CGCA Seminars

Spin Signatures in Horizon-Resolved Images of LLAGN
Dr. Daniel Palumbo, Smithsonian Astrophysical Observatory
Harvard University

With the advent of the Event Horizon Telescope (EHT), near-horizon black hole imaging with sub-mm very-long-baseline interferometry (VLBI) is now routine for the two sources for which terrestrial VLBI is sufficient to resolve the black hole shadow: Messier 87* and Sagittarius A*. Since the first images of M87*, the theoretical analysis of these images has advanced a broad class of black hole spin tracers in horizon-resolving observations, all of which have complex interplay with the astrophysical conditions near the horizon. Meanwhile, space VLBI mission concepts such as the Black Hole Explorer aim to drastically improve the angular resolution available via sub-mm VLBI, resolving out the primary accretion disk image to isolate the strongly lensed "photon ring," which more robustly exposes black hole mass, spin, and viewing inclination to distant observers.

A Parameter Study of Eccentric Accretion Disks in GRMHD
Joaquin Duran
University of Texas at San Antonio

We present a three dimensional GRMHD parameter study of circularized and eccentric black hole accretion disks using the KORAL code. Our simulations span SANE and MAD magnetic flux states, black hole spins of a=0 and a=0.9, and disk eccentricities of e=0, 0.38, and 0.5. We investigate how orbital eccentricity changes disk morphology, radial inflow, magnetization, accretion variability, outflow efficiency, and disk outflow orientation. Eccentric disks develop stronger nonaxisymmetric structure and shock heated spiral features, while their radial inflow differs from circularized controls. The magnetic response depends strongly on flux state: eccentric SANE models are less magnetized and less variable, while eccentric MAD models are more magnetized and more variable. In MAD, eccentricity is also associated with larger disk and magnetized polar outflow orientation excursions.

Title and abstract to be determined
Nick Conroy
IAA/CfA

The abstract for this talk will be added as soon as it is made available.

Title and abstract to be determined
Patrick Brady
Professor, University of Wisconsin-Milwaukee

The abstract for this talk will be added as soon as it is made available.

Title and abstract to be determined
Alexander W. Criswell
Vanderbilt University

The abstract for this talk will be added as soon as it is made available.

Title and abstract to be determined
Pratyasha Gitika
Postdoctoral Scholar, University of Wisconsin-Milwaukee

The abstract for this talk will be added as soon as it is made available.

Title and abstract to be determined
Matthew Todd
Postdoctoral Scholar, MIT

The abstract for this talk will be added as soon as it is made available.

Title and abstract to be determined
Vedant Dhruv
Postdoctoral Scholar, Washington University St. Louis

The abstract for this talk will be added as soon as it is made available.