Further spectroscopic observations of the QSO PKS 0528 - 250
Open Access
- 1 May 1984
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 208 (1) , 167-178
- https://doi.org/10.1093/mnras/208.1.167
Abstract
We have re-observed the spectrum of the QSO PKS 0528 – 250 with about 2 Å FWHM resolution between 4580 and 5500 Å to check the reality of the many weak unidentified lines that had been suspected longward of the predicted wavelength for Lα emission. With the improved data we have rejected 10 of the unidentified lines but added 11 new ones, most of which we can attribute to C IV. Only one feature, which appears in both spectra, remains difficult to identify. In the autocorrelation function of the new spectrum there are two peaks due to the C IV doublet, further demonstrating that weak lines of this ion are prevalent in our spectrum. However the corresponding Lα absorption often is missing. We estimate the emission redshift to be zem = 2.767 ± 0.002.Keywords
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