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Elongated jets from young stellar objects typically present a nodular structure, formed by a chain of bright knots of enhanced emission with individual proper motions. Though it is generally accepted that internal shocks play an important…

Astrophysics · Physics 2009-11-13 F. Rubini , S. Lorusso , L. Del Zanna , F. Bacciotti

Inspired by Barnard 68, a Bok globule, that undergoes stable oscillations, we perform multi-phase hydrodynamic simulations to analyze the stability of Bok globules. We show that a high-density soft molecular core, with an adiabatic index…

Solar and Stellar Astrophysics · Physics 2017-09-27 Ui-Han Zhang , Hsi-Yu Schive , Tzihong Chiueh

The study of the chemical evolution of gas and dust from pre-stellar dense cores to circumstellar disks around young stars forms an essential part of understanding star- and planet formation. Throughout the collapse- and protostellar…

Astrophysics · Physics 2007-05-23 Ewine F. van Dishoeck , Michiel R. Hogerheijde

Non-axisymmetric features are found in the core collapse of a rapidly rotating massive star, which might have important implications for magnetic field amplification and production of a bipolar outflow that can explode the star, as well as…

High Energy Astrophysical Phenomena · Physics 2018-03-16 Avishai Gilkis

Star streams in galactic halos are long, thin, unbound structures that will be disturbed by the thousands dark matter sub-halos that are predicted to be orbiting within the main halo. A sub-halo generally induces a localized wave in the…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 R. G. Carlberg

During the formation of a star, material is ejected along powerful jets that impact the ambient material. This outflow regulates star formation by e.g. inducing turbulence and heating the surrounding gas. Understanding the associated shocks…

We revisit the interpretation of blue-excess molecular lines from dense collapsing cores, considering recent numerical results that suggest prestellar core collapse occurs from the outside-in, and not inside-out. We thus create synthetic…

Astrophysics of Galaxies · Physics 2022-01-28 Robert M. Loughnane , Enrique Vázquez-Semadeni , Raúl Naranjo-Romero

Observations that resolve nearby galaxies into individual regions across multiple phases of the gas-star formation-feedback ``matter cycle'' have provided a sharp new view of molecular clouds, star formation efficiencies, timescales for…

Astrophysics of Galaxies · Physics 2024-04-01 Eva Schinnerer , Adam K. Leroy

We analyze the finite-time blow-up of solutions of the heat flow for $k$-corotational maps $\mathbb R^d\to S^d$. For each dimension $d>2+k(2+2\sqrt{2})$ we construct a countable family of blow-up solutions via a method of matched…

Analysis of PDEs · Mathematics 2015-06-19 Paweł Biernat

We analyze the dynamics of the shell produced when a bow shock from a collimated jet propagates into the surrounding medium. Under interstellar conditions, the shock is radiative, and a ballistic approximation for the shell flow is…

Astrophysics · Physics 2009-11-06 Eve C. Ostriker , Chin-Fei Lee , James M. Stone , Lee G. Mundy

In this letter, we discuss how flow inhomogeneity affects the self-diffusion behavior in granular flows. Whereas self-diffusion scalings have been well characterized in the past for homogeneous shearing, the effect of shear localization and…

Soft Condensed Matter · Physics 2022-09-26 Riccardo Artoni , Michele Larcher , James Jenkins , Patrick Richard

We investigate the Hierarchical Gravitational Fragmentation scenario through numerical simulations of the prestellar stages of the collapse of a marginally gravitationally unstable isothermal sphere immersed in a strongly gravitationally…

Astrophysics of Galaxies · Physics 2015-10-26 Raúl Naranjo-Romero , Enrique Vázquez-Semadeni , Robert M. Loughnane

We investigate spherically-symmetric, general relativistic systems of collapsing perfect fluid distributions. We consider neutron star models that are driven to collapse by the addition of an initially "in-going" velocity profile to the…

General Relativity and Quantum Cosmology · Physics 2008-11-26 Scott C. Noble , Matthew W. Choptuik

The character of star formation is intimately related to the supersonic magnetohydrodynamic (MHD) turbulent dynamics of the molecular clouds in which stars form. A significant amount of the turbulent energy dissipates in low velocity…

Astrophysics of Galaxies · Physics 2015-10-09 Andrew Lehmann , Mark Wardle

In the presence of self-gravity, we investigate the self-similar dynamics of a relativistically hot gas with or without shocks in astrophysical processes of stellar core collapse, formation of compact objects, and supernova remnants with…

Astrophysics · Physics 2009-11-13 Yu-Qing Lou , Yi Cao

We simulate numerically the surface flow of a gas-supplying companion star in a semi-detached binary system. Calculations are carried out for a region including only the mass-losing star, thus not the mass accreting star. The equation of…

Astrophysics · Physics 2009-11-07 Kazutaka Oka , Takizo Nagae , Takuya Matsuda , Hidekazu Fujiwara , Henri M. J. Boffin

The formation of massive stars is a highly complex process in which it is not clear whether the star-forming gas is in global gravitational collapse or in an equilibrium state, supported by turbulence. By studying one of the most massive…

Astrophysics of Galaxies · Physics 2015-05-18 N. Schneider , T. Csengeri , S. Bontemps , F. Motte , R. Simon , P. Hennebelle , C. Federrath , R. Klessen

The spatial morphology, spectral characteristics, and time variability of ultracompact H II regions provide strong constraints on the process of massive star formation. We have performed simulations of the gravitational collapse of rotating…

Astrophysics of Galaxies · Physics 2010-07-27 Thomas Peters , Mordecai-Mark Mac Low , Robi Banerjee , Ralf S. Klessen , Cornelis P. Dullemond

In this paper we prove the existence of a family of self-similar solutions for a class of coagulation equations with a constant flux of particles from the origin. These solutions are expected to describe the longtime asymptotics of…

Analysis of PDEs · Mathematics 2022-06-01 Marina A. Ferreira , Eugenia Franco , Juan J. L. Velázquez

Supersonic isothermal turbulence establishes a network of transient dense shocks that sweep up material and have a density profile described by balance between ram pressure of the background fluid versus the magnetic and gas pressure…

Astrophysics of Galaxies · Physics 2018-08-08 Philip Mocz , Blakesley Burkhart