Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...417l..57m&link_type=abstract
Astrophysical Journal Letters v.417, p.L57
Astronomy and Astrophysics
Astronomy
8
Cosmology: Gravitational Lensing, Galaxies: Quasars: Absorption Lines, Galaxies: Quasars: Emission Lines, Galaxies: Quasars: Individual Alphanumeric: 0957+561
Scientific paper
Test runs with a new data processing software system on archival spectra obtained by the International Ultraviolet Explorer (IUE) reveal high-excitation emission lines in the gravitationally lensed binary quasar 0957+561. The lines of O VI λλ1031,1037 and S VI λ2933,945 are readily seen in a single 390 minute, low-dispersion IUE exposure, when calibrated with the New Spectral Image Processing System (NEWSIPS). Coaddition of 10 exposures, as processed by NEWSIPS, followed by the application of a five-point smoothing filter, allows clear detection of the additional emission of C III λ978, N II λ992, S IV λλ1063-1073, N II λ1084, Fe III (UV1; λ1125), and N V λ1238. These identifications assume rest wavelengths consistent with the z = 1.41 redshift of the lensed quasar. In addition, we find a strong absorption that can be attributed to H I Lyman-βλ1017 with a redshift consistent with a previously reported damped Lyman-α absorption system at z = 1.3911, which is probably associated with intervening gas near the quasar (Turnshek & Bohlin 1993). Another absorption feature appears to be due to Si II λλ1190,1193 in the halo of an intervening galaxy at z = 1.38. Finally, the strong discontinuity in the continuum at the Lyman limit λ912 is appropriate to absorption that corresponds to the Lyman-α and Lyman-β absorption line system at z = 1.3911. These first results suggest that NEWSIPS is capable of disclosing much previously unrecognized information that is contained in the nearly 100,000 ultraviolet spectra currently in the IUE Archive, especially in regions of the spectra that are underexposed.
Bruhweiler Fred C.
de La Pena Mauricio
Kazanas Demos
Kondo Yoshihiko
Maran Stephen P.
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