Abstract

This dissertation contains multiwavelength observational projects on collisional ring galax­ ies. active galactic nuclei (AGNs). and neutral hydrogen observations of the collisional ring galaxy Arp 118 (an interacting pair NGC 11-14/1143). I have demonstrated in my dissertation research that: starburst knots of individual colli­ sional ring gala.xies cluster around the same, very young age suggesting that their formation was recently triggered by a coherent event all around the ring and strongly supports their pro­ duction as a result of the passage of a radial density wave: the atomic and molecular emission in the strongly interacting gala.xy .\rp 118 appears to be very asymmetrically distributed such that the .WV region of the gala.xy is mainly atomic hydrogen, whereas the SE region has an interstellar medium which is ~94% molecular hydrogen. One possiblity is that in the SE region there is a rapid conversion of HI to H). which may be a result of the highly off-center collision between .\GC 1144 and .\GC 1143: and the global far-infrared colors of Seyfert galaxies may be linked to their radio morphologies.

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