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Recent observations have revealed a surprisingly large fraction of hydrogen-rich supernovae (SNe) interacting with dense confined circumstellar material (CSM), whose origin is heavily debated. Exploiting our recent implementation of a…

Solar and Stellar Astrophysics · Physics 2025-10-17 Jing-Ze Ma , Stephen Justham , Ruediger Pakmor , Andrea Chiavassa , Taeho Ryu , Selma de Mink

(Abridged) We explore new observationally-constrained sub-resolution models of galactic outflows and investigate their impact on the circumgalactic medium (CGM) over redshifts z = 2 - 4. We perform cosmological hydrodynamic simulations,…

The circumgalactic medium (CGM) of nearby star-forming galaxies shows clear indications of OVI absorption accompanied by little to no detectable NV absorption. This unusual spectral signature, accompanied by highly non-uniform absorption…

Astrophysics of Galaxies · Physics 2020-07-01 Edward Buie , William J. Gray , Evan Scannapieco , Mohammadtaher Safarzadeh

We present a comparison of molecular clouds (MCs) from a simulation of supernova-driven interstellar medium (ISM) turbulence with real MCs from the Outer Galaxy Survey. The radiative transfer calculations to compute synthetic CO spectra are…

Astrophysics of Galaxies · Physics 2016-08-03 Paolo Padoan , Mika Juvela , Liubin Pan , Troels Haugbølle , Åke Nordlund

We present recent developments of global galactic-scale numerical models of the Cosmic Ray (CR) driven dynamo, which was originally proposed by Parker (1992). We conduct a series of direct CR+MHD numerical simulations of the dynamics of the…

Astrophysics of Galaxies · Physics 2015-05-27 Michał Hanasz , Dominik Wóltański , Kacper Kowalik , Hanna Kotarba

We use numerical simulations to analyze the evolution and properties of superbubbles (SBs), driven by multiple supernovae (SNe), that propagate into the two-phase (warm/cold), cloudy interstellar medium (ISM). We consider a range of mean…

Astrophysics of Galaxies · Physics 2017-01-04 Chang-Goo Kim , Eve C. Ostriker , Roberta Raileanu

We have performed time-dependent numerical simulations of the interstellar medium (ISM) which account for galactic shear and magnetic fields, vertical gravity, and a radiative cooling function for atomic gas. This allows us to study the…

Astrophysics · Physics 2011-02-11 Robert A. Piontek , Eve C. Ostriker

Dust grains are an important component of the interstellar medium (ISM) of galaxies. We present the first direct measurement of the residence times of interstellar dust in the different ISM phases, and of the transition rates between these…

Using analytic methods and $1$-D two-fluid simulations, we study the effect of cosmic rays (CRs) on the dynamics of interstellar superbubbles (ISBs) driven by multiple supernovae (SNe)/stellar winds in OB associations. In addition to CR…

Astrophysics of Galaxies · Physics 2017-11-08 Siddhartha Gupta , Biman B. Nath , Prateek Sharma , David Eichler

We present new 3D magnetohydrodynamic (MHD) simulations of a supernova-driven, stratified interstellar medium. These simulations were run using the Waagan (2009) positivity preserving scheme for ideal MHD implemented in the Flash code. The…

Galaxy evolution and star formation are two multi-scale problems tightly linked to each other. To understand the interstellar cycle, which triggers galaxy evolution, it is necessary to describe simultaneously the large-scale evolution…

Astrophysics of Galaxies · Physics 2017-08-16 Olivier Iffrig , Patrick Hennebelle

Using three-dimensional magnetohydrodynamics simulations, we show that the efficiency of cosmic-ray (CR) production at supernova remnants (SNRs) is over-predicted if it could be estimated based on proper motion measurements of H$\alpha$…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Jiro Shimoda , Tsuyoshi Inoue , Yutaka Ohira , Ryo Yamazaki , Aya Bamba , Jacco Vink

Ram pressure stripping (RPS) is a process that removes the interstellar medium (ISM) quickly, playing a vital role in galaxy evolution. Previous RPS studies have treated the ISM as single-phase or lack the resolution and physical processes…

Astrophysics of Galaxies · Physics 2022-09-14 Woorak Choi , Chang-Goo Kim , Aeree Chung

Low-energy cosmic rays (CRs) are confined by self-generated MHD waves in the mostly neutral ISM. We show that the CR transport equation can be expressed as a continuity equation for the CR number density involving an effective convection…

Astrophysics · Physics 2009-11-10 Paolo Padoan , John Scalo

Cosmic rays (CRs) are the primary driver of ionization in star forming molecular clouds (MCs). Despite their potential impacts on gas dynamics and chemistry, no simulations of star cluster formation following the creation of individual…

Astrophysics of Galaxies · Physics 2024-07-26 Margot Fitz Axen , Stella Offner , Phillip F. Hopkins , Mark R. Krumholz , Michael Y. Grudic

We aim to elucidate cosmic ray (CR) propagation in the weakly ionized environments of supernova remnants (SNRs) basing our analysis on the cosmic ray cloud (CRC) model developed by \citet{2013ApJ...768...73M} and…

High Energy Astrophysical Phenomena · Physics 2020-01-15 L. Brahimi , A. Marcowith , V. S. Ptuskin

We explore the self-regulation of star formation using a large suite of high resolution hydrodynamic simulations, focusing on molecule-dominated regions (galactic centers and [U]LIRGS) where feedback from star formation drives highly…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-05 Rahul Shetty , Eve C. Ostriker

We present a dynamical model of supernova feedback which follows the evolution of pressurised bubbles driven by supernovae in a multi-phase interstellar medium (ISM). The bubbles are followed until the point of break-out into the halo,…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 Claudia del P. Lagos , Cedric G. Lacey , Carlton M. Baugh

We performed three-dimensional magnetohydrodynamic simulations to study the evolution of a supernova remnant (SNR) in a turbulent neutral atomic interstellar medium. The media used as background shares characteristics with the Solar…

Astrophysics of Galaxies · Physics 2019-10-16 Marco A. Villagran , P. F. Velázquez , D. O. Gómez , E. B. Giacani

We present cosmological radiation-hydrodynamic simulations, performed with the code Ramses-RT, of radiatively-driven outflows in a massive quasar host halo at $z = 6$. Our simulations include both single- and multi-scattered radiation…

Astrophysics of Galaxies · Physics 2018-06-13 Tiago Costa , Joakim Rosdahl , Debora Sijacki , Martin G. Haehnelt