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Akademický článek
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Autor:
Kitching, T. D., Balan, S. T., Bridle, S., Cantale, N., Courbin, F., Eifler, T., Gentile, M., Gill, M. S. S., Harmeling, S., Heymans, C., Hirsch, M., Honscheid, K., Kacprzak, T., Kirkby, D., Margala, D., Massey, R. J., Melchior, P., Nurbaeva, G., Patton, K., Rhodes, J., Rowe, B. T. P., Taylor, A. N., Tewes, M., Viola, M., Witherick, D., Voigt, L., Young, J., Zuntz, J.
Publikováno v:
MNRAS (2012) 423 (4): 3163-3208
In this paper we present results from the weak lensing shape measurement GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Galaxy Challenge. This marks an order of magnitude step change in the level of scrutiny employed in weak lensing shape meas
Externí odkaz:
http://arxiv.org/abs/1202.5254
Autor:
Voigt, L. M., Bridle, S. L., Amara, A., Cropper, M., Kitching, T. D., Massey, R., Rhodes, J., Schrabback, T.
Cosmic shear has been identified as the method with the most potential to constrain dark energy. To capitalise on this potential it is necessary to measure galaxy shapes with great accuracy, which in turn requires a detailed model for the image blurr
Externí odkaz:
http://arxiv.org/abs/1105.5595
Autor:
Cypriano, E. S., Amara, A., Voigt, L. M., Bridle, S. L., Abdalla, F. B., Refregier, A., Seiffert, M., Rhodes, J.
Cosmic shear requires high precision measurement of galaxy shapes in the presence of the observational Point Spread Function (PSF) that smears out the image. The PSF must therefore be known for each galaxy to a high accuracy. However, for several rea
Externí odkaz:
http://arxiv.org/abs/1001.0759
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
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:
Voigt, L. M., Fabian, A. C.
Publikováno v:
Mon.Not.Roy.Astron.Soc.368:518-533,2006
Accurate measurements of the mass distribution in galaxy and cluster halos are essential to test the cold dark matter (CDM) paradigm. The cosmological model predicts a universal shape for the density profile in all halos, independent of halo mass. It
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602373
Autor:
Voigt, L. M., Fabian, A. C.
Publikováno v:
Mon.Not.Roy.Astron.Soc.347:1130,2004
Conduction may play an important role in reducing cooling flows in galaxy clusters. We analyse a sample of sixteen objects using Chandra data and find that a balance between conduction and cooling can exist in the hotter clusters (T > 5 keV), provide
Externí odkaz:
http://arxiv.org/abs/astro-ph/0308352
Publikováno v:
Mon.Not.Roy.Astron.Soc.335:L71,2002
On the basis of the universal gas fraction in clusters of galaxies, we estimate that the effective thermal conductivity required to balance radiative cooling in the cores, where the gas temperature is 3-10keV, is about one tenth of the Spitzer rate.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0206437
Publikováno v:
Mon.Not.Roy.Astron.Soc.335:L7,2002
Chandra and XMM-Newton observations have confirmed the presence of large temperature gradients within the cores of many relaxed clusters of galaxies. Here we investigate whether thermal conduction operating over those gradients can supply sufficient
Externí odkaz:
http://arxiv.org/abs/astro-ph/0203312