BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Review: HST view of a multifarious landscape of winds in AGN DTSTART;VALUE=DATE-TIME:20230630T073000Z DTEND;VALUE=DATE-TIME:20230630T080000Z DTSTAMP;VALUE=DATE-TIME:20260306T081936Z UID:indico-contribution-191-948@cern.ch DESCRIPTION:Speakers: Missagh Mehdipour (Space Telescope Science Institute )\nWinds link the supermassive black holes at the heart of active galactic nuclei (AGN) to their environment. Combined high-resolution UV and X-ray spectroscopy is a crucial tool to advance our understanding of the origin and role of these outflows in AGN. I present results from recent studies i nvestigating the physical connection between different forms of outflows t hat have been found in AGN. I review the UV perspective of warm-absorber o utflows\, transient obscuring winds\, and the ultra-fast outflows (UFOs) u sing spectroscopy with the Hubble Space Telescope (HST). By deciphering th eir variability\, and mapping their ionization and kinematic structure\, n ew insights are gained on the formation and driving of the AGN outflows.\n \nhttps://indico.unina.it/event/61/contributions/948/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/948/ END:VEVENT BEGIN:VEVENT SUMMARY:Time Dependent Line Driven Disc Winds - X-ray Irradiation DTSTART;VALUE=DATE-TIME:20230630T084500Z DTEND;VALUE=DATE-TIME:20230630T090000Z DTSTAMP;VALUE=DATE-TIME:20260306T081936Z UID:indico-contribution-191-855@cern.ch DESCRIPTION:Speakers: Sergei Dyda (University of Virginia)\nLine driving i s a promising explanation for AGN winds as it provides both a launching me chanism and an explanation for the absorption and emission lines in spectr a. As the community moves towards multi-wavelength and multi-epoch observa tions\, our modelling of AGN systems must likewise follow suit to leverage these new capabilities. For line driving to be a viable acceleration mech anism two conditions must exist in the wind 1) The gas must be sufficientl y\, though not overly\, ionized by X-rays\, so that the gas can interact w ith the UV 2) The UV flux incident on the gas must be high enough to tran sfer sufficient momentum to overcome gravity. We present novel simulations of AGN disc winds using time-dependent\, multi-frequency radiation hydrod ynamics focusing on the problem of gas ionization\, where we model both th e X-ray and UV radiation fields. We consider a suit of models for gas/X-ra y interactions and identify the conditions on scattering and absorption op acities where wind self-shielding can operate and allows line driving to l aunch winds.\n\nhttps://indico.unina.it/event/61/contributions/855/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/855/ END:VEVENT BEGIN:VEVENT SUMMARY:Time variability of ultra-fast outflows in BAL quasars using SALT: C IV equivalent width analysis DTSTART;VALUE=DATE-TIME:20230630T083000Z DTEND;VALUE=DATE-TIME:20230630T084500Z DTSTAMP;VALUE=DATE-TIME:20260306T081936Z UID:indico-contribution-191-854@cern.ch DESCRIPTION:Speakers: Aromal Pathayappura (Inter-University Centre for Ast ronomy and Astrophysics (IUCAA)\, Pune)\nWe present the results of a South African Large Telescope (SALT) spectroscopic monitoring to study the time variability of C IV BALs in a sample of 64 quasars showing ultra-fast out flow (UFO) with v$_{outflow\,max}$ > 15000 kms$^{-1}$ in their spectra. We also created a sample of non-BAL quasars from SDSS DR12 matched in redshi ft and luminosity. Our UFOs show more blueshift of CIV BEL than that of n on-BALs in the control sample. The fraction of “highly variable” BALs (with fractional change in equivalent width\, $\\frac{\\Delta W}{W}$ > 2) in our sample is considerably higher than that reported for the general BA L population. We find that the strength of variability increases with time \, and for each source\, SALT observations enabled us to look at the varia bility at different time scales ( from as short as < 0.5 years to longer t ime scales of > 7.5 years) in detail. We also show that the fraction of hi ghly variable BALs increases with time\, and for these BALs\, the BAL stre ngthening time scale is found to be considerably shorter than the weakenin g time scales. We found no correlation between BAL variability and quasar properties such as black hole mass and Eddington ratio but found a moderat e correlation with bolometric luminosity for time scales < 2 years. Based on the properties of C IV absorption\, we find weak\, high-velocity\, shal low\, and low-width BALs tend to show more variability. We also classified the BALs according to their absorption profile shape and found detached p rofiles at high velocities showing large variations irrespective of the st rength of absorption. We conclude both the low-equivalent width and high-v elocity nature of BALs are equally important for excess BAL variability. I nterestingly our results suggest that the presence of a distinct BAL troug h at lower velocities increases the chances of observing a highly variable UFO BAL if present. Finally\, using photometric light curves\, we show th at the continuum flux variations may be responsible for the observed BAL v ariability in the majority of the sources where the EW of the BAL decrease s as the continuum increases.\n\nhttps://indico.unina.it/event/61/contribu tions/854/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/854/ END:VEVENT BEGIN:VEVENT SUMMARY:Review: AGN outflows in X-ray DTSTART;VALUE=DATE-TIME:20230630T080000Z DTEND;VALUE=DATE-TIME:20230630T083000Z DTSTAMP;VALUE=DATE-TIME:20260306T081936Z UID:indico-contribution-191-910@cern.ch DESCRIPTION:Speakers: Elisa Costantini (SRON Netherlands Institute for Spa ce Research)\nIt is clear that an important part of the AGN self sustenanc e\, as well as its connection with the surrounding\, is constituted by pow erful outflows\, detected in a large fraction of objects. Winds can be con sidered as the messenger in the communication between the AGN and the gala xy. \nDifferent wind components co-exist in the same source\, often with d rastically different properties in terms of carried mass and energy. \nIn this talk I will review X-ray winds and their variability as a function of the central engine flux. Several methods are in place to extract importa nt information on the physics and geometry of the outflowing gas. This in turn provide important diagnostic on AGN feedback.\n\nhttps://indico.unina .it/event/61/contributions/910/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/910/ END:VEVENT END:VCALENDAR