The zero-crossing scale and the problem of galaxy bias

Astronomy and Astrophysics – Astrophysics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

8 pages, 6 .eps figures

Scientific paper

One of the main problems in the studies of large scale galaxy structures concerns the relation of the correlation properties of a certain population of objects with those of a selected subsample of it, when the selection is performed by considering physical quantities like luminosity or mass. I consider the case where the sampling is defined as in the simplest thresholding selection scheme of the peaks of a Gaussian random field as well as the case of the extraction of point distributions in high density regions from gravitational N-body simulations. I show that an invariant scale under sampling is represented by the zero-crossing scale of \xi(r). By considering recent measurements in the 2dF and SDSS galaxy surveys I note that the zero-point crossing length has not yet been clearly identified, while a dependence on the finite sample size related to the integral constraint is manifest. I show that this implies that other length scales derived from \xi(r) are also affected by finite size effects. I discuss the theoretical implications of these results, when considering the comparison of structures formed in N-body simulations and observed in galaxy samples, and different tests to study this problem.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

The zero-crossing scale and the problem of galaxy bias 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 The zero-crossing scale and the problem of galaxy bias, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The zero-crossing scale and the problem of galaxy bias will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-371493

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.