0 Assigned ID: 5419 ----- Attempting Submission 1 (Tue Mar 26 14:12:06 GMT 2024) ----- There has been major progress recently in the study of quasar absorption outflows and their potential contribution for AGN feedback. HST spectral observations of the 500A-1050A rest-frame (hereafter, EUV500) in medium redshift objects (z~1) uncovered a rich phenomenology of absorption troughs. The quality and quantity of EUV500 diagnostic troughs allow us to probe the very high ionization phase, which carries 90% or more of the outflowing material, as well as determine the distance of most outflows from the central source (R). The first objective is impossible to achieve with the thousands of available ground-based spectra, and R can be measured in only ~1% of them. The EUV500 effort yielded the most energetic outflows measured to date with enough kinetic luminosity to be major agents of AGN feedback processes. The HST spectral UV archive includes observations of more than 1000 quasars. These observations were taken mainly for studying intervening absorption systems, and quasar outflows detected in these spectra were rarely analyzed. WE PROPOSE an archive program to study the EUV500 outflows found in these spectra. Based on previous studies, we expect to find 20-30 very high ionization outflows (tripling the existing sample), and 10-15 outflows with measurable distance (doubling the existing sample). PI Dr. Arav published several refereed papers on analyzing COS data of quasar outflows, including on a similar quasar outflows: Arav et al. 2020, APJS 247:37 HST/COS Observations of Quasar Outflows in the 500A-1050A Rest Frame. I. The Most Energetic Outflows in the Universe and Other Discoveries The Co-I team has substantial expertise in both the data and science of this proposal: Dr Jerry Kriss: An expert on COS data and in the analysis of AGN outflows based on COS data. Dr. Korista is an AGN expert, with several publications on quasar and Seyfert outflows involving HST UV spectral observations. Dr. Xinfeng Xu, has published, three papers from HST GO-14777, which targeted similar quasar outflows with COS observations, including Xu et al., 2020a,b. Dr. Dehghanian is an expert on Cloudy photoionization simulations, which are vital for this project. Supermassive Black Holes and Active Galaxies 0 false false true false false false false SUPPORTED