Do voids in the Universe influence the orientation of galaxies?

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Discussion Overview

The discussion revolves around the influence of voids in the Universe on the orientation of galaxies, particularly in the context of a newly discovered assembly of galaxies and the larger cosmic web structure. Participants explore the implications of this discovery for understanding galaxy formation, structure, and the role of dark matter.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants highlight the discovery of a new galaxy structure located nearly seven billion light-years away, suggesting it provides insight into the cosmic web and its formation.
  • Others note that the concept of a cosmic web has been known for over a decade, with earlier observations supporting the idea of large-scale structure formation in the Universe.
  • There are discussions about the role of dark matter in forming these structures, with some participants mentioning computer simulations that align with observed galaxy distributions.
  • One participant raises questions about the implications of the new observation for understanding environmental variations in galaxy properties and the effects of large-scale structure on galaxy evolution.
  • Participants discuss the differences between present-day distances and light travel time, with some arguing that clarity in distance measurement methods is essential for accurate understanding.
  • There is a contention regarding the use of light travel time as a measure of distance, with one participant defending its validity while another challenges its applicability in astronomical contexts.

Areas of Agreement / Disagreement

Participants express a mix of agreement and disagreement regarding the implications of the cosmic web structure and the appropriate methods for measuring distances in cosmology. While some acknowledge the significance of the discovery, others contest the interpretations and measurements discussed.

Contextual Notes

Limitations in the discussion include varying interpretations of distance measurements (present-day vs. light travel time) and the dependence on assumptions about dark matter and structure formation models. Unresolved mathematical steps and the implications of the new observations remain topics of contention.

  • #61
turbo-1 said:
Not a peer-reviewed paper, though I'd be very surprised if John Huchra hasn't already published on or has on in the works. I'll take a look.

http://www.newscientist.com/article/dn16903-new-cosmic-map-reveals-colossal-structures.html

Hmm. They don't give any details whatsoever in that article. I couldn't see any papers with Huchra as a co-author on ADS either, however Huchra may have just been approached for comment and may not have been part of the discovery. I'll wait for the paper to come out before commenting further or drawing strong conclusions.
 
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  • #62
matt.o said:
I couldn't see any papers with Huchra as a co-author on ADS either, however Huchra may have just been approached for comment and may not have been part of the discovery. I'll wait for the paper to come out before commenting further or drawing strong conclusions.

The other thing is that Huchra is an observationist and not a theoretician. He is a very good observationist, but I wouldn't immediately conclude that there really is a major problem based on an off-hand comment in a general journal.
 
  • #63
I haven't found a link to a free version of this paper, so I can't vouch for the methodology, analysis, etc, but these authors claim that spiral galaxies on the edges of voids have rotational axes that lie preferentially on the void surfaces. Could be interesting.

http://www.springerlink.com/content/tk02015561k5573h/
 

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