{"677607":{"#nid":"677607","#data":{"type":"event","title":"School of Physics CRA Seminar Prof. Fabio Pacucci","body":[{"value":"\u003Cp\u003E\u003Cstrong\u003ESpeaker:\u0026nbsp;\u003C\/strong\u003EProf. Fabio Pacucci\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EHost: \u003C\/strong\u003EProf. John Wise\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ETitle: \u003C\/strong\u003EJWST\u0027s Little Red Dots: Masters of Disguise in the High-Redshift Universe\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThis talk will explore the exciting journey to probe several populations of black holes, spanning from the distant to the local Universe. I will focus primarily on the \u0022little red dots\u0022 (LRDs), a newly discovered and puzzling population of compact red sources at redshift z \u0026gt; 4, identified by JWST. These objects challenge our current astrophysical models in several ways. First, I will discuss the detection of overmassive black holes relative to the stellar mass of their host galaxies. Second, I will address the X-ray weakness problem, where these sources remain undetected in deep X-ray surveys. I will use advanced GRRMHD simulations to\u0026nbsp;show how mildly super-Eddington accretion onto slowly spinning black holes can resolve this issue. Third, I will explore the extremely high stellar densities at the cores of these objects and their potential for triggering runaway stellar collisions. Throughout the talk, I will also discuss how the\u0026nbsp;LRDs represent\u0026nbsp;a perfect bridge to study other populations of black holes, with a focus on the role of future observatories such as HWO and AXIS. These include the search for black hole seeds at redshifts z = 20-30 and the detection of quiescent black holes in the local Universe.\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003E\u003Cstrong\u003EAbstract:\u003C\/strong\u003E\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThis talk will explore the exciting journey to probe several populations of black holes, spanning from the distant to the local Universe. I will focus primarily on the \u0022little red dots\u0022 (LRDs), a newly discovered and puzzling population of compact red sources at redshift z \u0026gt; 4, identified by JWST. These objects challenge our current astrophysical models in several ways. First, I will discuss the detection of overmassive black holes relative to the stellar mass of their host galaxies. Second, I will address the X-ray weakness problem, where these sources remain undetected in deep X-ray surveys. I will use advanced GRRMHD simulations to\u0026nbsp;show how mildly super-Eddington accretion onto slowly spinning black holes can resolve this issue. Third, I will explore the extremely high stellar densities at the cores of these objects and their potential for triggering runaway stellar collisions. Throughout the talk, I will also discuss how the\u0026nbsp;LRDs represent\u0026nbsp;a perfect bridge to study other populations of black holes, with a focus on the role of future observatories such as HWO and AXIS. These include the search for black hole seeds at redshifts z = 20-30 and the detection of quiescent black holes in the local Universe.\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"CRA Seminar | Prof. Fabio Pacucci|CFA Harvard | Host: Prof. Joh, Wise"}],"uid":"30957","created_gmt":"2024-10-16 12:54:56","changed_gmt":"2024-10-16 13:10:42","author":"Shaun Ashley","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2024-10-24T15:30:00-04:00","event_time_end":"2024-10-24T16:30:00-04:00","event_time_end_last":"2024-10-24T16:30:00-04:00","gmt_time_start":"2024-10-24 19:30:00","gmt_time_end":"2024-10-24 20:30:00","gmt_time_end_last":"2024-10-24 20:30:00","rrule":null,"timezone":"America\/New_York"},"location":"Gilbert Boggs Building Rm B1-44","extras":[],"hg_media":{"675332":{"id":"675332","type":"image","title":"Fabio Pacucci","body":null,"created":"1729084077","gmt_created":"2024-10-16 13:07:57","changed":"1729084122","gmt_changed":"2024-10-16 13:08:42","alt":"Fabio Pacucci","file":{"fid":"258943","name":"Fabio Pacucci.jpg","image_path":"\/sites\/default\/files\/2024\/10\/16\/Fabio%20Pacucci.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2024\/10\/16\/Fabio%20Pacucci.jpg","mime":"image\/jpeg","size":13210,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2024\/10\/16\/Fabio%20Pacucci.jpg?itok=ptRyhknt"}}},"media_ids":["675332"],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[{"id":"166937","name":"School of Physics"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"177814","name":"Postdoc"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}