Compact companions to QSOs

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Companion Stars, Quasars, Stellar Spectra, Emission Spectra, Galactic Nuclei, Red Shift

Scientific paper

Three cases of nearly stellar objects found at small angular separations from low-redshift QSOs are discussed. Spectra show that all three have redshifts within 200 km/sec of those of their respective QSOs and that the one near PKS 2135-147 almost merits being called a QSO in its own right. It is argued that the actual separations of these compact objects from the QSOs are of the same order as the projected separations, i.e., a few kpc, that similar compact objects may well exist in the neighborhoods of a significant fraction of all low-redshift QSOs, and that the presence of these close companions is related to the QSO activity. A plausible, self-consistent case can be made for regarding such objects as remnant cores of galaxies that have interacted with the galaxies in which the QSOs reside and for supposing that the QSO activity results from fresh material being brought into the nuclei of these galaxies during the interaction. Some of the consequences of this picture are briefly discussed.

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