46 citations · 210 across the 22 of their papers we have counts for
24 papers
The Potential Contribution of Radiative Supernova Remnants to the Local Cosmic Ray Spectrum
P. Cristofari, V. H. M. Phan, S. Recchia +1
Recent observations of very-high-energy gamma rays from massive stellar clusters and microquasars have demonstrated that these systems can efficiently accelerate particles to very…
Variational Inference Using a Differentiable Multigrid Linear Solver
Andrés Ramírez, Philipp Haim, David Föger +9
Gradient-based Bayesian inference methods require efficient access to Jacobian and adjoint-Jacobian operators of high-dimensional forward models. While multigrid solvers provide ne…
A Three-Dimensional Tomographic Reconstruction of the Galactic Cosmic-Ray Proton Density
Hanieh Zandinejad, Jakob Roth, Vo Hong Minh Phan +7
Cosmic rays (CRs) are a ubiquitous non-thermal component of the interstellar medium (ISM). A data-driven three-dimensional (3D) map of their distribution is essential for understan…
Can cosmic rays explain the high ionisation rates in the Galactic centre?
Sruthiranjani Ravikularaman, Sarah Recchia, Vo Hong Minh Phan +1
The Central Molecular Zone (CMZ), located in the centre of the Milky Way, is a roughly cylindrical structure of molecular gas extending up to parsecs around the supermassive black…
Transient gamma rays from the 2021 outburst of the recurrent nova RS Ophiuchi: the effect of gamma-ray absorption
Vo Hong Minh Phan, Pierre Cristofari, Enrico Peretti +2
In 2021, RS Ophiuchi was the first nova to be detected in the very-high-energy (TeV) gamma-ray domain, directly testifying of efficient acceleration of charged particles up to at l…
Spatially Coherent 3D Distributions of HI and CO in the Milky Way
Laurin Söding, Gordian Edenhofer, Torsten A. Enßlin +6
The spatial distribution of the gaseous components of the Milky Way is of great importance for a number of different fields, for example, Galactic structure, star formation, and co…
The influence of the 3D Galactic gas structure on cosmic-ray transport and -ray emission
Andrés Ramírez, Gordian Edenhofer, Torsten A. Enßlin +6
Cosmic rays (CRs) play a major role in the dynamics of the interstellar medium (ISM). Their interactions and transport ionize, heat, and push the ISM thereby coupling different reg…
Cosmic rays cannot explain the high ionisation rates in the Galactic centre
Sruthiranjani Ravikularaman, Sarah Recchia, Vo Hong Minh Phan +1
The H ionisation rate in the central molecular zone, located in the Galactic centre, is estimated to be , based on observations of H…
Cosmic-ray induced ionization rates and non-thermal emissions from nuclei of starburst galaxies
Vo Hong Minh Phan, Enrico Peretti, Pierre Cristofari +2
Cosmic rays are the only agent capable of ionizing the interior of dense molecular clouds and, thus, they are believed to play an essential role in determining the physical and che…
Bayesian inference of 3D densities of galactic HI and H2
Laurin Söding, Philipp Mertsch, Vo Hong Minh Phan
Due to our vantage point in the disk of the Galaxy, its 3D structure is not directly accessible. However, knowing the spatial distribution, e.g. of atomic and molecular hydrogen ga…
Unstable cosmic-ray nuclei constrain low-diffusion zones in the Galactic disk
Hanno Jacobs, Philipp Mertsch, Vo Hong Minh Phan
Observations of the vicinity of a variety of galactic gamma-ray sources have indicated a local suppression of diffusivity of cosmic rays by up to three orders of magnitude. However…
Internal and external alignment of carbonaceous grains within the radiative torque paradigm
Thiem Hoang, Vo Hong Minh Phan, Le Ngoc Tram
We study the internal and external alignment of carbonaceous grains, including graphite and hydrogenated amorphous carbon (HAC), in the interstellar medium (ISM) within the RAdiati…
Diffusion of relativistic charged particles and field lines in isotropic turbulence: II. Analytical models
Marco Kuhlen, Vo Hong Minh Phan, Philipp Mertsch
The transport of high-energy particles in the presence of small-scale, turbulent magnetic fields is a long-standing issue in astrophysics. Analytical theories on transport perpendi…
Diffusion of relativistic charged particles and field lines in isotropic turbulence: I. Numerical simulations
Marco Kuhlen, Vo Hong Minh Phan, Philipp Mertsch
The transport of non-thermal particles across a large-scale magnetic field in the presence of magnetised turbulence has been a long-standing issue in high-energy astrophysics. Of p…
Stochasticity of Cosmic Rays from Supernova Remnants and the Ionization Rates in Molecular Clouds
Vo Hong Minh Phan, Sarah Recchia, Philipp Mertsch +1
Cosmic rays are the only agent able to penetrate into the interior of dense molecular clouds. Depositing (part of) their energy through ionisation, cosmic rays play an essential ro…
Bayesian inference of three-dimensional gas maps: II. Galactic HI
Philipp Mertsch, Vo Hong Minh Phan
The 21-cm emission from atomic hydrogen (HI) is one of the most important tracers of the structure and dynamics of the interstellar medium. Thanks to Galactic rotation, the line is…
Self-confinement of low-energy cosmic rays around supernova remnants
Hanno Jacobs, Philipp Mertsch, Vo Hong Minh Phan
Supernova remnants have long been considered as a promising candidate for sources of Galactic cosmic rays. However, modelling cosmic-ray transport around these sources is complicat…
No longer ballistic, not yet diffusive--the formation of cosmic ray small-scale anisotropies
Marco Kuhlen, Vo Hong Minh Phan, Philipp Mertsch
The arrival directions of TeV-PeV cosmic rays are remarkably uniform due to the isotropization of their directions by scattering on turbulent magnetic fields. Small anisotropies ca…
Erosion of Icy Interstellar Objects by Cosmic Rays and Implications for `Oumuamua
Vo Hong Minh Phan, Thiem Hoang, Abraham Loeb
We study the destruction and modification of icy interstellar objects by cosmic rays and gas collisions. Using the cosmic-ray flux measured in the local interstellar medium as well…
Cosmic Ray Small Scale Anisotropies in Slab Turbulence
Marco Kuhlen, Philipp Mertsch, Vo Hong Minh Phan
In the standard picture of cosmic ray transport the propagation of charged cosmic rays through turbulent magnetic fields is described as a random walk with cosmic rays scattering o…
Stochastic Fluctuations of Low-Energy Cosmic Rays and the Interpretation of Voyager Data
Vo Hong Minh Phan, Florian Schulze, Philipp Mertsch +2
Data from the Voyager probes have provided us with the first measurement of cosmic ray intensities at MeV energies, an energy range which had previously not been explored. Simple e…
Constraining the cosmic ray spectrum in the vicinity of the supernova remnant W28: from sub-GeV to multi-TeV energies
V. H. M. Phan, S. Gabici, G. Morlino +4
Supernova remnants interacting with molecular clouds are ideal laboratories to study the acceleration of particles at shock waves and their transport and interactions in the surrou…
Can a cosmic ray carrot explain the ionization level in diffuse molecular clouds?
S. Recchia, V. H. M. Phan, S. Biswas +1
Low energy cosmic rays are the major ionization agents of molecular clouds. However, it has been shown that, if the cosmic ray spectrum measured by Voyager 1 is representative of t…
What causes the ionization rates observed in molecular clouds? The role of cosmic ray protons and electrons
V. H. M. Phan, G. Morlino, S. Gabici
Cosmic rays are usually assumed to be the main ionization agent for the interior of molecular clouds where UV and X-ray photons cannot penetrate. Here we test this hypothesis by li…