An apparent gravitational lens with an image separation of 2.6 arc min

Details An apparent gravitational lens with an image separation of 2.6 arc min An apparent gravitational lens with an image separation of 2.6 arc min

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..142t&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 8, 1986, p. 142-144.

Other

54

Emission Spectra, Gravitational Lenses, Quasars, Magnesium, Red Shift, Spectral Line Width

Scientific paper

Observations are reported which confirm Paczynski's 1986 speculation that the previously known (Arp and Hazard, 1980) pair of 19th magnitude quasars 1146+111B,C are actually two images of a single object produced by a gravitational lens. The image split is 157 arcsec, more than 20 times greater than any previously reported, thus indicating an exceptionally massive lensing object. The data supporting the lens hypothesis are remarkably similar, high signal-to-noise, moderate resolution spectra of the two components. Both spectra show strong Mg II 2798-angstrom emission at z = 1.012 plus or minus 0.001 with indistinguishable redshifts (delta v = 126 plus or minus 309 km/s), widths (FWHM = 64 plus or minus 4 angstroms) and detailed profile shapes. Both spectra also show broad troughs at 6180 angstroms and several weaker continuum features. Neither object exhibits the O II 3727-A forbidden line which is frequently strong in Mg II emission objects. If the foreground galaxy clustering apparent in a deep R band charge-coupled device image proves insufficient to explain the large image splitting, other possibilities such as massive dark objects (e.g. a black hole of about 10 to the 15th solar masses) or a cosmic string may be indicated.

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