The Enigma Lens Q2345+007: Early Assembly of Dark Matter?

Details The Enigma Lens Q2345+007: Early Assembly of Dark Matter? The Enigma Lens Q2345+007: Early Assembly of Dark Matter?

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6503t&link_type=abstract

HST Proposal ID #6503

Mathematics

Logic

Hst Proposal Id #6503 Cosmology

Scientific paper

We propose to carry out deep imaging with the WFPC2 of the double QSO Q2345+007. The current evidence suggests that this double QSO results from the gravitational lensing effects of a large compact mass at z = 1.49. If so, this early formation of compact structure is not compatible with many forms of dark matter. With the improved resolution of the HST we will be able to test the lensing hypothesis by a} measuring the morphologies and colors of the candidate cluster galaxies {including a previously identified galaxy projected 1.5" from the fainter QSO image image} and b} searching for statistical distortions among faint blue background galaxies. These new data will let us significantly improve our arc selection and ellipticity measurements, thus enabling construction of a reliable weak lensing mass map. Because this lens is at cosmological redshift, this will be a strong test of mass assembly scenarios and the nature of dark matter.

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