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Updated: May 4, 2026

Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
Spatial correlation between submillimetre and Lyman-alpha galaxies in the SSA 22 protocluster
Yoichi Tamura1, Kotaro Kohno, Kouichiro Nakanishi
1Department of Astronomy, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. yoichi.tamura@nao.ac.jp
Young, low-mass galaxies (Lyman-alpha emitters) and bright submillimetre galaxies show synchronous formation. These star-forming galaxies are found within the same large-scale structure in the early Universe.
Area of Science:
- Cosmic structure formation
- Galaxy evolution
- Early Universe astrophysics
Background:
- Lyman-alpha emitters are young, low-mass galaxies.
- An overdensity of Lyman-alpha emitters in the SSA 22 field traces a filamentary structure at redshift z ≈ 3.1, indicating a forming protocluster.
- Bright submillimetre galaxies are associated with intense star formation and high-redshift radio galaxies.
Purpose of the Study:
- To investigate the association between submillimetre galaxies and large-scale structures traced by Lyman-alpha emitters.
- To determine if submillimetre galaxies are linked to the most significant high-redshift cosmic structures.
Main Methods:
- An imaging survey of 1,100-micrometre emission was conducted in the SSA 22 region.
- Analysis focused on the spatial distribution of submillimetre galaxies relative to the protocluster core and Lyman-alpha emitters.
Main Results:
- An enhancement of submillimetre galaxies was detected near the protocluster core.
- A large-scale correlation was found between submillimetre galaxies and low-mass Lyman-alpha emitters.
- This suggests synchronous formation of these distinct galaxy types within the same structure.
Conclusions:
- Submillimetre galaxies and Lyman-alpha emitters form synchronously within the same large-scale structure at high redshift.
- These findings support current models of cosmic structure formation.
- The study highlights the co-evolution of different galaxy populations in the early Universe.
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