BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:High-Frequency VLBI Studies of AGN Jets: A Collaborative Journey w ith Thomas DTSTART;VALUE=DATE-TIME:20250324T135500Z DTEND;VALUE=DATE-TIME:20250324T141000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-11@cern.ch DESCRIPTION:Speakers: PARASCHOS\, Georgios-Filippos ()\nOver the years\, o ur understanding of active galactic nuclei (AGN) has been significantly ad vanced through high-resolution observations enabled by very-long-baseline interferometry (VLBI). Under the mentorship of Thomas\, our work has focus ed on high-frequency VLBI imaging of γ-ray active AGN jets\, probing thei r structure\, variability\, and dynamics at the highest angular resolution s. By utilising global VLBI networks\, including the Global Millimetre VLB I Array and the Event Horizon Telescope\, we have traced the evolution of jet features on sub-parsec scales\, uncovering key insights into jet accel eration\, collimation\, and interaction with the surrounding medium. In my presentation I will showcase our collaborative research with Thomas and e mphasise the key insights we have uncovered in recent years.\n\nhttps://ev ents.mpifr-bonn.mpg.de/indico/event/425/session/0/contribution/11 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/11 END:VEVENT BEGIN:VEVENT SUMMARY:The Fast Variability of Sgr A* DTSTART;VALUE=DATE-TIME:20250324T164000Z DTEND;VALUE=DATE-TIME:20250324T170000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-10@cern.ch DESCRIPTION:Speakers: Dr. WITZEL\, Gunther (MPI für Radioastronomie)\nIn my talk I would like to give an overview of the multi-wavelength variabili ty studies of Sgr A* as they have been carried out for about 20 years now. In particular\, I will describe the evolution of the analytical tools and Thomas' role in their development. I conclude with some personal remarks about the 35 years that Thomas and I have known each other.\n\nhttps://eve nts.mpifr-bonn.mpg.de/indico/event/425/session/1/contribution/10 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/10 END:VEVENT BEGIN:VEVENT SUMMARY:Blazars\, Mentorship\, and the Journey of Discovery DTSTART;VALUE=DATE-TIME:20250324T132000Z DTEND;VALUE=DATE-TIME:20250324T133500Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-13@cern.ch DESCRIPTION:Speakers: Dr. TRAIANOU\, Thalia (IWR/MPIfR)\nScience advances not only through research but also through the guidance of dedicated mento rs. One such mentor is Thomas Krichbaum\, whose guidance has shaped many s cientific careers. As he approaches retirement\, this talk honors his inva luable mentorship and foundational contributions to very-long-baseline int erferometry (VLBI) and jet physics.\nIn my doctoral research with Thomas\, I used cutting-edge VLBI observations to probe the innermost jets of thre e legendary blazars\, the most extreme type of active galactic nuclei\, TX S 2013+370\, OJ 287\, and 3C 454.3. Using ground arrays like GMVA and EHT\ , along with record-breaking space VLBI observations from RadioAstron\, I explored key open questions about jet collimation\, spectral evolution\, a nd the role and morphology of magnetic fields at sub-parsec scales\, as we ll as tracing links between jet kinematics and high-energy emission.\nBeyo nd the science\, this journey has been shaped by my supervisor’s mentors hip and curiosity\, which pushed me beyond known boundaries. His dedicatio n to fostering young researchers and advancing astrophysics leaves a lasti ng legacy\, carried forward by his students and collaborators.\n\nhttps:// events.mpifr-bonn.mpg.de/indico/event/425/session/0/contribution/13 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/13 END:VEVENT BEGIN:VEVENT SUMMARY:The Effelsberg 100-m Radio Telescope: Current Status and Outlook DTSTART;VALUE=DATE-TIME:20250324T152000Z DTEND;VALUE=DATE-TIME:20250324T154000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-12@cern.ch DESCRIPTION:Speakers: KRAUS\, Alex (MPIfR)\nAlthough more than 50 years ol d\, the 100m-telescope at Effelsberg is still in perfect condition\,\nas i t has been continuously maintained and modernized during the past decades. Hence\, it is heavily involved in various kinds of astronomical research\ , using the telescope as a stand-alone instrument („single-dish“) as w ell as in several VLBI networks.\n\nHere\, we report on the developments i n the past two decades and the current status of the telescope\, and will present some highlight results gained in the recent past. We will also giv e an outlook on the activities planned for the future\, especially the ong oing upgrades.\n\nhttps://events.mpifr-bonn.mpg.de/indico/event/425/sessio n/1/contribution/12 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/12 END:VEVENT BEGIN:VEVENT SUMMARY:Concluding Remarks DTSTART;VALUE=DATE-TIME:20250324T170000Z DTEND;VALUE=DATE-TIME:20250324T171000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-15@cern.ch DESCRIPTION:Speakers: \nhttps://events.mpifr-bonn.mpg.de/indico/event/425/ session/1/contribution/15 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/15 END:VEVENT BEGIN:VEVENT SUMMARY:Welcome Address DTSTART;VALUE=DATE-TIME:20250324T114500Z DTEND;VALUE=DATE-TIME:20250324T120000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-14@cern.ch DESCRIPTION:Speakers: ZENSUS\, Anton ()\nWelcome Address\n\nhttps://events .mpifr-bonn.mpg.de/indico/event/425/session/0/contribution/14 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/14 END:VEVENT BEGIN:VEVENT SUMMARY:Cosmology using weekly global VLBI DTSTART;VALUE=DATE-TIME:20250324T133500Z DTEND;VALUE=DATE-TIME:20250324T135500Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-16@cern.ch DESCRIPTION:Speakers: Mr. HODGSON\, Jeffrey (Sejong University)\nOver the past several years\, I have been attempting to measure distances to blazar s by using the speed of light to calibrate a standard ruler. Archival data is not well suited to this kind of experiment\, so by teaming up with geo detic VLBI astronomers\, I have been performing weekly global VLBI using t he KVN\, Mopra and HartRAO. I present early results and progress in the co ntext of hints of a time variable Dark Energy.\n\nhttps://events.mpifr-bon n.mpg.de/indico/event/425/session/0/contribution/16 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/16 END:VEVENT BEGIN:VEVENT SUMMARY:A scintillating journey from Intraday Variability to spacecraft in the solar wind DTSTART;VALUE=DATE-TIME:20250324T154000Z DTEND;VALUE=DATE-TIME:20250324T160000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-0@cern.ch DESCRIPTION:Speakers: Dr. CIMO\, Giuseppe (Joint Institute for VLBI ERIC)\ nIn this presentation\, I will recall my PhD studies on Intraday Variabili ty (IDV) and interstellar scintillation. My doctoral research in Bonn will be the starting point for a journey that continues today with observation s of spacecraft signal scintillation and its applications to solar physics and the solar wind. From single-dish and VLBI analyses of the rapid varia bility of Active Galactic Nuclei to observations of spacecraft in the sola r system\, I will discuss the contribution of scintillation studies to enh ance our understanding of turbulent plasma and the value of VLBI to the fi elds of space weather and space science.\n\nhttps://events.mpifr-bonn.mpg. de/indico/event/425/session/1/contribution/0 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/0 END:VEVENT BEGIN:VEVENT SUMMARY:The Galactic Center - an AGN on a starvation diet DTSTART;VALUE=DATE-TIME:20250324T120000Z DTEND;VALUE=DATE-TIME:20250324T122000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-3@cern.ch DESCRIPTION:Speakers: Prof. FALCKE\, Heino (Radboud University)\nThe first millimetre VLBI observations of the supermassive black hole of the Galact ic Centre\, Sagittarius A*\, have provided an unprecedented insight into t he extreme physics of strong gravity. In this talk\, I will discuss the ea rly pioneering efforts that paved the way for resolving the shadow of Sgr A*\, highlighting key developments in millimeter-wave very long baseline i nterferometry (VLBI) and theoretical modelling. A crucial aspect of this w ork was the use of ray-tracing simulations and plasma emission calculation s\, carried out at the turn of the century\, to predict the appearance of the black hole shadow and its surrounding emission in curved spacetime. Th ese simulations paved the way for interpreting VLBI observations and antic ipating the challenges posed by the scattering\, variability and complex a strophysical processes that shape the observed emission. These breakthroug hs culminated in the Event Horizon Telescope's first image of Sgr A*\, con firming the predictions of general relativity.\n\nhttps://events.mpifr-bon n.mpg.de/indico/event/425/session/0/contribution/3 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/3 END:VEVENT BEGIN:VEVENT SUMMARY:Circumnuclear gas in Radio AGN Revealed by Molecular Absorption DTSTART;VALUE=DATE-TIME:20250324T150500Z DTEND;VALUE=DATE-TIME:20250324T152000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-2@cern.ch DESCRIPTION:Speakers: Mr. KIM\, Dongjin (CSIRO)\nActive Galactic Nuclei (A GNs) are thought to influence galaxy formation and evolution through their energetic radio jet outflows\, yet observational evidence on jet triggeri ng and feedback mechanisms remains limited. Studying the continuum radio j et and circumnuclear gas in AGNs with high-resolution Very Long Baseline I nterferometry (VLBI) is essential to probe accretion environments and jet feedback processes. This presentation reviews VLBI studies of AGN radio je ts\, focusing on spectroscopic analysis using molecular absorption\, and h ighlights future research opportunities with mm/sub-mm VLBI arrays to bett er understand jet triggering and feedback in AGN nuclear environments.\n\n https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contribution/2 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/2 END:VEVENT BEGIN:VEVENT SUMMARY:Decoding AGN: From Event Horizons to High Energies DTSTART;VALUE=DATE-TIME:20250324T130000Z DTEND;VALUE=DATE-TIME:20250324T132000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-5@cern.ch DESCRIPTION:Speakers: Dr. RANI\, Bindu (NASA Goddard)\nMulti-wavelength ob servations are key to understanding cosmic phenomena. When combined with V LBI data\, high-energy observations have helped us explore emission sites and processes in more detail. This talk will highlight how Thomas’s cont ributions have deepened our understanding of AGN and their role in the bro ader high-energy astrophysical context.\n\nhttps://events.mpifr-bonn.mpg.d e/indico/event/425/session/0/contribution/5 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/5 END:VEVENT BEGIN:VEVENT SUMMARY:A multi-sided look into blazar variability DTSTART;VALUE=DATE-TIME:20250324T162000Z DTEND;VALUE=DATE-TIME:20250324T164000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-4@cern.ch DESCRIPTION:Speakers: Dr. MARCHILI\, Nicola (INAF-IRA)\nIn describing the variability of blazars\, "multiplicity" seems to be an essential keyword. Multiple are the processes that generate the flux density variations obser ved in blazars' light curves: to disentangle them\, it is necessary to per form multi-frequency studies over multiple ranges of timescales. In this t alk\, I will discuss different aspects of the study of blazars through the characterisation of their variability\, covering the very short timescale s of intra-day variability experiments up to the decades-long monitoring p rograms\, from radio wavelengths to gamma rays. Along this multifaceted pa th\, several lessons --- some foreseeable\, others much less obvious --- c an be learned.\n\nhttps://events.mpifr-bonn.mpg.de/indico/event/425/sessio n/1/contribution/4 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/4 END:VEVENT BEGIN:VEVENT SUMMARY:Unravelling the mysteries of AGNs: Insights from high-resolution m illimetre radio astronomy and multi-messenger observations DTSTART;VALUE=DATE-TIME:20250324T124000Z DTEND;VALUE=DATE-TIME:20250324T130000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-7@cern.ch DESCRIPTION:Speakers: Prof. KIM\, Jae-Young (UNIST Ulsan)\nA significant f raction of active galactic nuclei (AGNs) exhibit structured relativistic j ets along with rapidly variable and luminous electromagnetic emissions ran ging from radio waves to gamma rays. Although many theoretical models prop ose that mass accretion onto central supermassive black holes (SMBHs) is t he ultimate energy source powering AGNs\, the detailed physical processes governing the structure and physics of the inner regions near SMBHs - incl uding the emergence of relativistic jets and the production of very high e nergy photons and particles - remain elusive. In this talk I will present our ongoing research\, which mainly uses ultra-high resolution millimetre- wavelength and space-based radio astronomical observations in combination with multi-wavelength and multi-messenger studies. I will highlight select ed results from different AGNs\, including M87\, other radio galaxies\, ne utrino blazars\, and peculiar radio galaxies. In addition\, I will present recent advances in high-resolution radio astronomy in Korea\, covering de velopments within the extended Korean VLBI Network project as well as our contributions to international projects such as the ngEHT\, SKA\, and futu re space mm-VLBI missions. I will conclude the talk with a personal dedica tion to Dr Krichbaum.\n\nhttps://events.mpifr-bonn.mpg.de/indico/event/425 /session/0/contribution/7 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/7 END:VEVENT BEGIN:VEVENT SUMMARY:The IRAM NOEMA phased array - Past\, Present and Future DTSTART;VALUE=DATE-TIME:20250324T144500Z DTEND;VALUE=DATE-TIME:20250324T150500Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-6@cern.ch DESCRIPTION:Speakers: Dr. BREMER\, Michael (Institut de Radio Astronomie M illimétrique (IRAM))\nThe NOrthern Extended Millimeter Array started out in the 1980s as an\nambitious project to build a millimeter interferometer on the Plateau\nde Bure\, France. First observations in single-dish mode demonstrated\nthe potential of the instrument\; a first phased array mode became\navailable in late 2002 until 2017. After a short return to single dish\nmode the present large-band NOEMA phased array mode became available \nin late 2020. This talk resumes the historical VLBI highlights of the\nP lateau de Bure Interferometer\, as well as its present state and\nfuture o utlook.\n\nhttps://events.mpifr-bonn.mpg.de/indico/event/425/session/1/con tribution/6 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/6 END:VEVENT BEGIN:VEVENT SUMMARY:The continuing story of an Effelsberg-discovered IDV source DTSTART;VALUE=DATE-TIME:20250324T160000Z DTEND;VALUE=DATE-TIME:20250324T162000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-9@cern.ch DESCRIPTION:Speakers: Dr. GABANYI\, Krisztina (Institute of Physics and As tronomy\, ELTE\, Eotvos University)\nLarge fraction of flat spectrum radio quasars show at cm wavelengths fast variability\, called Intraday Variabi lity (IDV). IDV is mainly explained as the result of propagation effect ca used by interstellar scattering of radio waves in the turbulent\, ionised interstellar matter of the Milky Way. The annual modulation of the variabi lity timescale\, caused by the Earth motion around the Sun\, observed in a handful of IDV sources\, is one of the unequivocal evidence of its extern al origin. \nJ1128+5925 was discovered to be showing pronounced variabilit y in an IDV campaign with the Effelsberg telescope. Continued monitoring r evealed an annual modulation in its light curve. Our high resolution VLBA observations showed a core-jet structure which can explain the anisotropy seen in the the annual modulation pattern. Additionally\, it revealed a po larization angle and rotation measure change whose origin is under investi gation.\n\nhttps://events.mpifr-bonn.mpg.de/indico/event/425/session/1/con tribution/9 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/1/contributi on/9 END:VEVENT BEGIN:VEVENT SUMMARY:High resolution VLBI studies of nearby supermassive black holes DTSTART;VALUE=DATE-TIME:20250324T122000Z DTEND;VALUE=DATE-TIME:20250324T124000Z DTSTAMP;VALUE=DATE-TIME:20260717T234221Z UID:indico-contribution-425-8@cern.ch DESCRIPTION:Speakers: Dr. LU\, Rusen (Shanghai Astronomical Observatory)\n Very Long Baseline Interferometry (VLBI) has revolutionized our ability to image nearby supermassive black holes with unprecedented resolution. As w e celebrate the remarkable career of Dr. Thomas Krichbaum\, this talk refl ects on our close collaboration in exploring the immediate surroundings of these “cosmic monsters”. From VLBI monitoring studies of Sgr A* to th e first-ever imaging of M87’s black hole shadow and jet together\, our w ork has helped us better understand the physics of strong gravity\, accret ion\, and relativistic jets. I will highlight some key results\, the chall enges we overcame\, and the broader impact of these studies on our underst anding of black holes in the nearby universe.\n\nhttps://events.mpifr-bonn .mpg.de/indico/event/425/session/0/contribution/8 LOCATION: URL:https://events.mpifr-bonn.mpg.de/indico/event/425/session/0/contributi on/8 END:VEVENT END:VCALENDAR