BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:XMM-Newton Highlights of Black Hole Variability DTSTART;VALUE=DATE-TIME:20230628T090000Z DTEND;VALUE=DATE-TIME:20230628T091500Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-871@cern.ch DESCRIPTION:Speakers: Schartel Norbert (ESA)\nWith about 380 refereed pape rs published each year\, XMM-Newton is one of the most\nsuccessful scienti fic missions of ESA ever. Observation of AGNs and their variability is one of the main research fields covered by the observing program of the missi on. The talk highlights XMM-Newton contributions to our current view of Bl ack Holes variability. XMM-Newton observations provide a unique opportunit y to study the vicinity of Supermassive Black Holes (SNBH) and constrain the understanding of the underlying accretion physics. The main focus of t he talk will be the discussion of recent scientific highlight results base d on XMM-Newton observations of SMBHs.\n\nhttps://indico.unina.it/event/61 /contributions/871/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/871/ END:VEVENT BEGIN:VEVENT SUMMARY:AGN in the La Silla QUEST Variability Survey DTSTART;VALUE=DATE-TIME:20230628T094500Z DTEND;VALUE=DATE-TIME:20230628T100000Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-812@cern.ch DESCRIPTION:Speakers: Paolo Coppi (Yale University)\nThe La Silla QUEST (L SQ) supernova survey ran for 6 years on the ESO 1m Schmidt telescope at La Silla Chile\, using a large CCD array to replace the photographic plate o f the Schmidt. The survey imaged ~1000 degrees twice per night using a sin gle broad V band filter\, covering a total area of ~25\,000 square degrees from declination ~ -80 to +25 degrees. The survey magnitude limit is V~21 in a single 60 second exposure\, with an average of ~200 visits for any g iven patch of sky and over one thousand square degrees of sky covered by m ore than 1000 visits. Systematic photometric errors from the current diffe rential photometry pipeline are at the 5-10 mmag level for bright point so urces on a good night\, with further improvements expected. The QUEST V fi lter can be absolutely calibrated against SDSS and PanSTARRS g+r data at t he percent level\, enabling LSQ\, for example\, to extend in time the SDSS Stripe 82 variability survey. Although principally designed to find super novae\, the strict survey cadence provides good logarithmic time coverage on timescales from ~30 minutes to ~years\, ideal for probing AGN variabili ty and constraining\, for example\, the parameters of a Damped Random Walk model. We present some highlights of LSQ AGN science. The LSQ dataset sho uld prove useful as a training set to prepare for LSST. Over 1 million LSQ -selected AGN candidates will also be followed up by the upcoming ESO 4MOS T survey.\n\nhttps://indico.unina.it/event/61/contributions/812/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/812/ END:VEVENT BEGIN:VEVENT SUMMARY:Review: Spectroscopic surveys for AGN time-domaine science DTSTART;VALUE=DATE-TIME:20230628T080000Z DTEND;VALUE=DATE-TIME:20230628T083000Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-926@cern.ch DESCRIPTION:Speakers: Paulina Lira (Universidad de Chile)\nhttps://indico .unina.it/event/61/contributions/926/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/926/ END:VEVENT BEGIN:VEVENT SUMMARY:STAR-X: a next-generation X-ray and UV explorer to study the restl ess nature of AGN DTSTART;VALUE=DATE-TIME:20230628T111500Z DTEND;VALUE=DATE-TIME:20230628T113000Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-813@cern.ch DESCRIPTION:Speakers: Roberto Gilli (INAF - OAS Bologna)\nThe Survey and T ime-domain Astrophysical Research eXplorer (STAR-X\;\nhttp://star-x.xrayde ep.org) is a Medium Explorer class mission\nrecently selected for a compet itive NASA Phase A study. It comprises a\nwide-field\, high-throughput\, h igh-angular-resolution X-ray Telescope\n(XRT) and a complementary UV Teles cope (UVT) on an agile spacecraft\nbus. STAR-X will conduct high-cadence\, deep-and-wide surveys\, and\nrespond rapidly to transient events discover ed by other observatories\nsuch as LIGO\, Rubin/LSST\, Roman/WFIRST\, and SKA.\n\nThe science theme for the mission is “to study the fast\, furiou s and\nforming Universe.” In this talk I will first present an overview of\nthe mission concept and observing capabilities\, and then focus on the \nkey "furious" science pillar\, which will explore feeding and growth of\ nmassive black holes through sensitive\, time-domain studies.\n\nSTAR-X wi ll uniquely probe the physics of rapid accretion that allowed\nthe formati on of the first supermassive black holes\, and will catch\ntransient\, ext reme black hole feeding events\, such as Tidal Disruption\nEvents (TDEs). Critically\, STAR-X will discover TDEs in the X-ray\nband\, providing dire ct evidence for newborn accretion disks. Also\, by\nmonitoring their X-ray and associated UV emission\, STAR-X will\nconstrain the timescales of dis k formation and their\nevolution. Finally\, STAR-X will perform detailed r everberation mapping\nof AGN distributed over a broad range of Eddington r atios\, revealing\nhow the accretion flow geometry depends on the accretio n rate.\n\nhttps://indico.unina.it/event/61/contributions/813/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/813/ END:VEVENT BEGIN:VEVENT SUMMARY:Continuous X-ray monitoring of the south ecliptic pole with eROSIT A DTSTART;VALUE=DATE-TIME:20230628T110000Z DTEND;VALUE=DATE-TIME:20230628T111500Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-814@cern.ch DESCRIPTION:Speakers: Teng Liu (Max Planck Institute for Extraterrestrial Physics)\nThe eROSITA all-sky surveys (eRASS) continuously scan the sky \n along great circles crossing the ecliptic poles. This scanning strategy \n covers the full sky every six months and visits the ecliptic poles every \ nfour hours\, leading to much longer exposure time and much higher cadence \nat the ecliptic poles than the majority of the sky. Between Dec. 2019 \ nand Feb. 2022\, the eRASS surveys scanned the full sky more than four \nt imes and observed the ecliptic poles more than 4600 times\, with a total \ nexposure of more than 160ks at the ecliptic poles. Because of the long \n exposure near the confusion limit of eROSITA\, we treated the region \nwit hin 3 degrees of the south ecliptic pole (SEP) separately from the \nmain part of the eRASS surveys and detected X-ray sources with a \npipeline fin e-tuned for such crowed fields. We built a catalog with ~15k \nX-ray sourc es within 3 degrees of SEP (~8k within 1 degree) and \nidentified their mu ltiband counterparts from a few catalogs including \nCatWISE\, NSC-DR2\, S -CVZ\, and GAIA-DR3. Based on multiband colors\, we \nselected AGN from th em and used the AAOmega spectrograph onboard the AAT \ntelescope to follow them up. A large number of the X-ray sources exhibit \nsignificant variab ility\, including a few particular targets that are \npossibly tidal disru ption events\, AGN shutting down or ignition events\, \nor quasi-periodic oscillation cases. We study the normalized excess \nvariance and power spe ctral densities of AGN with X-ray light curves\, \nmeasure their optical p roperties\, e.g.\, black hole mass\, using optical \nspectra\, and analyze the correlation between them.\n\nhttps://indico.unina.it/event/61/contrib utions/814/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/814/ END:VEVENT BEGIN:VEVENT SUMMARY:eROSITA Detection of Cloud Occultation Events in Seyfert AGN\, and Contributions for Clumpy-Torus models DTSTART;VALUE=DATE-TIME:20230628T104500Z DTEND;VALUE=DATE-TIME:20230628T110000Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-865@cern.ch DESCRIPTION:Speakers: Alex Markowitz (Nicolaus Copernicus Astronomical Cen ter\, Polish Academy of Sciences)\nRecent years have seen broad observatio nal support for the\ncircumnuclear gas around supermassive black holes to contain a clumpy\ncomponent. In the X-ray band\, individual clouds can ma nifest\nthemselves when they transit the line of sight to the X-ray corona \,\ntemporarily obscuring the X-ray continuum\, and indicating the\ncharac teristics and location of these clouds.\n\nThe eROSITA X-ray telescope abo ard Spectrum X/Gamma is performing\nmultiple all-sky X-ray surveys\, inclu ding monitoring a vast sample of\nAGN and galaxies. Such monitoring can a mplify rare cloud occultation\nevents\, allowing us to accumulate observat ional constraints for\nclumpy-torus models\, including cloud distribution and composition\nparameters.\n\nHere\, we discuss the first cloud occultat ion events detected in a\nSeyfert 1 galaxy by eROSITA: in this Seyfert\, t he soft X-ray flux\ndipped abruptly for $\\sim$ 10-18 months during 2020-2 021\, recovered\,\nbut then dropped a second time by Spring 2022. Our two- year\nmulti-wavelength follow-up campaign included X-ray/UV and ground-bas ed\noptical photometric and spectroscopic observations\, and confirmed tha t\nthe soft X-ray flux dips were caused by partial-covering obscuration\nb y two separate\, single compact clouds near the black hole.\nThe two trans iting clouds are consistent with neutral or lowly-ionized\ngas\, residing at radial distances commensurate with the optical Broad\nLine Region and t he inner dusty torus\, respectively.\n\nhttps://indico.unina.it/event/61/c ontributions/865/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/865/ END:VEVENT BEGIN:VEVENT SUMMARY:Review: AGN variability with eROSITA DTSTART;VALUE=DATE-TIME:20230628T100000Z DTEND;VALUE=DATE-TIME:20230628T103000Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-912@cern.ch DESCRIPTION:Speakers: Andrea Merloni ()\neROSITA (extended ROentgen Survey with an Imaging Telescope Array)\, the core instrument on the Russian-Ger man Spektrum-Roentgen-Gamma (SRG) mission has completed 4 scans of the ent ire sky with unprecedented sensitivity in the 0.2-8 keV energy range. I wi ll present an overview of the instrument capabilities\, the current status of the mission\, a few selected early science results focusing on the stu dy of the time domain properties of galactic nuclei.\n\nhttps://indico.uni na.it/event/61/contributions/912/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/912/ END:VEVENT BEGIN:VEVENT SUMMARY:Extreme variability in galactic nuclei detected with eROSITA DTSTART;VALUE=DATE-TIME:20230628T103000Z DTEND;VALUE=DATE-TIME:20230628T104500Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-869@cern.ch DESCRIPTION:Speakers: David Homan (Leibniz-Institut für Astrophysik Potsd am)\nThe eROSITA all-sky X-ray survey has provided the basis for a large-s cale search for extreme X-ray variability in extragalactic objects associa ted with accretion changes in AGN. We have combined the survey dataset wit h a multi-wavelength follow-up campaign of the most variable objects. The follow-up observations include optical spectroscopy and X-ray and UV obser vations. This presentation will cover the results of our search for extrem ely variable AGN based on at least four epochs of available eROSITA data. Our sample consists of ~2200 vetted extragalactic sources with significant X-ray changes. As part of our follow-up\, we have collected optical spect roscopic follow-up on ~350 objects\, including repeat spectroscopy for 40% of these. I will introduce our sample selection criteria\, statistics on the detected X-ray variability\, and the observed correlation with optical 'changing-look' behaviour. I will also briefly summarise some of the most interesting individual sources. Finally\, I will discuss our results in t he context of the link between extreme X-ray and optical variability and t he time scales involved in large-scale accretion changes around SMBHs.\n\n https://indico.unina.it/event/61/contributions/869/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/869/ END:VEVENT BEGIN:VEVENT SUMMARY:The search for variable AGN with Gaia DTSTART;VALUE=DATE-TIME:20230628T084500Z DTEND;VALUE=DATE-TIME:20230628T090000Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-810@cern.ch DESCRIPTION:Speakers: Maria Isabel Carnerero Martin (INAF-Osservatorio Ast rofisico di Torino)\nThe third release of Gaia data\, published on June 13 \, 2022\, includes not only astrometric and astrophysical parameters of di fferent types of sources\, but also several catalogues of variable sources . Among these\, the catalogue of Gaia variable AGN\, which is described by Carnerero et al. (2022). To identify the variable AGN\, we analyzed the l ight curves of more than 80 million sources observed by Gaia\, selecting 8 70 thousands of them compliant with requirements on their variability prop erties (structure function\, Butler and Bloom metrics\, fractional variabi lity)\, color indices\, astrometric parameters and others. The purpose was to create a variable AGN catalogue as pure as possible. More than 21\,000 of these 870 thousand sources are identified as variable AGN for the firs t time. For each source of the catalogue\, the Gaia multi-band light curve s and the values of a number of variability parameters have been included in the database. In view of the next Gaia DR4\, we are now implementing ne w variability parameters that will be published in the Gaia AGN variabilit y table. They will be useful to the community\, both for carrying out stat istical studies and for AGN classification with machine learning.\n\nhttp s://indico.unina.it/event/61/contributions/810/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/810/ END:VEVENT BEGIN:VEVENT SUMMARY:Review: Restless AGNs in the Legacy Survey of Space and Time DTSTART;VALUE=DATE-TIME:20230628T073000Z DTEND;VALUE=DATE-TIME:20230628T080000Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-906@cern.ch DESCRIPTION:Speakers: William Brandt (Penn State University)\nThe Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST)\, aiming to begin in early 2025\, will allow studies of the growing supermassive black hole s (SMBHs) in active galactic nuclei (AGNs) on a truly massive scale. After a brief review of the LSST from an AGN perspective\, I will describe the planned selection of tens of millions of AGNs using the LSST plus multiwav elength data\, including with variability techniques. I will then highligh t examples of exciting LSST AGN variability investigations including massi ve general AGN variability studies\, photometric and spectroscopic reverbe ration mapping\, microlensing of small-scale AGN structure\, transient SMB H fueling events\, and candidate binary SMBHs. I will end by briefly descr ibing the LSST AGN Science Collaboration (AGN SC)\, currently composed of about 160 members spanning the globe. The AGN SC aims to lead many of the described investigations and is preparing for science with the petabyte de luge of LSST data.\n\nhttps://indico.unina.it/event/61/contributions/906/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/906/ END:VEVENT BEGIN:VEVENT SUMMARY:AGN Variability: A ZTF perspective DTSTART;VALUE=DATE-TIME:20230628T083000Z DTEND;VALUE=DATE-TIME:20230628T084500Z DTSTAMP;VALUE=DATE-TIME:20261006T091117Z UID:indico-contribution-189-811@cern.ch DESCRIPTION:Speakers: Matthew Graham (Caltech)\nThe Zwicky Transient Facto ry (ZTF) has been surveying the visible sky above Dec = -30 on a 2-3 night cadence in $g$\, $r$\, and $I$ for the past five years. With a $5 \\sigma $ detection limit of $g = 20.5$\, this provides hundreds of thousands of n ightly real-time public alerts as well as well-sampled light curves for ov er 3 billion sources. This is an unparalleled data set for both anomaly de tection and population studies of many astrophysical classes but it has be en particularly fruitful for supermassive black holes: both the tens of ti dal disruption events found around quiescent systems but also detecting ne w types of phenomena in active systems. In this talk\, I will review what insights ZTF is providing into the AGN Zoo with changing state quasars\, a mbiguous nuclear transients\, and EM counterparts to stellar mass black ho le mergers as well as the more general properties of the AGN population.\n \nhttps://indico.unina.it/event/61/contributions/811/ LOCATION:Centro Congressi Federico II Aula Magna URL:https://indico.unina.it/event/61/contributions/811/ END:VEVENT END:VCALENDAR