0 Assigned ID: 6612 ----- Attempting Submission 1 (Thu Apr 10 19:04:53 GMT 2025) ----- 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 500 A-1050 A 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 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 one similar quasar outflow: 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 Dr Jerry Kriss: An expert on COS data and in the analysis of AGN outflows based on COS and STIS data. He published many papers analyzing HST UV spectra and X-ray data of Seyfert outflows, e.g., Kriss, G. A.; Mehdipour, M.; Kaastra, J. S.; Arav, N. et al. HST/COS observations of the newly discovered obscuring outflow in NGC 3783 2019, A&A, 621A, 12 Co-I Mayank Sharma is an expert in Cloudy photoionization simulations and multiwavelength analysis of AGN outflows. See Sharma, Mayank, et al. The Astrophysical Journal 983.1 (2025): 31. and Sharma, Mayank, et al. Astronomy & Astrophysics 693 (2025): A254. Supermassive Black Holes and Active Galaxies 0 false true false false false false false SUPPORTED