The detection of the lambda 2175 A feature, and further analysis of the BAL line profile structure in the gravitational lens candidate UM425

Details The detection of the lambda 2175 A feature, and further analysis of the BAL line profile structure in the gravitational lens candidate UM425 The detection of the lambda 2175 A feature, and further analysis of the BAL line profile structure in the gravitational lens candidate UM425

1997-07-23

arxiv.org/abs/astro-ph/9707254v1

Astronomy and Astrophysics

Astrophysics

13 pp, 2 figs, Accepted by ApJL

Scientific paper

10.1086/310903

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 ~6.5". The CIV lambda 1550 A emission in both A and B exhibits Broad Absorption Line (BAL) structure, consistent with the earlier detection of BAL structure in OVI lambda 1033 A and NV lambda 1240 A 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 A, HeII lambda 1640 A, NIII lambda 1750 A, CIII] lambda 1909 A and MgII lambda 2800 A 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 A 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 A 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.

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