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相关论文: The 2dF QSO Redshift Survey - XIV. Structure and e…

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The evolution of the cluster mass function and the cluster correlation function from z = 0 to z = 3 are determined using 10^6 clusters obtained from high-resolution simulations of the current best-fit LCDM cosmology (\Omega_m = 0.27,…

天体物理学 · 物理学 2016-08-30 Joshua D. Younger , Neta A. Bahcall , Paul Bode

We describe a method from which cosmology may be constrained from the 2QZ Survey. By comparing clustering properties parallel and perpendicular to the line of sight and by modeling the effects of redshift space distortions, we are able to…

天体物理学 · 物理学 2009-11-06 Fiona Hoyle , P. J. Outram , T. Shanks , B. J. Boyle , S. M. Croom , R. J. Smith

Our goals are (i) to search for BAO and large-scale structure in current QSO survey data and (ii) to use these and simulation/forecast results to assess the science case for a new, >10x larger, QSO survey. We first combine the SDSS, 2QZ and…

宇宙学与河外天体物理 · 物理学 2012-02-01 U. Sawangwit , T. Shanks , S. M. Croom , M. J. Drinkwater , S. Fine , D. Parkinson , Nicholas P. Ross

We present constraints on the evolution of large-scale structure from a catalog of 710,000 galaxies with I_AB <= 24 derived from a KPNO 4m CCD imaging survey of a contiguous 4 deg x 4 deg region. The advantage of using large contiguous…

天体物理学 · 物理学 2009-10-30 Marc Postman , Tod R. Lauer , Istvan Szapudi , William Oegerle

(ABRIDGED) We present a power spectrum analysis of the 10K catalogue from the 2dF QSO Redshift Survey. We compare the redshift-space power spectra of QSOs to those measured for galaxies and Abell clusters at low redshift and find that they…

天体物理学 · 物理学 2009-11-06 Fiona Hoyle , P. J. Outram , T. Shanks , S. M. Croom , B. J. Boyle N. S. Loaring , L. Miller , R. J. Smith

Using ~300,000 photometrically classified quasars, by far the largest quasar sample ever used for such analyses, we study the redshift and luminosity evolution of quasar clustering on scales of ~50 kpc/h to ~20 Mpc/h from redshifts of…

QSOs from SDSS, 2QZ and 2SLAQ covering an order of magnitude in luminosity at fixed redshift exhibit similar amplitudes of clustering. In addition, QSO clustering evolution at z>0.5 is well fitted by a model that assumes a fixed host halo…

宇宙学与河外天体物理 · 物理学 2015-05-28 T. Shanks , S. M. Croom , S. Fine , N. P. Ross , U. Sawangwit

Detections of local maxima in the density perturbation spectrum at characteristic comoving scales L~100-200h^{-1}Mpc have previously been claimed. Here, this cosmic standard ruler is sought in the ``10K'' release of the 2dF QSO Redshift…

天体物理学 · 物理学 2009-11-06 B. F. Roukema , G. A. Mamon , S. Bajtlik

(Abridged) We study the two-point correlation function of a uniformly selected sample of 4,426 luminous optical quasars with redshift $2.9 \le z\le 5.4$ selected over 4041 deg$^2$ from the Fifth Data Release of the Sloan Digital Sky Survey.…

We present analyses of the two-point correlation properties of the ESP galaxy redshift survey. From the redshift-space correlation function xi(s), we see positive clustering out to separations ~50/h Mpc, with a smooth break on larger scales…

When the 2dF QSO Redshift Survey (2QZ) is complete, a powerful geometric test for the cosmological constant will be available. By comparing the clustering along and across the line of sight and modelling the effects of peculiar velocities…

天体物理学 · 物理学 2009-11-06 P. J. Outram , Fiona Hoyle , T. Shanks , B. J. Boyle , S. M. Croom , N. S. Loaring , L. Miller , R. J. Smith

We present a determination of the optical QSO luminosity function and its cosmological evolution with redshift for a sample of over 6000 QSOs identified primarily from the first observations of the 2dF QSO Redshift Survey (2QZ). For QSOs…

天体物理学 · 物理学 2019-08-17 B. J. Boyle , T. Shanks , S. M. Croom , R. J. Smith , L. Miller , N. Loaring , C. Heymans

We present results from an investigation of the clustering evolution of field galaxies between a redshift of z~1 and the present epoch. The current analysis relies on a sample of ~3600 galaxies from the Calar Alto Deep Imaging Survey…

天体物理学 · 物理学 2016-08-30 S. Phleps , K. Meisenheimer

We present detailed clustering measurements for a flux limited sample of 14,000 quasars extracted from the 2dF QSO Redshift Survey (2QZ) in the redshift range 0.8<z<2.1. After splitting the sample into three redshift bins and each of them…

天体物理学 · 物理学 2009-11-11 Cristiano Porciani , Peder Norberg

The evolution of QSO clustering is investigated with a new sample of 388 QSOs with 0.3<z<2.2, B<20.5 and M_B<-23. Evidence is found for an increase of the clustering amplitude with increasing redshift. These measurements allow to further…

天体物理学 · 物理学 2007-05-23 F. La Franca , P. Andreani , S. Cristiani

We measure the quasar two-point correlation function over the redshift range 2.2<z<2.8 using data from the Baryon Oscillation Spectroscopic Survey. We use a homogeneous subset of the data consisting of 27,129 quasars with spectroscopic…

We have analyzed the clustering of C IV absorption line systems in an extensive new catalog of heavy element QSO absorbers. The catalog permits exploration of clustering over a large range in both scale (from about 1 to over 300 Mpc) and…

天体物理学 · 物理学 2009-05-29 Jean M. Quashnock , Daniel E. Vanden Berk , Donald G. York

We present a clustering analysis of Luminous Red Galaxies (LRGs) using nearly 9 000 objects from the final catalogue of the 2dF-SDSS LRG And QSO (2SLAQ) Survey. We measure the redshift-space two-point correlation function, xi(s), at the…