Derivation of the cosmological number density in depth from V/Vm distribution
Abstract
Description
The classical cosmological V/Vm-test is introduced. Use of the differential distribution p(V/Vm) of the V/Vm-variable rather than just the mean <V/Vm> leads directly to the cosmological number density without any need for assumptions about the cosmological evolution of the underlying (quasar) population. Calculation of this number density n(z) from p(V/Vm) is illustrated using the best sample that was available in 1981, when this method was developed. This sample of 76 quasars is clearly too small for any meaningful results. The method will be later applied to a much larger cosmological sample to infer the cosmological number density n(z) as a function of the depth z. Keywords: V/Vm . luminosity volume . cosmological number density . V/Vm distribution
5 pages, 3 tables, For Proceedings of 27th Meeting of Astronomical Scociety of India, 18-20th February 2009, Indian Institute of Astrophysics, Bangaluru
5 pages, 3 tables, For Proceedings of 27th Meeting of Astronomical Scociety of India, 18-20th February 2009, Indian Institute of Astrophysics, Bangaluru