What are the theories of galaxy formation?

One says that galaxies were born when vast clouds of gas and dust collapsed under their own gravitational pull, allowing stars to form. The other, which has gained strength in recent years, says the young universe contained many small “lumps” of matter, which clumped together to form galaxies.

What are the two models of galaxy formation?

Here we review the current status of models that employ two leading techniques to simulate the physics of galaxy formation: semianalytic models and numerical hydrodynamic simulations. Modelers have converged on a core set of physical processes that are critical for shaping galaxy properties.

How do galaxies form through the process of hierarchical galaxy formation?

Galaxy Groups form through the merger of individual galaxies. Groups then come together to form larger groups and clusters, which in turn merge to form large-scale filaments, walls and superclusters. An example of the ongoing process of hierarchical merging can be initiated with the Milky Way.

Which type of galaxy was the first large scale structure of the universe?

elliptical galaxies
We also saw in Active Galaxies, Quasars, and Supermassive Black Holes that many quasars are found in the centers of elliptical galaxies. This means that some of the first large concentrations of matter must have evolved into the elliptical galaxies that we see in today’s universe.

How are galaxies formed in bottom up theories?

Bottom-Up Theories. In bottom-up theories it is assumed that masses the size of star clusters collapse first, and these then assemble through collisions and mergers into galaxies, clusters of galaxies, and superclusters. The adjacent figure illustrates schematically.

Which is the best scenario for galaxy formation?

The competing scenario is one where galaxies form first and merge into clusters, called the bottom-up scenario. In this scenario, the density enhancements at the time of recombination were close to the size of small galaxies today. These enhancements collapsed from self-gravity into dwarf galaxies.

How are star clusters formed in bottom up theory?

In bottom-up theories it is assumed that masses the size of star clusters collapse first, and these then assemble through collisions and mergers into galaxies, clusters of galaxies, and superclusters.

What is the study of galaxy formation and evolution?

Galaxy formation and evolution. The study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies.

https://www.youtube.com/watch?v=-vIsiyKnuss