Gravitational Magnification And Cluster Masses
نویسندگان
چکیده
منابع مشابه
Cluster Dynamics and Cluster Masses
In spite of the promise of new techniques for constraining the mass distribution in galaxy clusters, much remains to be learned from galaxy orbital velocities. This article reviews the theory of potential estimation in hot dynamical systems like galaxy clusters. An analysis is presented of the Coma cluster, based on a sample of 1500 galaxies with probable membership, of which 450 have measured ...
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We present the first application of lens magnification to measure the absolute mass of a galaxy cluster; Abell 1689. The absolute mass of a galaxy cluster can be measured by the gravitational lens magnification of a background galaxy population by the cluster gravitational potential. The lensing signal is complicated by the intrinsic variation in number counts due to galaxy clustering and shot–...
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Two colour photometry of the cluster A1689 reveals a `relative magniication-bias' between lensed blue and red background galaxies, arising from a dependence of the faint galaxy count-slope on colour. The colour distribution is skewed blueward of the far eld, allowing us to measure the cluster magniication and to understand the notorious blueness of large arcs. We show that the magniication info...
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Strong gravitational lensing of distant supernovae (SNe), particularly Type Ia’s, has some exploitable properties not available when other sorts of cosmologically distant sources are lensed. One such property is that the “standard candle” nature of SN at peak brightness allows a direct determination of the lensing magnification factor for each well observed image. Another is that the duration o...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1996
ISSN: 0074-1809
DOI: 10.1017/s0074180900231161