260 citations · 1.1k across the 35 of their papers we have counts for
36 papers
JWST Observations of the Double Nucleus in NGC 4486B: Possible Evidence for a Recent Binary SMBH Merger and Recoil
Behzad Tahmasebzadeh, Monica Valluri, Shashank Dattathri +19
A recent study of the compact elliptical galaxy NGC 4486B using JWST-NIRSpec IFU kinematics confirmed a supermassive black hole (SMBH) of mass (~8% of…
A JWST View of the Overmassive Black Hole in NGC 4486B
Behzad Tahmasebzadeh, Matthew A. Taylor, Monica Valluri +19
We present a new stellar dynamical measurement of the supermassive black hole (SMBH) in the compact elliptical galaxy NGC 4486B, based on integral field spectroscopy with JWST/NIRS…
On the Formation of S-stars from a Recent Massive Black Hole Merger in the Galactic Center
Tatsuya Akiba, Smadar Naoz, Ann-Marie Madigan
The Galactic Center hosts a rotating disk of young stars between 0.05 and 0.5 pc of Sgr A*. The ``S-stars'' at a distance pc, however, are on eccentric orbits with nearly i…
Counter-Rotation and Slow Precession in Aligned Eccentric Nuclear Disks due to Gravitational Wave Recoil Kicks
Jane C. Bright, Tatsuya Akiba, Ann-Marie Madigan
The M31 nucleus contains a supermassive black hole embedded in a massive stellar disk of apsidally-aligned eccentric orbits. It has recently been shown that this disk is slowly pre…
Tidal Disruption of Planetesimals from an Eccentric Debris Disk Following a White Dwarf Natal Kick
Tatsuya Akiba, Selah McIntyre, Ann-Marie Madigan
The surfaces of many white dwarfs are polluted by metals, implying a recent accretion event. The tidal disruption of planetesimals is a viable source of white dwarf pollution and o…
How to Flip a Bar
Angela Collier, Ann-Marie Madigan
Galactic bars, made up of elongated and aligned stellar orbits, can lose angular momentum via resonant torques with dark matter particles in the halo and slow down. Here we show th…
Anisotropic Star Clusters around Recoiling Supermassive Black Holes
Tatsuya Akiba, Ann-Marie Madigan
Gravitational wave recoil kicks from merging supermassive black hole binaries can have a profound effect on the surrounding stellar population. In this work, we study the dynamic a…
Steeper Scattered Disks Buckle Faster
Alexander Zderic, Ann-Marie Madigan
Disks of low-mass bodies scattered by giant planets to large semi-major axis and constant periapsis orbits are vulnerable to a buckling instability. This instability exponentially…
Forming Young and Hypervelocity Stars in the Galactic Centre via Tidal Disruption of a Molecular Cloud
A. Generozov, S. Nayakshin, A. M. Madigan
The Milky Way Galaxy hosts a four million solar mass black hole, Sgr A*, that underwent a major accretion episode approximately 3-6 Myr ago. During the episode, hundreds of young m…
On the Formation of an Eccentric Nuclear Disk following the Gravitational Recoil Kick of a Supermassive Black Hole
Tatsuya Akiba, Ann-Marie Madigan
The anisotropic emission of gravitational waves during the merger of two supermassive black holes can result in a recoil kick of the merged remnant. We show here that eccentric nuc…
Bar-driven Leading Spiral Arms in a Counter-rotating Dark Matter Halo
Emma Lieb, Angela Collier, Ann-Marie Madigan
An overwhelming majority of galactic spiral arms trail with respect to the rotation of the galaxy, though a small sample of leading spiral arms has been observed. The formation of…
Photometry and Kinematics of Self-Gravitating Eccentric Nuclear Disks
Heather N. Wernke, Ann-Marie Madigan
The Andromeda Galaxy hosts an elongated nucleus with (at least) two distinct brightness peaks. The double nucleus can be explained by the projection of a thick, apsidally-aligned e…
A Lopsided Outer Solar System
Alexander Zderic, Maria Tiongco, Angela Collier +3
Axisymmetric disks of eccentric orbits in near-Keplerian potentials are unstable to an out-of-plane buckling. Recently, Zderic et al. (2020) showed that an idealized disk saturates…
The Coupling of Galactic Dark Matter Halos with Stellar Bars
Angela Collier, Ann-Marie Madigan
Resonant torques couple stellar bars to dark matter halos. Here we use high-resolution numerical simulations to demonstrate long-term angular momentum transfer between stellar bars…
Galactic merger implications for eccentric nuclear disks: a mechanism for disk alignment
Alexander Rodriguez, Aleksey Generozov, Ann-Marie Madigan
The nucleus of our nearest, large galactic neighbor, M31, contains an eccentric nuclear disk--a disk of stars on eccentric, apsidally-aligned orbits around a supermassive black hol…
Giant Planet Influence on the Collective Gravity of a Primordial Scattered Disk
Alexander Zderic, Ann-Marie Madigan
Axisymmetric disks of high eccentricity, low mass bodies on near-Keplerian orbits are unstable to an out-of-plane buckling. This "inclination instability" exponentially grows the o…
Apsidal Clustering following the Inclination Instability
Alexander Zderic, Angela Collier, Maria Tiongco +1
Disks of low-mass bodies on high-eccentricity orbits in near-Keplerian potentials can be dynamically unstable to buckling out of the plane. In this letter, we present -body simu…
The Hills Mechanism and the Galactic Center S-stars
Aleksey Generozov, Ann-Marie Madigan
Our Galactic center contains young stars, including the few million year old clockwise disk between 0.05 and 0.5 pc from the Galactic center, and the S-star cluster of B-type stars…
Secular Eccentricity Oscillations in Axisymmetric Disks of Eccentric Orbits
Jacob Fleisig, Alexander Zderic, Ann-Marie Madigan
Massive bodies undergo orbital eccentricity oscillations when embedded in an axisymmetric disk of smaller mass orbits. These eccentricity oscillations are driven by secular torques…
Mass Segregation in Eccentric Nuclear Disks: Enhanced Tidal Disruption Event Rates for High Mass Stars
Hayden R. Foote, Aleksey Generozov, Ann-Marie Madigan
Eccentric nuclear disks (ENDs) are a type of star cluster in which the stars lie on eccentric, apsidally-aligned orbits in a disk around a central supermassive black hole (SMBH). T…
The Effect of General Relativistic Precession on Tidal Disruption Events from Eccentric Nuclear Disks
Heather N. Wernke, Ann-Marie Madigan
An eccentric nuclear disk consists of stars moving on apsidally-aligned orbits around a central black hole. The secular gravitational torques that dynamically stabilize these disks…
On the Dynamics of the Inclination Instability
Ann-Marie Madigan, Alexander Zderic, Michael McCourt +1
Axisymmetric disks of eccentric Kepler orbits are vulnerable to an instability which causes orbits to exponentially grow in inclination, decrease in eccentricity, and cluster in th…
Dynamical Properties of Eccentric Nuclear Disks: Stability, Longevity, and Implications for Tidal Disruption Rates in Post-Merger Galaxies
Ann-Marie Madigan, Andrew Halle, Mackenzie Moody +3
In some galaxies, the stars orbiting the supermassive black hole take the form of an eccentric nuclear disk, in which every star is on a coherent, apsidally-aligned orbit. The most…
A Characteristic Scale for Cold Gas
Michael McCourt, S. Peng Oh, Ryan M. O'Leary +1
We find that clouds of optically-thin, pressure-confined gas are prone to fragmentation as they cool below K. This fragmentation follows the lengthscale $\sim{c}_{\text{…