Further spectroscopic observations of the QSO PKS 0528-250

Details Further spectroscopic observations of the QSO PKS 0528-250 Further spectroscopic observations of the QSO PKS 0528-250

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..167c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 1, 1984, p. 167-178.

Astronomy and Astrophysics

Astronomy

14

Astronomical Spectroscopy, Quasars, Absorption Spectra, Autocorrelation, Carbon, Emission Spectra, Line Spectra, Lyman Alpha Radiation, Red Shift, Spectral Resolution, Spectrum Analysis

Scientific paper

The spectrum of the QSO PKS 0528-250 was reobserved with about 2 A FWHM resolution between 4580 and 5500 A, to check the reality of the many weak unidentified lines that had been suspected longward of the predicted wavelength for L-alpha emission. With the improved data, 10 of the unidentified lines have been rejected but 11 new ones have been added, most of which can be attributed 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 the observed spectrum. However, the corresponding L-alpha-absorption often is missing. The emission redshift is estimated to be z(em) = 2.767 + or - 0.002.

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