We present the serendipitous discovery of a projected pair of quasi-stellar objects ( QSOs ) with an angular separation of \Delta \theta = 4.50 arcsec .
The redshifts of the two QSOs are widely different : one , our programme target , is a QSO with a spectrum consistent with being a narrow line Seyfert 1 AGN at z = 2.05 .
For this target we detect Lyman- \alpha , C iv , and C iii ] .
The other QSO , which by chance was included on the spectroscopic slit , is a Type 1 QSO at a redshift of z = 1.68 , for which we detect C iv , C iii ] and Mg ii .
We compare this system to previously detected projected QSO pairs and find that only about a dozen previously known pairs have smaller angular separation .