Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....66..343d&link_type=abstract
Astronomy and Astrophysics, vol. 66, no. 3, June 1978, p. 343-354.
Physics
5
Absorption Spectra, Line Spectra, Quasars, Red Shift, Cloud Physics, Seyfert Galaxies, Statistical Tests
Scientific paper
Line locking refers to the superposition of a spectral feature originating in the emission region of a QSO or in an absorbing cloud at a redshift zi upon another spectral feature produced in a cloud at a lower redshift zj. For this superposition to be observed, the rest wavelength (lambdan) of the line or edge at zi is redshifted to that (lambdam) of the feature originating in the cloud at redshift zj, as seen in the rest frame of the latter. When this condition is met, the following relation holds: (1 + zi) / (1 + zj) = lambdam/lambda sub n. Previous statistical investigations of line locking in QSO spectra are reviewed, a statistical test is applied to a modified QSO sample as well as to randomly generated data, and factors which may bias the QSO sample are considered. It is shown that the previously discovered peak centered at (1 + zi)/(1 + zj) = 1.11 is at least at the 5-sigma level of significance, that the probability for chance occurrence of this peak is of the order of 1 in 100,000, and that the position of the peak corresponds to a preferred velocity difference of 0.1c between the emission-line region and absorbing cloud of the QSOs concerned.
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