Abstract
A strong X-ray source only 8'' from the nucleus of the Seyfert 2 galaxy NGC 7319 in Stephan's Quintet has been discovered by Chandra. We have identified the optical counterpart and show that it is a QSO with ze = 2.114. It is also an ultraluminous X-ray source with LX = 1.5 × 1040 ergs s-1. From the optical spectra of the QSO and the interstellar gas of NGC 7319 together, we show that it is very likely that the QSO is interacting with the interstellar gas.
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