Zobrazeno 1 - 10
of 990
pro vyhledávání: '"Hamilton, Chris"'
The bulk of old stars in the Galactic disk have migrated radially by up to several kpc in their lifetimes, yet the disk has remained relatively cool, i.e., the ratio of radial heating to migration has been small. Here, we demonstrate that this small
Externí odkaz:
http://arxiv.org/abs/2411.08944
Galactic disks lie at the heart of many of the most pressing astrophysical puzzles. There are sophisticated kinetic theories that describe some aspects of galaxy disk dynamics, but extracting quantitative predictions from those theories has proven ve
Externí odkaz:
http://arxiv.org/abs/2408.03366
Autor:
Hamilton, Chris, Fouvry, Jean-Baptiste
Stellar systems - star clusters, galaxies, dark matter haloes, and so on - are ubiquitous characters in the evolutionary tale of our Universe. This tutorial article is an introduction to the collective dynamical evolution of the very large numbers of
Externí odkaz:
http://arxiv.org/abs/2402.13322
Galactic centers are very dynamically active environments, often harbouring a nuclear star cluster and supermassive black hole at their cores. Binaries in these environments are subject to strong tidal fields that can efficiently torque its orbit, ex
Externí odkaz:
http://arxiv.org/abs/2312.17319
Autor:
Hamilton, Chris, Modak, Shaunak
GAIA wide stellar binaries (separations $\sim 10^3-10^{4.5}$ AU) are observed to have a superthermal eccentricity distribution function (DF), well-fit by $P(e) \propto e^\alpha$ with $\alpha \sim 1.2$. In Modak \& Hamilton (2023), we proved that this
Externí odkaz:
http://arxiv.org/abs/2311.04352
Autor:
Hamilton, Chris, Rafikov, Roman R.
The LIGO/Virgo detections of compact object mergers have posed a challenge for theories of binary evolution and coalescence. One promising avenue for producing mergers dynamically is through secular eccentricity oscillations driven by an external per
Externí odkaz:
http://arxiv.org/abs/2306.03703
Autor:
Hamilton, Chris, Heinemann, Tobias
The linear response of a stellar system's gravitational potential to a perturbing mass comprises two distinct contributions. Most famously, the system will respond by forming a polarization 'wake' around the perturber. At the same time, the perturber
Externí odkaz:
http://arxiv.org/abs/2304.07275
The ubiquitous interstellar turbulence regulates star formation and the scaling relations between the initial velocity differences and the initial separations of stars. We propose that the formation of wide binaries with initial separations $r$ in th
Externí odkaz:
http://arxiv.org/abs/2303.16224
Autor:
Modak, Shaunak, Hamilton, Chris
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 524, Issue 2, September 2023, Pages 3102-3115
A major puzzle concerning the wide stellar binaries (semimajor axes $a\gtrsim 10^3$\,AU) in the Solar neighborhood is the origin of their observed superthermal eccentricity distribution function (DF), which is well-approximated by $P(e)\propto e^\alp
Externí odkaz:
http://arxiv.org/abs/2303.15531
Autor:
Hamilton, Chris
Spiral density waves can arise in galactic disks as linear instabilities of the underlying stellar distribution function. Such an instability grows exponentially in amplitude at some fixed growth rate $\beta$ before saturating nonlinearly. However, t
Externí odkaz:
http://arxiv.org/abs/2302.06602