0 Assigned ID: 3490 ----- Attempting Submission 1 (Fri Mar 25 20:05:41 GMT 2022) ----- We propose an archival research program with HST to investigate the UV spectral signatures of X-ray ultra-fast outflows (UFOs) in active galactic nuclei (AGN). The UFOs, with relativistic outflow velocities, are a crucial component of AGN outflows. These energetic winds have adequate kinetic luminosity to play an important role in AGN-galaxy feedback. There are, however, significant gaps in our understanding of UFOs from X-ray studies alone. High-resolution spectroscopy with HST of potential UV counterparts of X-ray UFOs can provide key additional physical information, such as their kinematics and ionization structure, which cannot be ascertained from the X-rays alone. For this archival study with HST we have selected a sample of suitable AGN, composed of two groups, which have previous reports of UFO detection in X-rays. We aim to investigate the multi-ionization-phase 'entrained UFO' model, which would provide a feasible explanation for the currently uncertain formation and structure of these ionized outflows in AGN, bridging small-scale UFOs to large-scale warm-absorber and molecular outflows. The PI (Dr. Missagh Mehdipour) and Co-I (Dr. Gerard Kriss) have extensive experience and expertise in study of AGN outflows and analyzing and modeling data from HST, XMM-Newton, NuSTAR, Swift, and Chandra. Data from our previous X-ray and UV campaigns, and successful ToO programs, have been extensively published: - Mrk 509 campaign with 16 refereed publications - NGC 5548 campaign with 9 refereed publications - NGC 7469 campaign with 6 refereed publications - NGC 3783 ToO programme with 5 refereed publications - NGC 3227 ToO programme with 2 refereed publications (1 submitted) Some of our relevant publications are: Mehdipour et al. 2022b ApJ, in press, arXiv:2202.08405 Mehdipour et al. 2022a ApJ, 925, 84 Mehdipour et al. 2021 A&A, 652, 150 Mehdipour et al. 2017, A&A, 607, A28 Mehdipour et al. 2015, A&A, 575, A22 Mehdipour et al. 2016, A&A, 588, A139 Kriss, G. et al. 2018a, ApJ, 853, 166 Kriss, G. et al. 2018b, ApJ, 859, 94 Dr. Mehdipour has expertise in X-ray/UV spectroscopy of ionized outflows in AGN, optical-UV-X-ray continuum modelling, and photoionization modelling. He has previously led projects on the studies of ionized outflows in AGN with Chandra, HST, XMM-Newton, and Swift. Most recently he published the discovery of a UV counterpart of an X-ray ultra-fast outflow in IRAS 17020+4544 with HST/COS (Mehdipour et al. 2022b). He is the PI of successful Swift proposals targeting a sample of AGN that has included triggers for transient obscuration in NGC 3783, NGC 3227, and Mrk 841. Dr. Mehdipour will carry out the main analysis and modelling of the HST grating spectra to determine the UV spectral signatures of ultra-fast outflows. Dr. Kriss is an expert in multi-wavelength observations of AGN. He has vast experience in HST analysis and modelling of UV absorption lines of different types of AGN outflows. He has previously published the discovery of a UV counterpart to an X-ray ultra-fast outflow in PG 1211+143 (Kriss et al. 2018a), and led the previous search for Lyman-alpha counterparts to X-ray ultra-fast outflows in a sample of AGN (Kriss et al. 2018b). Dr. Kriss will contribute to the modelling and interpretation of the HST spectra. Supermassive Black Holes and Active Galaxies 0 false true false false false false false SUPPORTED