Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Barber, Andrew J."'
Publikováno v:
Mon.Not.Roy.Astron.Soc. 356 (2005) 386-400
We study various measures of weak lensing distortions in future surveys, taking into account the noise arising from the finite survey size and the intrinsic ellipticity of galaxies. We also consider a realistic redshift distribution of the sources, a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0402227
Publikováno v:
Mon.Not.Roy.Astron.Soc.350:77,2004
In this paper we describe the predictions for the smoothed weak lensing shear and aperture-mass of two simple analytical models of the density field: the minimal tree-model and the stellar model. Both models give identical results for the statistics
Externí odkaz:
http://arxiv.org/abs/astro-ph/0309698
Publikováno v:
Mon.Not.Roy.Astron.Soc. 347 (2004) 667
Weak lensing convergence can be used directly to map and probe the dark mass distribution in the universe. Building on earlier studies, we recall how the statistics of the convergence field are related to the statistics of the underlying mass distrib
Externí odkaz:
http://arxiv.org/abs/astro-ph/0304451
Publikováno v:
Mon.Not.Roy.Astron.Soc. 347 (2004) 654
Weak gravitational lensing surveys are rapidly becoming important tools to probe directly the mass density fluctuations in the universe and its background dynamics. Earlier studies have shown that it is possible to model the statistics of the converg
Externí odkaz:
http://arxiv.org/abs/astro-ph/0303472
Autor:
Barber, Andrew J., Taylor, A. N.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 344 (2003) 789
We present new results on the gravitational lensing shear and magnification power spectra obtained from numerical simulations of a flat cosmology with a cosmological constant. These results are of considerable interest since both the shear and the ma
Externí odkaz:
http://arxiv.org/abs/astro-ph/0212378
Autor:
Barber, Andrew J.
Underlying cosmologies with deceleration parameter, $q_0=-0.51^{+0.03}_{-0.24},$ may be interpreted as having $q_0=-0.55,$ on the basis of weak gravitational lensing effects.
Comment: Published 2001, Astronomical Society of the Pacific, Conferen
Comment: Published 2001, Astronomical Society of the Pacific, Conferen
Externí odkaz:
http://arxiv.org/abs/astro-ph/0109043
Autor:
Barber, Andrew J.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 335 (2002) 909
The weak lensing shear signal has been measured numerically in $N$-body simulations at 14 different redshifts ($z_s = 0.1$ to 3.6) and on angular scales of $\theta = 2'$ to 32'. In addition, the data have been validated by analytical computations for
Externí odkaz:
http://arxiv.org/abs/astro-ph/0108273
Autor:
Barber, Andrew J.
Publikováno v:
Mon.Not.Roy.Astron.Soc. 318 (2000) 195
Significant adjustments to the values of the cosmological parameters estimated from high-redshift Type Ia Supernov\ae data are reported, almost an order of magnitude greater than previously found. They arise from the effects of weak gravitational len
Externí odkaz:
http://arxiv.org/abs/astro-ph/0003304
Publikováno v:
Mon.Not.Roy.Astron.Soc. 319 (2000) 267
We present the results of weak gravitational lensing statistics in four different cosmological $N$-body simulations. The data has been generated using an algorithm for the three-dimensional shear, which makes use of a variable softening facility for
Externí odkaz:
http://arxiv.org/abs/astro-ph/0002437