically confirmed protocluster to date, demonstrating the power of JWST to investigate the connection between dark-matter halo assembly and galaxy formation at very early times with medium-deep observations at
Details
- Database :
- OAIster
- Journal :
- Morishita , T , Roberts-Borsani , G , Treu , T , Brammer , G , Mason , C A , Trenti , M , Vulcani , B , Wang , X , Acebron , A , Bahe , Y , Bergamini , P , Boyett , K , Bradac , M , Calabro , A , Castellano , M , Chen , W , De Lucia , G , Filippenko , A V , Fontana , A , Glazebrook , K , Grillo , C , Henry , A , Jones , T , Kelly , P L , Koekemoer , A M , Leethochawalit , N , Lu , T-Y , Marchesini , D , Mascia , S , Mercurio , A , Merlin , E , Metha , B , Nanayakkara , T , Nonino , M , Paris , D , Pentericci , L , Rosati , P , Santini , P , Strait , V , Vanzella , E , Windhorst , R A & Xie , L 2023 , ' Early Results from GLASS-JWST. XIV. A Spectroscopically Confirmed Protocluster 650 Million Years after the Big Bang ' , Astrophysical Journal Letters , vol. 947 , no. 2 , 24 .
- Notes :
- application/pdf, English
- Publication Type :
- Electronic Resource
- Accession number :
- edsoai.on1382521109
- Document Type :
- Electronic Resource