J. A. Turner

The NANOGrav 15 yr Data Set: Piecewise Power-Law Reconstruction of the Gravitational-Wave Background

Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald, Zaven Arzoumanian et autres

The NANOGrav 15-year (NG15) data set provides evidence for a gravitational-wave background (GWB) signal at nanohertz frequencies, which is expected to originate either from a cosmic population of inspiraling supermassive black-hole binaries or new particle physics in the early Universe. A firm …

The NANOGrav 15 yr Data Set: Piecewise Power-Law Reconstruction of the Gravitational-Wave Background

Gabriella Agazie, Akash Anumarlapudi, Anne M. Archibald, Zaven Arzoumanian et autres

The NANOGrav 15-year (NG15) data set provides evidence for a gravitational-wave background (GWB) signal at nanohertz frequencies, which is expected to originate either from a cosmic population of inspiraling supermassive black-hole binaries or new particle physics in the early Universe. A firm …

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A Second Chromatic Timing Event of Interstellar Origin toward PSR J1713+0747

T. Joseph W. Lazio, Michael T. Lam, Justin A. Ellis, Gianfranco Grillo et autres

Numerical simulations of the formation of binary and multiple protostellar disks, starting from dynamic initial conditions

A. P. Whitworth, A. S. Bhattal, Sydney Chapman, M. J. Disney et autres

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Molecular Gas Properties of the Starburst

Robert L. Hurt, David S. Meier, J. A. Turner

We present a map of the J=2-1 transition of (sup 13)CO in the starburst nucleus of IC 342 made with the Owens Valley Millimeter Array.

A new prescription for viscosity in Smoothed Particle Hydrodynamics

S. J. Watkins, A. S. Bhattal, N. Francis, J. A. Turner et autres

Smoothed particle hydrodynamics (SPH) is a particle method for modelling hydrodynamical flows that has been successfully applied to a wide range of astrophysical problems. One of its main weaknesses, however, has been its inability to treat viscosity in a rigorous manner. We …

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Binary star formation: accretion-induced rotational fragmentation

A. P. Whitworth, Sydney Chapman, A. S. Bhattal, M. J. Disney et autres

We describe in detail two numerical simulations which illustrate a promising mechanism for binary star formation. This mechanism relies on the likelihood that protostellar discs are fed by accretion flows in which the specific angular momentum increases with time. Consequently, protostellar discs …

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Binary star formation: gravitational fragmentation followed by capture

J. A. Turner, Sydney Chapman, A. S. Bhattal, M. J. Disney et autres

We describe in detail one of a sequence of numerical simulations which realize the mechanism of binary star formation proposed by Pringle. In these simulations, collisions between stable molecular cloud clumps produce dense shocked layers, which cool radiatively and fragment gravitationally. The …

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Fragmentation of shocked interstellar gas layers.

A. P. Whitworth, A. S. Bhattal, Sydney Chapman, M. J. Disney et autres

We analyze the fragmentation of shocked interstellar gas layers. Our formulation is designed to explore the consequences of radiative cooling behind the shock, to derive from first principles the basic phenomenology of the fragmentation of shocked interstellar gas layers, and to emphasize …

Star formation in shocked layers

Sydney Chapman, A. S. Bhattal, M. J. Disney, J. A. Turner et autres

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Binary and multiple star formation

J. A. Turner, Sydney Chapman, A. S. Bhattal, M. J. Disney et autres

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An interstellar thermostat: gas temperature regulated by grain charge

J. A. Turner, A. P. Whitworth

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