1994A&A...291..392D

We have performed integral field spectroscopy of three radio-loud moderate redshift quasars with the TIGER instrument at the Canada France Hawaii Telescope under subarcsecond seeing. We observed TON 616, 4C 37.43 and PKS 2251+113 in the Hβ-[OIII]λ4959-5007 wavelength region, and 4C 37.43 also in [OII]. We present for each object the reconstructed image in the [OIII] lines and in the continuum, the [OIII] image deconvolved for seeing effects, the [OIII]/Hβ intensity ratio, and the velocity field in [OIII]. In all objects, we find that the ionized gas is not smoothly distributed ; besides the envelopes in which the quasars are embedded, large blobs of gas are present a few arcseconds from the quasar, and velocity fields are rather chaotic. We discuss in detail the velocity field of TON 616, and attempt to fit it with one or two rotating disks. The possibility that the west region of this nebulosity is a companion galaxy, as suggested by the observed velocity field, is discussed. In 4C 37.43, we observe that the velocity of the gas in the two main structures is smooth, possibly suggesting here also the presence of a companion galaxy. The structure of PKS 2251+113 is more chaotic and does not suggest any overall cohesion in the velocity field.