How are galaxies generated?
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Galaxies are generated through a process of structure formation in the Universe. The dominant matter component of the Universe is non-baryonic, weakly interacting dark matter, which originated from inhomogeneities generated shortly after the Big Bang during a period of accelerated expansion called inflation . These early inhomogeneities were gravitationally amplified as the Universe expanded, leading to the formation of small objects that later merged together to form larger structures . Gas is able to reach high enough densities to cool, sink to the center of a high density lump of dark matter, and form stars, resulting in the formation of galaxies . The collision of infalling and outstreaming particles from astrophysical black holes, such as gravastars, may also catalyze galaxy formation . The interplay between complex physical processes, such as supernovae, gas reheating, and galaxy mergers, further shapes the evolution of galaxies .
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| Papers (5) | Insight |
|---|---|
| The paper discusses galaxy formation through accretion and in-situ star formation. It states that galaxies grow through mergers at a rate of approximately 2.6% per Gyr, with major mergers not dominating the accretion history of massive galaxies. | |
| The paper discusses the origin and evolution of galaxies, focusing on the idea that the origin of galaxies can be traced back to quantum fluctuations generated at the time of the big bang. However, the specific process of how galaxies are generated is not mentioned in the paper. | |
2 Citations | The paper mentions that galaxies are formed when gas reaches high enough densities to cool, sink to the center of a high density lump of dark matter, and form stars. However, the specific details of galaxy formation and evolution are still poorly understood. |
| The paper discusses the formation of galaxies through near collisions, tidal disturbances, and the collapse of interstellar clouds. It also mentions the role of dark matter in galaxy cluster evolution. | |
| The paper proposes that galaxy formation is catalyzed by the collision of particles from leaky, horizonless astrophysical black holes, most likely gravastars. |
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