We obtained MMT spectra of the gravitational lens candidate UM425 to compare the redshifts and line profile structures of lens components A and B , which are separated by \sim 6 \farcs 5 .
The CIV \lambda 1550 Å emission in both A and B exhibits Broad Absorption Line ( BAL ) structure , consistent with the earlier detection of BAL structure in OVI \lambda 1033 Å and NV \lambda 1240 Å that was found with the International Ultraviolet Explorer ( IUE ) in component A. Cross-correlation of the spectra of A and B using emission lines of CIV \lambda 1550 Å , HeII \lambda 1640 Å , NIII \lambda 1750 Å , CIII \left . \right ] \lambda 1909 Å and MgII \lambda 2800 Å reveals a difference in the redshifts of A & B .
However , the detailed BAL line profile structure found in spectra of A & B are strikingly similar to one another , which suggests the system is lensed .
The spectra of A & B also indicate significant dust extinction , which we base on the presence of the \lambda 2175 Å absorption feature in the rest frame of the QSO ( z _ { QSO } = 1.47 ) .
This feature is commonly seen in galactic sources , but is not generally observed in QSO spectra .
Our spectra show the presence of the \lambda 2175 Å absorption feature in spectra of both images associated with the gravitational lens UM425 .
Based upon the strong similarity of BAL line profile structure exhibited by UM425A & B , particularly the presence of the \lambda 2175 dust absorption feature in spectra of both images , we conclude that UM425 is a gravitational lens .