Using radio galaxies to find super-structures

Details Using radio galaxies to find super-structures Using radio galaxies to find super-structures

2003-02-10

arxiv.org/abs/astro-ph/0302170v1

New Astron.Rev. 47 (2003) 325-328

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures. To appear in "Radio galaxies: past, present and future", eds M. Jarvis et al., Leiden, Nov 2002

Scientific paper

10.1016/S1387-6473(03)00049-6

Radio galaxies are excellent at tracing large-scale structure due to their high bias. We present new results from the TONS08 radio galaxy redshift survey. We find unequivocal evidence for a huge (at least 80 x 80 x 100 Mpc^3) super-structure at redshift z=0.27, confirming tentative evidence for such a structure from the 7C redshift survey (7CRS). A second, newly discovered super-structure is also tentatively found at redshift 0.35 (of dimensions at least 100 x 100 x 100 Mpc^3). Out of the total sample size of 84 radio galaxies, at least 25 are associated with the two super-structures. We use quasi-linear structure formation theory to estimate the number of such structures expected in the TONS08 volume if the canonical value for radio galaxy bias is assumed. Under this assumption, the structures represent ~ 4-5 sigma peaks in the primordial density field and their expected number is low (10^{-2}-10^{-4}). Fortunately, there are several plausible explanations (many of which are testable) for these low probabilities in the form of potential mechanisms for boosting the bias on large scales. These include: the association of radio galaxies with highly biased rich clusters in super-structures, enhanced triggering by group/group mergers, and enhanced triggering and/or redshift space distortion in collapsing systems as the growth of super-structures moves into the non-linear regime. Similar structures could have been missed in previous surveys because of the effects of Poisson-sampling fluctuations.

Affiliated with

Also associated with

No associations

Rating

Using radio galaxies to find super-structures does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Using radio galaxies to find super-structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Using radio galaxies to find super-structures will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-72783