Tridimensional Spectroscopic Observation of the Interacting System NGC 7592

Abstract

Abstract We performed a tridimensional spectroscopic study of NGC 7592, an infrared-luminous interacting system of three galaxies, one of which contains a Seyfert 2 nucleus. Narrow-band images of $\mathrm{H}\alpha$ and [O iii] were obtained using an imaging Fabry–Perot interferometer with a tunable filter. An area-spectroscopic observation was also made by a slit scan in a direction perpendicular to the slit. The Seyfert nucleus was found to be surrounded by a knotty star-forming region of disk- or ring-shape. Along the axis of the disk or ring, a highly-ionized bipolar gaseous region was identified. From kinematical analyses, it has been suggested that this system is composed of two galaxies; one apparent nucleus is considered to be a giant H ii region belonging to one galaxy. This result is supported by the morphological properties in near-infrared. Further, it has been suggested that one galaxy is an early-type spiral, whereas the other is a late-type one, and the two galaxies show a marked difference in the distribution of the star-forming regions within each. The cause of the difference was argued in relation with the dynamical perturbation between the two galaxies.