Deep CCD images of 2345 + 007 - Lensing by dark matter

Details Deep CCD images of 2345 + 007 - Lensing by dark matter Deep CCD images of 2345 + 007 - Lensing by dark matter

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1274t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, June 1986, p. 1274-1278. Research supported by the University of Illinois.

Astronomy and Astrophysics

Astrophysics

43

Astronomical Spectroscopy, Charge Coupled Devices, Gravitational Lenses, Mass To Light Ratios, Missing Mass (Astrophysics), Quasars, Absorption Spectra, Data Reduction, Intergalactic Media, Line Spectra, Mass Distribution

Scientific paper

Deep CCD images of the lensed QSO 2345+007 taken in the blue, red, and near infrared show no galaxy between the QSO images to J = 25.5, R = 26, and I = 24.5 mag. There are a few 23.8 I mag galaxies within 10 arcsec of the QSO. Even if one of these field galaxies was near the line of sight to the QSO, there must be other objects of very high M/L assisting the lensing. Two absorption-line systems at z = 1.5, separated by 1000 km/s, are seen in the QSO spectra. The authors would have detected images of galaxies at z = 1.5, in the QSO vicinity. This is the strongest case, among the seven confirmed lensed QSOs, for lensing by dark compact objects. A nonluminous mass of 1013M_sun; is required.

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