Zobrazeno 61 - 70
of 260
pro vyhledávání: '"Bridle, S. L."'
Autor:
Joachimi, B., Bridle, S. L.
Publikováno v:
Astron.Astrophys.523:A1,2010
Cosmic shear is a powerful method to constrain cosmology, provided that any systematic effects are under control. The intrinsic alignment of galaxies is expected to severely bias parameter estimates if not taken into account. We explore the potential
Externí odkaz:
http://arxiv.org/abs/0911.2454
Autor:
Voigt, L. M., Bridle, S. L.
Gravitational lensing shear has the potential to be the most powerful tool for constraining the nature of dark energy. However, accurate measurement of galaxy shear is crucial and has been shown to be non-trivial by the Shear TEsting Programme. Here
Externí odkaz:
http://arxiv.org/abs/0905.4801
Autor:
Abate, Alexandra, Wittman, D., Margoniner, V. E., Bridle, S. L., Gee, Perry, Tyson, J. Anthony, Antonio, Ian P. Dell
Publikováno v:
Astrophys.J.702:603-613,2009
We present weak lensing mass estimates of seven shear-selected galaxy cluster candidates from the Deep Lens Survey. The clusters were previously identified as mass peaks in convergence maps of 8.6 sq. deg of R band imaging, and followed up with X-ray
Externí odkaz:
http://arxiv.org/abs/0904.2185
Autor:
Hawken, A. J., Bridle, S. L.
We present equations for the gravitational lensing flexion expected for an elliptical lens mass distribution. These can be reduced to one-dimensional finite integrals, thus saving significant computing time over a full two-dimensional calculation. We
Externí odkaz:
http://arxiv.org/abs/0903.3938
The control of systematic effects when measuring galaxy shapes is one of the main challenges for cosmic shear analyses. In this context, we study the fundamental limitations on shear accuracy due to the measurement of the Point Spread Function (PSF)
Externí odkaz:
http://arxiv.org/abs/0711.4886
Autor:
Rawlings, S., Abdalla, F. B., Bridle, S. L., Blake, C. A., Baugh, C. M., Greenhill, L. J., van der Hulst, J. M.
Publikováno v:
New Astron.Rev.48:1013-1027,2004
The present-day Universe is seemingly dominated by dark energy and dark matter, but mapping the normal (baryonic) content remains vital for both astrophysics - understanding how galaxies form - and astro-particle physics - inferring properties of the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0409479
Publikováno v:
Mon.Not.Roy.Astron.Soc.346:593,2003
We present results from the analysis of cosmic microwave background (CMB), large scale structure (galaxy redshift survey) and X-ray galaxy cluster (baryon fraction and X-ray luminosity function) data, assuming a geometrically flat cosmological model
Externí odkaz:
http://arxiv.org/abs/astro-ph/0306386
Publikováno v:
Mon.Not.Roy.Astron.Soc.348:603,2004
We apply the Bayesian concept of `evidence' to reveal systematically the nature of dark energy from present and future supernova luminosity distance measurements. We express the unknown dark energy equation of state w(z) as a low order polynomial in
Externí odkaz:
http://arxiv.org/abs/astro-ph/0305526
Publikováno v:
Mon.Not.Roy.Astron.Soc. 342 (2003) L72
We reconstruct the shape of the primordial power spectrum from the latest cosmic microwave background data, including the new results from the Wilkinson Microwave Anisotropy Probe (WMAP), and large scale structure data from the two degree field galax
Externí odkaz:
http://arxiv.org/abs/astro-ph/0302306
Autor:
Elgaroy, O., Lahav, O., Percival, W. J., Peacock, J. A., Madgwick, D. S., Bridle, S. L., Baugh, C. M., Baldry, I. K., Bland-Hawthorn, J., Bridges, T., Cannon, R., Cole, S., Colless, M., Collins, C., Couch, W., Dalton, G., De Propris, R., Driver, S. P., Efstathiou, G. P., Ellis, R. S., Frenk, C. S., Glazebrook, K., Jackson, C., Lewis, I., Lumsden, S., Maddox, S., Norberg, P., Peterson, B. A., Sutherland, W., Taylor, K.
Publikováno v:
Phys.Rev.Lett.89:061301,2002
We constrain f_nu = Omega_nu / Omega_m, the fractional contribution of neutrinos to the total mass density in the Universe, by comparing the power spectrum of fluctuations derived from the 2dF Galaxy Redshift Survey with power spectra for models with
Externí odkaz:
http://arxiv.org/abs/astro-ph/0204152