Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg

We present the results of a large multi-wavelength follow-up campaign Tidal Disruption Event (TDE) \dsg, focusing on low to high resolution optical spectroscopy, X-ray, and radio observations. The galaxy hosts super massive black hole mass $\rm (5.4\pm3.2)\times10^6\,M_\odot$ careful analysis finds no evidence for presence an Active Galactic Nucleus, instead TDE host shows narrow emission lines that likely arise from star formation activity. transient is luminous in X-rays, radio, UV optical. X-ray becomes undetected after $\sim$125 days, luminosity density starts decay at frequencies above 5.4 GHz by $\sim$180 days. Optical line signatures are up $\sim$250 days discovery transient. medium spectra show traces absorption we propose originate self-gravitating debris streams. At late times, $\sim$200 Fe appear spectra. was previously classified as N-strong, but subtraction galaxy's stellar contribution, find these N spectrum, even though O Bowen detected. observed properties fully consistent with detection inner regions cooling accretion disc. this central engine seen inclination (i.e., poles).