SIMBAD references

2009ApJ...703L.132Z - Astrophys. J., 703, L132-L136 (2009/October-1)

Discovery of the largest known lensed images formed by a critically convergent lensing cluster.


Abstract (from CDS):

We identify the largest known lensed images of a single spiral galaxy, lying close to the center of the distant cluster MACS J1149.5+2223 (z = 0.544). These images cover a total area of and are magnified ≃200 times. Unusually, there is very little image distortion, implying that the central mass distribution is almost uniform over a wide area (r ≃ 200 kpc) with a surface density equal to the critical density for lensing, corresponding to maximal lens magnification. Many fainter multiply lensed galaxies are also uncovered by our model, outlining a very large tangential critical curve, of radius r ≃ 170 kpc, posing a potential challenge for the standard LCDM cosmology. Because of the uniform central mass distribution, a particularly clean measurement of the mass of the brightest cluster galaxy is possible here, for which we infer stars contribute most of the mass within a limiting radius of ≃30 kpc, with a mass-to-light ratio of M/LB≃ 4.5(M/L). This cluster with its uniform and central mass distribution acts analogously to a regular magnifying glass, converging light without distorting the images, resulting in the most powerful lens yet discovered for accessing the faint high-z universe.

Abstract Copyright:

Journal keyword(s): dark matter - galaxies: clusters: individual: MACS J1149.5+2223 - gravitational lensing

Nomenclature: Fig. 2: [ZB2009] NN.N N=31 among (Nos 1.1-1.5 to 10.1-10.2).

Simbad objects: 4

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