The zero-crossing scale and the problem of galaxy bias
| dc.creator | Labini, Francesco Sylos | |
| dc.date | 2005-07-12 | |
| dc.date.accessioned | 2026-07-07T02:18:15Z | |
| dc.date.available | 2026-07-07T02:18:15Z | |
| dc.description | 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 ξ(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 ξ(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. | |
| dc.description | 8 pages, 6 .eps figures | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0507277 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0507277 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/9417 | |
| dc.subject | Astrophysics | |
| dc.title | The zero-crossing scale and the problem of galaxy bias | |
| dc.type | text |