IUE observations of the high redshift QSO Q1101 - 264
Open Access
- 1 February 1981
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 194 (2) , 353-358
- https://doi.org/10.1093/mnras/194.2.353
Abstract
We present low-resolution spectral observations of the high redshift (zem = 2.143) QSO Q1101 − 264 obtained with the IUE satellite. We find the QSO was 18 ± 5 per cent brighter, with similar spectral slope, on 1978 November 19 than on 1979 March 10. A sharp break in the spectrum near λ 2590 is explained as the Lyman discontinuity and blend of the higher Lyman lines at the redshift of the richest absorption system identified in the optical region, zabs = 1.8387. There is no suggestion at all of a break at or near the Lyman limit corresponding to the emission line redshift. Several strong absorption lines can be identified with individual Lyman lines in the zabs = 1.8387 system. From the equivalent widths of these lines and the low residual in the Lyman continuum we deduce 5 × 1017 cm−2 < N(H0) ≲ 2 × 1019 cm−2. We also find evidence of galactic Mg II absorption and lines of other possible absorption systems, but at the present resolution most lines probably are unresolved blends.Keywords
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