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CRA Cosmic Coffee: KwangHo Park

Howey N201/202 837 State Street, Atlanta, GA, United States

Title: Intermittent AGN feedback in galaxy clusters driven by cold gas accretion Abstract: Recent observations of cool core clusters provide evidence that the presence of cold, atomic and molecular gas in their centers is more common than previously expected. This finding has important implications for the fueling of and feedback from the supermassive black holes … Continue reading "CRA Cosmic Coffee: KwangHo Park"

CRA Cosmic Coffee: Jordi Manyer

Howey N201/202 837 State Street, Atlanta, GA, United States

Title: Design of an Expanding Cosmological Background for the Moving Punctures approach to Numerical Relativity Abstract: Predicted in 1916 by Albert Einstein in his theory of general relativity, gravitational waves are now at the heart of modern astrophysics. Created in some of the most energetic events in the universe, such as binary black hole collisions, … Continue reading "CRA Cosmic Coffee: Jordi Manyer"

CRA Seminar: Dr. Stefano Marchesi (Clemson University)

Title: A multi-observatory X-ray approach to characterize heavily obscured AGNs According to the different models of Cosmic X-ray Background (CXB), the diffuse X-ray emission observed in the 1 to ~200-300 keV band, is mainly caused by accreting supermassive black holes, the so-called active Galactic Nuclei (AGN). Particularly, at the peak of the CXB (~30 keV) … Continue reading "CRA Seminar: Dr. Stefano Marchesi (Clemson University)"

CRA Seminar: Mahdi Bagheri (University of New Hampshire)

Monte Carlo Simulation and Balloon-Borne Observation of Energetic Radiations and Electromagnetic Fields from Thunderstorms and Lightning   Mahdi Bagheri Space Science Center and Physics Department, University of New Hampshire   Abstract: Lightning is one of the most energetic geophysical phenomena, producing the brightest light and loudest sound commonly occurring on Earth. Because of its high … Continue reading "CRA Seminar: Mahdi Bagheri (University of New Hampshire)"

CRA Cosmic Coffee: Mathilda Avirett-Mackenzie

Howey N201/202 837 State Street, Atlanta, GA, United States

Title: The Evolving X-ray Spectrum of Active Galactic Nuclei Abstract: The cosmic X-ray background (XRB) spectrum and active galaxy number counts encode essential information about the spectral evolution of active galactic nuclei (AGNs) and have been successfully modeled by XRB synthesis models for many years. Recent measurements of the 8–24 keV AGN number counts by … Continue reading "CRA Cosmic Coffee: Mathilda Avirett-Mackenzie"

CRA seminar: Prof. Shane Davis (University of Virginia)

Title: How Black Holes Dine above the Eddington "Limit" without Overeating or Excessive Belching Abstract The study of super-Eddington accretion is essential to our understanding of the growth of super-massive black holes in the early universe, the accretion of tidally disrupted stars, and the nature of ultraluminous X-ray sources. Unfortunately, this mode of accretion is … Continue reading "CRA seminar: Prof. Shane Davis (University of Virginia)"

CRA Seminar: Prof. Huan Yang (Perimeter Institute)

Probing neutron star physics with gravitational wave detections The recent detection of the binary neutron star merger event (GW170817) has marked the beginning of multi-messenger astronomy with gravitational waves. In this talk I will briefly review current findings associated with GW170817 and introduce new opportunities from future detections. In the first part, I will explain … Continue reading "CRA Seminar: Prof. Huan Yang (Perimeter Institute)"

CRA Seminar: Dr. Juan Calderon Bustillo (Monash University)

Howey N201/202 837 State Street, Atlanta, GA, United States

https://research.monash.edu/en/persons/juan-calderon-bustillo Title: Exploring the strong field phenomena of black holes Abstract: At the event horizon of a black hole, gravity reaches its most extreme behaviour. Studying the dynamics of event horizons is key to understand gravity in is ultra-strong field regime and investigate the most fundamental properties of black holes. Black hole collisions provide a … Continue reading "CRA Seminar: Dr. Juan Calderon Bustillo (Monash University)"

CRA Seminar: Lee Samuel Finn (Penn State University)

Observational tests of general relativity with black hole inspiral, coalescence, and ringdown Prof. Lee Samuel Finn (Penn State University) Website: https://www.phys.psu.edu/people/lsf5 Abstract: As far as it has been tested, general relativity “works”; however, tests of general relativity are spotty in their coverage and - especially in the dynamical regime - leave much to be desired … Continue reading "CRA Seminar: Lee Samuel Finn (Penn State University)"

CRA seminar: Prof. Konstantin Batygin (Caltech)

Bogg 1-44 VizLab

Title: “I Like to Myself Believe That Planet 5 Turns Slowly” Abstract: Within the general framework of the core-nucleated accretion theory of giant planet formation, the conglomeration of massive gaseous envelopes is facilitated by a transient period of rapid accumulation of nebular material. While the concurrent build-up of angular momentum is expected to leave newly … Continue reading "CRA seminar: Prof. Konstantin Batygin (Caltech)"