Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9132e&link_type=abstract
HST Proposal ID #9132
Physics
Hst Proposal Id #9132 Cosmology
Scientific paper
Exhaustive ground-based studies have not resolved the physical nature of the highly significant gravitational lensing signal observed by Erben et al in the field of the rich cluster Abell 1942 {z=0.22}. Independent lensing analyses of two optical datasets reveal a striking mass concentration eq7 arcmin south of the cluster centre with no obvious visible source counterpart. Placed at the redshift of the cluster the implied mass would be M{0.5h^-1mboxMpc} >= 1* 10^14M_odot. The absence of an obvious excess of faint sources in suitably deep infrared images makes it highly unlikely that such a strong lensing signal can be caused by a projected background cluster of galaxies. Accordingly we must take seriously the possibility of either the detection of a new type of extragalactic object or some hitherto undiscovered uncertainty in the weak lensing mass reconstruction techniques. The former is of obvious importance but so would be the latter given the increasingly important role lensing plays in constraining the mass power spectrum. A modest HST allocation will significantly improve the precision and localised position of this puzzling signal enabling the first detailed examination of both possibilities.
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