MApping the Most Massive Overdensities (MAMMOTH) II -- Discovery of an Extremely Massive Overdensity BOSS1441 at
Sep 9, 201611 pages
Published in:
- Astrophys.J. 839 (2017) 2, 131
- Published: Apr 25, 2017
e-Print:
- 1609.02913 [astro-ph.GA]
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Abstract: (IOP)
Cosmological simulations suggest a strong correlation between high optical-depth Lyα absorbers, which arise from the intergalactic medium, and 3D mass overdensities on scales of 10–30 comoving Mpc. By examining the absorption spectra of ∼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 Lyα absorbers at . 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 Lyα emitters (LAEs) down to and reveal a large-scale structure of LAEs in this field. Our follow-up LBT observations have spectroscopically confirmed 20 galaxies in the density peak. We show that BOSS1441 has an LAE overdensity of 10.8 ± 2.6 on a 15 comoving Mpc scale, which could collapse to a massive cluster with M ≳ 10(15) at . This overdensity is among the most massive large-scale structures at discovered to date.Note:
- 12 pages, 8 figures. submitted to ApJ, Comments are welcome
- galaxies: clusters: general
- galaxies: high-redshift
- intergalactic medium
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