The astronomers surmise that early in the universe's history, mergers and acquisitions created galaxies. Numerous theoretical and observational pieces of evidence lend support to this hypothesis.
According to the notion of hierarchical merging, smaller galaxies were acquired and merged to generate larger galaxies.
Both empirical data and theoretical theories bolster this theory.
Theoretical Basis:
1. N-body simulations: These theoretical models show how mergers might result in the development of bigger galaxies by simulating the gravitational interactions between galaxies.
2. Cosmological theories: Over cosmic time, small structures merge and evolve into larger structures according to hierarchical structure formation predicted by theoretical cosmological models like the Lambda Cold Dark Matter (λCDM) model.
Support from Observations:
1. Galaxy morphology: Structures found in galaxies that are consistent with the aftermath of galaxy mergers include tidal tails, shells, and twisted forms.
2. Interactions between galaxies: Signs of gravitational interactions, like as tidal pressures and starbursts that are triggered by prior mergers, are seen in observations of interacting galaxies.
3. Galaxy evolution: Research on galaxy populations over cosmic epochs shows a tendency toward a higher frequency of galaxy mergers in the early universe, which may have a major impact on galaxy formation.
Both theoretical and observational data point to the formation of galaxies through mergers and acquisitions early in the universe's history.
Cosmic models and N-body simulations are examples of theoretical models that shed light on the gravitational dynamics of galaxy mergers.
Studies of the morphology, interactions, and evolution of galaxies through observation provide signs that are consistent with the history of mergers.
The concept that mergers shaped the structure and evolution of galaxies throughout cosmic history is strengthened by the convergence of theoretical and observational evidence.
Question
why do astronomers believe that galaxies were formed by mergers and acquisitions early in the history of the universe? a. this idea is supported by several pieces of theoretical and observational evidence. b. sort each piece of evidence below according to whether it provides theoretical support, observational support, or no support for hierarchical merging.