Clustering in real space and in redshift space

Clicks: 4
ID: 290461
1987
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Star

Ranked #281 of 913 articles by views in monthly notices of the royal astronomical society

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 913 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
Peculiar velocities distort the clustering pattern in red shift space on all scales. Four consequences of this are: (i) The acceleration vector derived by summing the inverse squared redshifts of galaxies differs significantly from the true acceleration even in linear theory. Estimates of Ω obtained in this manner are only reliable for small Ω. (ii) The power spectrum of large-scale clustering has a quadrupole anisotropy, providing a way to estimate Ω. We calculated, for various assumed power spectra, the line-of-sight correlation function in redshift space, ξυ. We find that ξυ may display a strong anticorrelation feature that has no counterpart in real space. (iii) The density contrast of the local supercluster will appear enhanced in redshift space. Using a simple infall model (with Ω = l), we simulate the Shapley–Ames catalogue. For an infall velocity around 350 km s–1, the apparent density is similar to that observed, so the data do not require Ω⪡ 1, or biasing on large scales. (iv) Turnaround is estimated to occur at a radius ≃1500 km s–1 from a rich cluster, resulting in large transverse features of this scale. Since the velocity field is apparently very coherent, high density caustic surfaces must result. Guided by the appearance of the spherical model, we argue that the shell-like structures seen in some recent redshift surveys are most naturally interpreted as these caustics, rather than as the result of energetic explosions. The model also shows the apparent falling velocity dispersion with radius that is often seen in rich clusters, and suggests that the interpretation of this in terms of equilibrium models is inappropriate.
Reference Key
openalex_W2128759530 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Nick Kaiser
Journal monthly notices of the royal astronomical society
Year 1987
DOI
10.1093/mnras/227.1.1
URL
https://academic.oup.com/mnras/article-pdf/227/1/1/18522208/mnras227-0001.pdf
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.