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High-resolution imaging with bad seeing: PKS 1610-771 as a test case.

In a previous issue of The Messenger (Courbin et al., 1996), we presented NTT subarcsecond images of the luminous quasar PKS 1610-771, together with its spectrum. The analysis of the data (see also Courbin et al., 1997) leads to the plausible conclusion that the quasar is heavily obscured by dust. PKS 1610-771 has recently been observed in the infrared, but under much poorer seeing conditions (final frame with a FWHM of 1.66′′). We use these data to derive the infrared photometry of the quasar and also to detect the IR counterparts of the faint fuzzy objects surrounding the QSO, which were originally discovered in the optical. This is achieved by using the new deconvolution and co-addition algorithm developed by Magain et al. (1997a, b) to combine 6 individual K ′ images. Since the high-resolution optical images of PKS 1610-771 can provide a check of the co-addition results, we use these data as an example to present a new way of improving spatial resolution, based on the simultaneous deconvolution of several images of the same field.