SIMBAD references

2009ApJ...707L.102Z - Astrophys. J., 707, L102-L106 (2009/December-2)

The largest gravitational lens: MACS J0717.5+3745 (z = 0.546).


Abstract (from CDS):

We identify 13 sets of multiply-lensed galaxies around MACS J0717.5+3745 (z = 0.546), outlining a very large tangential critical curve of major axis ∼2'.8, filling the field of the Hubble Space Telescope/Advanced Camera for Surveys. The equivalent circular Einstein radius is θe= 55'' ± 3'' (at an estimated source redshift of zs∼ 2.5), corresponding to re ≃ 350±20 kpc at the cluster redshift, nearly three times greater than that of A1689 (re≃ 140 kpc for zs= 2.5). The mass enclosed by this critical curve is very large, 7.4±0.5x1014 M and only weakly model dependent, with a relatively shallow mass profile within r < 250 kpc, reflecting the unrelaxed appearance of this cluster. This shallow profile generates a much higher level of magnification than the well-known relaxed lensing clusters of higher concentration, so that the area of sky exceeding a magnification of >10 times, is ≃3.5{squ}' for sources with z ≃ 8, making MACS J0717.5+3745 a compelling target for accessing faint objects at high redshift. We calculate that only one such cluster, with θe≥ 55'', is predicted within ∼107 Universes with z ≥ 0.55, corresponding to a virial mass ≥3x1015 M, for the standard ΛCDM (WMAP5 parameters with 2σ uncertainties).

Abstract Copyright:

Journal keyword(s): dark matter - galaxies: clusters: individual: MACS J0717.5+3745 - gravitational lensing

Nomenclature: Fig. 1: [ZBR2009] MACS J0717 NN.N (Nos 1.1-1.4 to 13.1-13.3).

Simbad objects: 8

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