What is galaxy formation: Definition and 15 Discussions

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. Galaxy formation is hypothesized to occur from structure formation theories, as a result of tiny quantum fluctuations in the aftermath of the Big Bang. The simplest model in general agreement with observed phenomena is the Lambda-CDM model—that is, that clustering and merging allows galaxies to accumulate mass, determining both their shape and structure.

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  1. T

    B Is the Universe older than we think?

    The James Webb Space Telescope, JWST, has revolutionised our views of galaxy formation in the early universe, suggesting that galaxies showing structure may have been formed at much earlier times than our best models of galaxy evolution predict. This has even led to suggestions that The Universe...
  2. S

    I Deviations of conservation laws in cosmological evolution?

    If energy is "not conserved" in General Relativity (or at least, it is difficult to define it) in the context of an expanding accelerating spacetime (like it happens in our Universe), are there any observations of deviations from the strict conservation laws in the evolution and formation of...
  3. cosmologyscience

    Exploring the Universe: Galaxy Formation, Redshift, and Cosmology

    Hello, I'm an independent researcher in cosmology and working on topics like cosmological redshift, galaxy formation and galaxy cluster dynamics. Came across the forum searching for details about the solar system orientation in the galaxy rotation disk. Very inspired and enthusiastic about the...
  4. F

    B Does galaxy formation conserve mass and angular momentum?

    Last week I posted in General Physics some questions about what happens in a collapsing gas cloud, and I was advised that total angular momentum is conserved. I thought of asking for extra clarification here, as that seems really amazing -- I apologize for asking the same thing twice. I use a...
  5. PhotonSSBM

    A Exploring Dark Matter's Influence on Galaxy Formation

    Arxiv and google searches turn up hundreds of sources on Galaxy formation. I'm specifically looking for good material on how Dark Matter distorts the motions of galaxies from what we'd expect. Currently I've been using a combination of Binney and Tremaine's Galactic Dynamics and whatever...
  6. wolram

    The impossible early galaxy formation

    Is there general consensus that the universe is to young? arXiv:1506.01377 [pdf, ps, other] The Impossibly Early Galaxy Problem Charles L. Steinhardt, Peter Capak, Dan Masters, Josh S. Speagle Comments: 7 pages, submitted Subjects: Astrophysics of Galaxies (astro-ph.GA) The current hierarchical...
  7. wolram

    Galaxy Formation: Searching for Primordial Origins

    When trying to work out how galaxies formed, there must have been some seed; some perturbations that started the ball rolling, These perturbations which collapsed gravitationaly to form seed galaxies must have been primordial in origin, where did they come from?
  8. J

    Dark Matter. Space-Time curvature. Galaxy formation

    1. Gravity is the geometric curvature of space-time caused by massive objects. 2. Dark Matter surrounds galaxies. 3. Dark Matter is thought to be critical in galaxy formation. 4. The mass of Dark Matter creates curvatures in space-time around baryonic matter which forms galaxies. What roles...
  9. F

    Question about galaxy formation and black holes.

    In another topic, a member dave13214321323 or whatever his name is :p said that the popular opinion is that in the early universe gas contracted into denser spaces forming galaxies and black holes were consequences of galaxy formation, not the other way around; Black holes at centers of galaxies...
  10. T

    'Close Encounters' and Galaxy formation

    So I was reading through a textbook and came across the term 'close encounter' but no definition or explination of what it means. From what I can make out, I would assume it's referring to asteroid interaction with young galaxies and the role in forming galaxies and stars but this is all...
  11. L

    Black Holes and Galaxy formation

    http://blackholes.stardate.org/resources/articles/article.php?id=9 This presupposes that dark matter and dark energy interactions play no role?
  12. J

    Principles behind galaxy formation

    When things are kept at the simplest, I've heard that galaxies were formed because gravity pulls stuff together, but there's some things that are not fully making sense. If two objects are far away, and they get attracted by gravity, what happens is that they merely pass each others with some...
  13. B

    Supermassive blackholes and galaxy formation.

    The question I'm about to asked has probably asked before many times b , but I keyed in a "supermassive black holes and galaxy formation" in the PF search engine , and this question has yet to be asked: How can supermassive black holes be aid the formation of galaxies when they are suppose to...
  14. wolram

    Exploring Theories of Spiral Galaxy Formation

    So far i have found two theorise of how they form, the SSPSF shock wave model ,and the Density wave model, or they may form by a combination of the two. As i am not sure how old these theories are, i wonder if there are any new insights on the subject?
  15. H

    Current galaxy formation in the CDM model

    The CDM model predicts the existence of lots of dark halos without star formation. These are halos which did not attract enough baryons in order to set some kind of gravitational instability, which could lead to the further collapse of the baryons and to star formation (see, e.g...