The Gravitational Lensing in Redshift-space Correlation Functions of Galaxies and Quasars
نویسنده
چکیده
The gravitational lensing, as well as the velocity field and the cosmological light-cone warp, changes the observed correlation function of high-redshift objects. We present an analytical expression of 3D correlation function, simultaneously including those three effects. When two objects are separated over several hundreds Mpc along a line of sight, the observed correlation function is dominated by the effect of gravitational lensing rather than the intrinsic clustering. For a canonical lambda-CDM model, the lensing signals in the galaxy-galaxy and galaxy-QSO correlations are beyond noise levels in large-scale redshift surveys like the Sloan Digital Sky Survey. Subject headings: cosmology: theory — gravitational lensing — large-scale structure of universe — methods: statistical
منابع مشابه
Imaging of Sdss Z> 6 Quasar Fields: Gravitational Lensing, Companion Galaxies and the Host Dark Matter Halos
We have undertaken deep optical imaging observations of three 6.2 < z < 6.5 quasar fields in the i and z filters. These data are used to search for foreground galaxies which are gravitationally lensing the quasars and distant galaxies physically associated with the quasars. Foreground galaxies are found closer than 5 from the lines-of-sight of two of the three quasars. However, the faintness of...
متن کاملDiscovery of a Galaxy Cluster in the Foreground of the Wide-separation Quasar Pair Um425
We report the discovery of a cluster of galaxies in the field of UM425, a pair of quasars separated by 6.5. Based on this finding, we revisit the long-standing question of whether this quasar pair is a binary quasar or a wide-separation lens. Previous work has shown that both quasars are at z = 1.465 and show broad absorption lines. No evidence for a lensing galaxy has been found between the qu...
متن کاملA Submillimeter Survey of Gravitationally Lensed Quasars
Submillimeter (and in some cases millimeter) wavelength continuum measurements are presented for a sample of 40 active galactic nuclei (probably all quasars) lensed by foreground galaxies. The object of this study is to use the lensing boost, anywhere from ∼ 3 − 20 times, to detect dust emission from more typical AGNs than the extremely luminous ones currently accessible without lensing. The so...
متن کاملA Snapshot Survey for Gravitational Lenses Among z ≥ 4 . 0 Quasars : II . Constraints on the 4 . 0 < z < 4 . 5 Quasar Population
We report on i-band snapshot observations of 157 Sloan Digital Sky Survey (SDSS) quasars at 4 < z < 5.4 using the Advanced Camera for Surveys on the Hubble Space Telescope (HST) to search for evidence of gravitational lensing of these sources. None of the quasars appear to be strongly lensed and multiply imaged at the angular resolution (∼ 0. 1) and sensitivity of HST. The non-detection of stro...
متن کاملHigh-Redshift Galaxies: Their Predicted Size and Surface Brightness Distributions and Their Gravitational Lensing Probability
Direct observations of the first generation of luminous objects will likely become feasible over the next decade. The advent of the Next Generation Space Telescope (NGST ) will allow imaging of numerous galaxies and mini-quasars at redshifts z ∼> 5. We apply semi-analytic models of structure formation to estimate the rate of multiple imaging of these sources by intervening gravitational lenses....
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000