The correlation between the absolute magnitudes of quasi-stellar objects and the velocities of ejected gas - A consequence of observational selection

Details The correlation between the absolute magnitudes of quasi-stellar objects and the velocities of ejected gas - A consequence of observational selection The correlation between the absolute magnitudes of quasi-stellar objects and the velocities of ejected gas - A consequence of observational selection

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93..382p&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 382-386.

Astronomy and Astrophysics

Astrophysics

1

Absorption Spectra, Astronomical Spectroscopy, Quasars, Stellar Luminosity, Stellar Magnitude, Line Spectra, Red Shift

Scientific paper

An earlier analysis by Perry and O'Dell (1978) suggests the existence of a highly significant correlation between the absolute visual magnitudes of QSOs and the inferred ejection velocities of redshifted absorption systems. This apparent correlation appears to be attributable to two major selection effects: (1) low-luminosity, high-redshift QSOs are underrepresented in existing samples of well-observed QSOs, and (2) the range of possible ejection velocities which can be observed varies with redshift such that (a) only large ejection velocities have been observed in high-z QSOs and (b) because of the intrinsic distribution of absorption systems, small ejection velocities are preferentially detected in lower redshift QSOs. Furthermore, analysis of a fairly homogeneous sample of QSO absorption spectra suggests that the apparent persistence of the correlation in Perry and O'Dell's redshift-restricted samples is fortuitous. While radiation-pressure-driven ejection in QSOs may be important, the existence of a correlation between ejection velocities and present-epoch V-band luminosities is doubtful.

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