Wide Separation Quasars: Pairs or Lenses?

Details Wide Separation Quasars: Pairs or Lenses? Wide Separation Quasars: Pairs or Lenses?

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..123g&link_type=abstract

Chandra Proposal ID #01700656

Computer Science

Chandra Proposal Id #01700656

Scientific paper

We propose to image the wide (7'') separation quasar pair Q2345+007 to determine whether it is a binary quasar or a gravitational lens and to probe the nature of the lensing matter. With nearly identical optical spectra and identical redshifts, this quasar pair remains the most intriguing example of an observed configuration requiring the presence of massive, concentrated dark matter acting as a gravitational lens. If the quasar pair Q2345+007 proves consistent with a lens in X-rays, we expect to constrain, detect, or characterize the most compelling ``dark cluster'' candidate known. If not, our observation will lend credence to the binary interpretation, showing Q2345+007 to be a bizarre case of virtually identical spectral energy distributions in quasars separated by about 3Mpc.

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