UM 425 - A new gravitational lens candidate

Details UM 425 - A new gravitational lens candidate UM 425 - A new gravitational lens candidate

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338l...1m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 338, March 1, 1989, p. L1-L4. Research supported by California In

Astronomy and Astrophysics

Astrophysics

56

Gravitational Lenses, Quasars, Stellar Spectra, Astronomical Spectroscopy, Imaging Techniques, Red Shift

Scientific paper

The discovery of a probable gravitational lens associated with the quasar UM 425 = QSO 1120+019 is reported. BVR images of the object were obtained with a CCD using a 1.5-m telescope in March, 1987. Three close companions were observed around the bright image of the quasar. Follow-up spectroscopy suggests that the brightest companion has the same emission lines as the quasar. The velocity difference between the two brightest components from the cross-correlation technique is shown to be 200 + or - 100 km/s and is consistent with zero. Subtracting a scaled spectrum of the brighter component from the brightest companion leaves a residual which is interpreted as the spectrum of a lensing galaxy at a redshift of about 0.6.

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