{ "122178-21848418": { "datetime_modified":"20240604T063117", "datetime_start":"20240520T093000", "datetime_end":"20240520T100000", "has_end_time":1, "date_start":"2024-05-20", "date_end":"2024-05-20", "time_start":"09:30:00", "time_end":"10:00:00", "time_zone":"America\/Detroit", "event_title":"AMA with a software engineer at Handshake", "occurrence_title":"", "combined_title":"AMA with a software engineer at Handshake", "event_subtitle":"", "event_type":"Careers \/ Jobs", "event_type_id":"2", "description":"Join Handshake Staff Software Engineer Matt Campbell for answers to questions on topics like:\u201cInterviewing\u201d companiesas an engineer in the job searchFinding balance in a high-growthstartup environmentMaking a great impression as a new hire in techAbout Matt: Matt earned his Bachelor of Computer Science from the University of Illinois Urbana-Champaign andhas 19 years of professional programming experience. Specializing in backend technologies, he excels in designing and architecting large projects.As an experienced team lead and mentor, Matt is passionate about fostering strong teams through shared ownership and trust. He is dedicated to supporting engineers in their professional and personal growth and prioritizes creating a psychologically safe workplace.Bonus: by attending, you\u2019ll be automatically eligible to win one of three $100 Visa gift cards.* Hope to see you there! *View full terms & conditions: https:\/\/bit.ly\/3y25HqP  ", "occurrence_notes":null, "guid":"122178-21848418@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/122178", "building_id":"", "building_name":"", "campus_maps_id":"", "room":"", "location_name":"", "has_livestream":0, "cost":"", "tags":[], "website":"", "sponsors":[ { "group_name":"University Career Center UCC", "group_id":"1140", "website":"http:\/\/careercenter.umich.edu" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21848418 } , "121830-21847371": { "datetime_modified":"20240430T155804", "datetime_start":"20240520T110000", "datetime_end":"", "has_end_time":0, "date_start":"2024-05-20", "date_end":"", "time_start":"11:00:00", "time_end":"", "time_zone":"America\/Detroit", "event_title":"Exploring the Spin Distribution of Stellar Mass Black Holes", "occurrence_title":"", "combined_title":"Exploring the Spin Distribution of Stellar Mass Black Holes: Paul Draghis", "event_subtitle":"Paul Draghis", "event_type":"Presentation", "event_type_id":"16", "description":"The launch of NuSTAR and the increasing number of binary black hole (BBH) mergers detected through gravitational wave (GW) observations have exponentially advanced our understanding of black holes. Despite the simplicity owed to being fully described by their mass and angular momentum, black holes have remained mysterious laboratories that probe the most extreme environments in the Universe. While significant progress has been made in the recent decade, the distribution of spin in black holes has not yet been understood. Exploring the spin distribution across stellar-mass black holes provides an insight into the formation of black holes, supernova events, collapsar models, gamma-ray bursts, the formation and evolution of X-ray binary systems and binary black hole systems, and the physics of accretion. The preferred spin measurement techniques are \u201ccontinuum fitting\u201d (see e.g., Gou et al. 2009) and \u201crelativistic reflection\u201d (see e.g., Miller 2007). Relativistic reflection is independent of black hole mass, accretion rate, and distance to the system, making it a more versatile technique. Up until now, spin measurements for the same black hole using the two methods did not always agree, and even measurements using the same method did not always adopt the same sets of assumptions and theoretical prescriptions. My work provides a pipeline that uses state of the art relativistic reflection models to fully explore the entire physical parameter space and to provide a uniform treatment of a large sample of black holes. Using this pipeline on NuSTAR data, I measured more than a dozen new black hole spins in X-ray binary systems, significantly expanding the measured sample size, and remeasured existing black hole spins in order to compile a distribution of measurements made using entirely consistent methods and systematic uncertainties. Additionally, I compared the distribution to that of spins measured in mergers of binary black hole systems observed through gravitational waves, in order to offer a unified view of black hole spin evolution. The results suggest that the observed spin distribution of black holes in X-ray binaries is sharply peaked at high values, incompatible with the spin distribution inferred based on GW signals from merging BBH, suggesting that the observed black hole distributions are inherently different. Understanding the distribution of black hole spins in X-ray binaries paves the way for future Gravitational Wave efforts and for future X-ray missions such as XRISM, HEX-P, AXIS, STROBE-X, or ATHENA.", "occurrence_notes":null, "guid":"121830-21847371@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/121830", "building_id":"1000167", "building_name":"West Hall", "campus_maps_id":"163", "room":"411", "location_name":"West Hall", "has_livestream":0, "cost":"", "tags":["Astronomy"], "website":"", "sponsors":[ { "group_name":"Department of Astronomy", "group_id":"1178", "website":"" } ], "image_url":"", "styled_images":{ "event_thumb":"", "event_large":"", "event_large_2x":"", "event_large_lightbox":"", "group_thumb":"", "group_thumb_square":"", "group_large":"", "group_large_lightbox":"", "event_large_crop":"", "event_list":"", "event_list_2x":"", "event_grid":"", "event_grid_2x":"", "event_feature_large":"", "event_feature_thumb":"" }, "occurrence_count":1, "first_occurrence":21847371 } }