Zobrazeno 1 - 10
of 1 635
pro vyhledávání: '"O'Neill, P. J."'
Clustered stellar feedback creates expanding voids in the magnetized interstellar medium known as superbubbles. Although theory suggests that superbubble expansion is influenced by interstellar magnetic fields, direct observational data on 3D superbu
Externí odkaz:
http://arxiv.org/abs/2410.17341
Autor:
Kimpson, Tom, Melatos, Andrew, O'Leary, Joseph, Carlin, Julian B., Evans, Robin J., Moran, William, Cheunchitra, Tong, Dong, Wenhao, Dunn, Liam, Greentree, Julian, O'Neill, Nicholas J., Suvorova, Sofia, Thong, Kok Hong, Vargas, Andrés F.
Pulsar timing arrays can detect continuous nanohertz gravitational waves emitted by individual supermassive black hole binaries. The data analysis procedure can be formulated within a time-domain, state-space framework, in which the radio timing obse
Externí odkaz:
http://arxiv.org/abs/2410.10087
Autor:
Kimpson, Tom, Melatos, Andrew, O'Leary, Joseph, Carlin, Julian B., Evans, Robin J., Moran, William, Cheunchitra, Tong, Dong, Wenhao, Dunn, Liam, Greentree, Julian, O'Neill, Nicholas J., Suvorova, Sofia, Thong, Kok Hong, Vargas, Andrés F.
Continuous nanohertz gravitational waves from individual supermassive black hole binaries may be detectable with pulsar timing arrays. A novel search strategy is developed, wherein intrinsic achromatic spin wandering is tracked simultaneously with th
Externí odkaz:
http://arxiv.org/abs/2409.14613
Autor:
O'Neill, Michael J.
We develop a Sequential Quadratic Optimization (SQP) algorithm for minimizing a stochastic objective function subject to deterministic equality constraints. The method utilizes two different stepsizes, one which exclusively scales the component of th
Externí odkaz:
http://arxiv.org/abs/2408.16656
Autor:
O'Leary, Joseph, Melatos, Andrew, Kimpson, Tom, O'Neill, Nicholas J., Meyers, Patrick M., Christodoulou, Dimitris M., Bhattacharya, Sayantan, Laycock, Silas G. T.
Many accretion-powered pulsars rotate in magnetocentrifugal disequilibrium, spinning up or down secularly over multi-year intervals. The magnetic dipole moment $\mu$ of such systems cannot be inferred uniquely from the time-averaged aperiodic X-ray f
Externí odkaz:
http://arxiv.org/abs/2406.01827
Autor:
Fraser, Adam R., Crilly, A. J., Niasse, N. P. L., Chapman, D. A., Pecover, J. D., O'Neill, S. J., Chittenden, J. P.
Global microphysics models are required for the modelling of high-energy-density physics (HEDP) experiments, the improvement of which are critical to the path to inertial fusion energy. This work presents further developments to the atomic and microp
Externí odkaz:
http://arxiv.org/abs/2405.13814
Analysing radio pulsar timing noise with a Kalman filter: a demonstration involving PSR J1359$-$6038
In the standard two-component crust-superfluid model of a neutron star, timing noise can arise when the two components are perturbed by stochastic torques. Here it is demonstrated how to analyse fluctuations in radio pulse times of arrival with a Kal
Externí odkaz:
http://arxiv.org/abs/2403.16467
Leveraging a high-resolution 3D dust map of the solar neighborhood from Edenhofer et al. (2024), we derive a new 3D model for the dust-traced surface of the Local Bubble, the supernova-driven cavity surrounding the Sun. We find that the surface of th
Externí odkaz:
http://arxiv.org/abs/2403.04961
Autor:
O'Leary, J., Melatos, A., O'Neill, N. J., Meyers, P. M., Christodoulou, D. M., Bhattacharya, S., Laycock, S. G. T.
The magnetic dipole moment $\mu$ of an accretion-powered pulsar in magnetocentrifugal equilibrium cannot be inferred uniquely from time-averaged pulse period and aperiodic X-ray flux data, because the radiative efficiency $\eta_0$ of the accretion is
Externí odkaz:
http://arxiv.org/abs/2402.11991
Autor:
Rasmussen, Kaitlin, Chen, Jocelyne, Colquhoun, Rebecca L., Frentz, Sophia, Hiatt, Laurel, Kosciesza, Aiden James, Olsen, Charlotte, O'Neill, Theo J., Zamloot, Vic, Strauss, Beckett E.
Gender inequity is one of the biggest challenges facing the STEM workforce. While there are many studies that look into gender disparities within STEM and academia, the majority of these have been designed and executed by those unfamiliar with resear
Externí odkaz:
http://arxiv.org/abs/2307.15802