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A 3D Spheroid Model as a More Physiological System for Cancer-Associated Fibroblasts Differentiation and Invasion In Vitro Studies

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In situ spheroid formation in distant submillimetre-bright galaxies.

Qing-Hua Tan^1,2, Emanuele Daddi³, Benjamin Magnelli⁴

¹Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, People's Republic of China. qhtan@pmo.ac.cn.

|December 5, 2024

Summary

Most stars form in galactic spheroids, a process poorly understood. This study reveals spheroids form directly from star formation in distant starburst galaxies, challenging previous models.

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Area of Science:

Astronomy and Astrophysics
Cosmic structure formation

Background:

Most stars in the present-day Universe reside in galactic spheroids (galaxy bulges and elliptical galaxies).
The formation mechanisms of these spheroids remain a significant unsolved problem in astrophysics.
Previous research linked high-redshift infrared/submillimetre-bright galaxies to spheroid formation, but faced challenges due to dust obscuration and data limitations.

Purpose of the Study:

To investigate the direct connection between high-redshift starburst galaxies and spheroid formation.
To overcome observational challenges like dust obscuration and limited signal-to-noise ratios in submillimetre observations.

Main Methods:

Utilized Atacama Large Millimeter/submillimeter Array (ALMA) to analyze submillimetre surface brightness profiles of high-redshift galaxies.
Examined the axis-ratio distributions of these galaxies to determine their three-dimensional shapes.
Compared observational data with cosmological simulations.

Main Results:

Demonstrated that spheroids are directly generated by star formation within the cores of luminous starburst galaxies in the early Universe.
ALMA profiles showed significant deviations from exponential disk models, indicating compact, triaxial structures.
Observed that most studied galaxies are triaxial, with axis ratios averaging 0.5, increasing with compactness.

Conclusions:

Starburst galaxies are a direct source of spheroid formation in situ.
Galaxy interactions and mergers, fueled by non-coplanar gas accretion, likely trigger these starbursts.
This provides a cosmologically significant pathway for spheroid assembly.