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Star formation is a multi-scale, multi-physics problem ranging from the size scale of molecular clouds ($\sim$10s pc) down to the size scales of dense prestellar cores ($\sim$0.1 pc) that are the birth sites of stars. Several physical…

Solar and Stellar Astrophysics · Physics 2020-05-27 Anna L. Rosen , Stella S. R. Offner , Sarah I. Sadavoy , Asmita Bhandare , Enrique Vázquez-Semadeni , Adam Ginsburg

Numerical simulations of outflows formed during the collapse of 100 M_sun cloud cores are presented. We derive a generalised criterion from MHD wind theory to analyse the launching mechanism of these outflows. The criterion is successfully…

Solar and Stellar Astrophysics · Physics 2015-05-30 D. Seifried , R. E. Pudritz , R. Banerjee , D. Duffin , R. S. Klessen

Understanding the formation pathway for close-companion protostars is central to unraveling the processes that govern stellar multiplicity and very early star formation. We analyze a large sample of 51 Class 0/I close-companion protostellar…

Active galaxies and quasers are believed to harbour Black Holes at their centers and at the same time produce cosmic radio jets through which immense amount of matter and energy are ejected out of the core of the galaxy. In our work we…

Astrophysics · Physics 2007-05-23 Tapas K. Das

We investigate the correlation between ionized gas outflows, jets, and star formation in a sample of 42 local type-I active galactic nuclei (AGNs) exhibiting significant [O III] outflows. This study uses both new submillimeter (sub-mm)…

Astrophysics of Galaxies · Physics 2026-01-16 Chen Qin , Huynh Anh N. Le , Yongquan Xue , Shifu Zhu , Xiaozhi Lin , Kim Ngan Nhat Nguyen

Young stars accrete mass from a circumstellar disk, but at the same time disk and star eject outflows and jets. These outflows have an onion-like structure where the innermost and fastest layers are surrounded by increasingly lower velocity…

We present the first systematic study of bipolar outflows using HC$_3$N as a tracer in a sample of 146 massive star-forming regions from ALMA-ATOMS survey. Protostellar outflows arise at the initial stage of star formation as a consequence…

In this paper we explore the relationship between protostellar outflows and turbulence in molecular clouds. Using 3-D numerical simulations we focus on the hydrodynamics of multiple outflows interacting within a parsec scale volume. We…

Systematic abundance differences that depend on the condensation temperatures of elements have been observed, in particular for stars similar to the Sun; solar twins and solar analogs. Similar differences have also recently been shown to…

Earth and Planetary Astrophysics · Physics 2025-06-13 Åke Nordlund

We revisit the launch of the galactic outflow in M82 using hydrodynamic simulations. Employing a sink-particle module, we self-consistently resolve star formation and feedback, avoiding reliance on simplified models. We investigate the…

Astrophysics of Galaxies · Physics 2026-01-21 Tian-Rui Wang , Weishan Zhu , Xue-Fu Li , Wen-Sheng Hong , Long-Long Feng

Bubbles bursting at the surface of the ocean produce drops that heavily influence ocean-atmosphere interactions. One of the mechanisms through which drops are formed is called jet drop production, where the collapse of the bubble cavity…

Fluid Dynamics · Physics 2025-11-04 Tristan Aurégan , Noé Daniel , Megan Mazzatenta , Luc Deike

Relativistic outflows, or `Jets', represent one of the most obvious, important and yet poorly-explained phenomena associated with accreting relativistic objects, including X-ray binaries. In the past decade we have observed highly…

Astrophysics · Physics 2009-09-29 Rob Fender

The relation between the mass accretion rate onto the circumstellar disc and the rate of mass ejection by magnetically driven winds is investigated using three-dimensional magnetohydrodynamics simulations. Using a spherical cloud core with…

Solar and Stellar Astrophysics · Physics 2017-07-05 Yuko Matsushita , Masahiro N. Machida , Yuya Sakurai , Takashi Hosokawa

Jets and outflows are commonly observed in young stellar objects (YSOs), yet their origins remain debated. Using 3D non-ideal magnetohydrodynamic (MHD) simulations of a circumstellar disk threaded by a large-scale open poloidal magnetic…

Solar and Stellar Astrophysics · Physics 2025-07-03 Yisheng Tu , Zhi-Yun Li , Zhaohuan Zhu , Chun-Yen Hsu , Xiao Hu

Theoretical models suggest that massive stars form via disk-mediated accretion, with bipolar outflows playing a fundamental role. A recent study toward massive molecular outflows has revealed a decrease of the SiO line intensity as the…

Astrophysics of Galaxies · Physics 2015-06-15 A. Sanchez-Monge , A. Lopez-Sepulcre , R. Cesaroni , C. M. Walmsley , C. Codella , M. T. Beltran , M. Pestalozzi , S. Molinari

Powerful relativistic jets in radio galaxies are capable of driving strong outflows but also inducing star-formation by pressure-triggering collapse of dense clouds. We review theoretical work on negative and positive active galactic nuclei…

Astrophysics of Galaxies · Physics 2016-03-16 A. Y. Wagner , G. V. Bicknell , M. Umemura , R. S. Sutherland , J. Silk

We have observed 99 mid-infrared-bright, massive young stellar objects and compact HII regions drawn from the Red MSX source (RMS) survey in the J=3$-$2 transition of $^{12}$CO and $^{13}$CO, using the James Clerk Maxwell Telescope. 89…

Solar and Stellar Astrophysics · Physics 2015-09-02 L. T. Maud , T. J. T. Moore , S. L. Lumsden , J. C. Mottram , J. S. Urquhart , M. G. Hoare

We present Atacama Large Millimeter/submillimeter Array observations of the $\sim$10 kAU environment surrounding 21 protostars in the Orion A molecular cloud tracing outflows. Our sample is composed of Class 0 to flat-spectrum protostars,…

Understanding the collapse of clouds and the formation of protoplanetary disks is essential to understanding the formation of stars and planets. Infall and accretion, the mass-aggregation processes that occur at envelope and disk scales,…

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