Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session H03: Electromagnetic Signals from LISA EventsInvited Live
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Sponsoring Units: DAP DGRAV Chair: Jonathan Gair, MPI-GP |
Sunday, April 18, 2021 10:45AM - 11:21AM Live |
H03.00001: GRMHD Simulations of LISA Counterparts Invited Speaker: Jeremy Schnittman It is now widely appreciated that the scientific value of gravitational wave (GW) observations, and LISA in particular, will be significantly enhanced with the accompanying electromagnetic (EM) observations of the GW sources. However, to date, there are no confirmed EM signatures of binary black holes, so we are entirely dependent on theoretical models for how they may be identified in a deep field of faint galaxies with z\textgreater 1. We report here on the current state-of-the-art in general relativistic magneto-hydrodynamic (GRMHD) simulations of circumbinay accretion disks around supermassive black holes (SMBHs). In particular, we focus on the astrophysical questions that might be answered by these simulations with, and without GW counterparts. [Preview Abstract] |
Sunday, April 18, 2021 11:21AM - 11:57AM Live |
H03.00002: The Electromagnetic Search for Close-Separation Supermassive Black Hole Binaries: Periodicity, Doppler Shifts and Lensing Invited Speaker: Daniel D'Orazio Despite their importance for understanding the mutual build-up of supermassive black holes and their host galaxies, and the emission of low frequency gravitational waves, there is yet no definitive evidence for sub-parsec separation supermassive black hole binaries in galactic nuclei. This is partly because presently employed methods, which aim to identify such binaries via electromagnetic radiation, rely on indirect evidence that takes many years to accumulate. I will discuss these and novel methods that may provide the first definitive evidence for supermassive black hole binaries at sub-parsec separations. I will additionally discuss some intriguing candidates. [Preview Abstract] |
Sunday, April 18, 2021 11:57AM - 12:33PM Live |
H03.00003: Stellar Dynamical Pathways to Coincident Gravitational Wave and Electromagnetic Transients from Intermediate Mass Black Holes in Dense Stellar Systems Invited Speaker: Morgan MacLeod When they are embedded in dense star clusters, intermediate-mass black holes acquire close stellar and compact object companions. Over time, these pairings are subject to dynamical exchanges, continuous fly-by gravitational interactions, and secular dynamical torques. These processes tend to scatter systems into the phase space where they undergo strong gravitational wave emission or tidal stripping of a stellar object. Because of the diversity of stellar types and dynamical processes at play, we expect a range of different signatures in the gravitational wave and electromagnetic domains. This talk will review how the dynamical processes that assemble these sources offer us crucial clues about the nature of their possible coincident electromagnetic and gravitational wave signatures. [Preview Abstract] |
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