ZwCl 8193 BCG

Description

ZwCl 8193 BCG is an elliptical galaxy situated within a rich galaxy environment. Its appearance is disturbed, indicating that it is undergoing multiple ongoing galaxy mergers. Evidence of a tidally disrupted galaxy exists in the outskirts, based on clumpy bright far-ultraviolet and hydrogen alpha emission arranged in a spiral formation. Optical and 3 μm imaging reveal a nuclear bulge. The total infrared star formation rate is estimated at 59 per year, and a possible double nucleus is present. The galaxy hosts an active galactic nucleus (AGN) with an estimated radio power of 25.29 W Hz−1. A radio source originally associated with the BCG, B3 1715+425, was later reclassified as a tidally stripped radio galaxy or a nearly naked black hole located 8.5 kiloparsecs from the BCG's central nucleus; tidal forces from the interaction likely pulled away the galaxy's outer portion, leaving only a small remnant. The BCG's own radio luminosity at 5 GHz is 41.61 ± 0.005 erg s−1. Detections of molecular hydrogen were reported, with a total molecular mass less than 4.3 × 10^10 and a molecular line luminosity of approximately 1.1 ± 0.1 × 10^41 erg s−1. A carbon oxide line survey found cold molecular gas, with line positions of -14 ± 20 km/s and line widths of 242 ± 65 km/s. The dust mass is calculated as 3.8 × 10^7. One hydrogen-alpha emission blob is centered on the BCG. A central supermassive black hole mass of 10.04 ± 0.05 has been calculated from its K-band bulge luminosity.