Christophe Pichon
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View article: Introducing NewCluster: First half of the history of a high-resolution cluster simulation
Introducing NewCluster: First half of the history of a high-resolution cluster simulation Open
We introduce a novel high-resolution cluster simulation designed to serve as the massive halo counterpart of the modern cosmological galaxy evolution framework. The zoom-in simulation targets a volume of 4.1σ overdensity region, which is e…
View article: The topology of Rayleigh-Levy flights in two dimensions
The topology of Rayleigh-Levy flights in two dimensions Open
Rayleigh-Lévy flights are simplified cosmological tools that capture certain essential statistical properties of the cosmic density field, including hierarchical structures in higher-order correlations, making them a valuable reference for…
View article: The dwarf stellar mass function in different environments and the lack of a generic missing dwarfs problem in ΛCDM
The dwarf stellar mass function in different environments and the lack of a generic missing dwarfs problem in ΛCDM Open
We combine deep photometric data in the COSMOS and XMM-LSS fields with high-resolution cosmological hydrodynamical simulations to explore two key questions: (1) how does the galaxy stellar mass function, particularly in the dwarf ($M_\star…
View article: How Dust Models Shape High-<i>z</i> Galaxy Morphology: Insights from the NewCluster Simulation
How Dust Models Shape High-<i>z</i> Galaxy Morphology: Insights from the NewCluster Simulation Open
Dust plays a pivotal role in shaping the observed morphology of galaxies. While traditional cosmological simulations often assume a fixed dust-to-gas or dust-to-metal (DTM) mass ratio to model dust effects, recent advancements have enabled…
View article: Tracing the Formation History of Intrahalo Light with Horizon Run 5
Tracing the Formation History of Intrahalo Light with Horizon Run 5 Open
We investigate the formation history of intrahalo light (IHL) using the high-resolution (∼1 kpc), large-scale (∼1 Gpc) cosmological hydrodynamical simulation Horizon Run 5 (HR5). IHL particles are identified by carefully considering both t…
View article: Born to be Starless: Revisiting the Missing Satellite Problem
Born to be Starless: Revisiting the Missing Satellite Problem Open
The two massive galaxies in the Local Group both host substantially fewer satellites than the subhalos expected from the cold dark matter paradigm, and recent investigations have highlighted the interplay between baryons and dark matter. W…
View article: Non-Gaussian Expansion of Minkowski Tensors in Redshift Space
Non-Gaussian Expansion of Minkowski Tensors in Redshift Space Open
This paper focuses on extending the use of Minkowski Tensors to analyze anisotropic signals in cosmological data, focusing on those introduced by redshift space distortion. We derive the ensemble average of the two translation-invariant, r…
View article: Euclid Quick Data Release (Q1). Galaxy shapes and alignments in the cosmic web
Euclid Quick Data Release (Q1). Galaxy shapes and alignments in the cosmic web Open
Galaxy morphologies and shape orientations are expected to correlate with their large-scale environments, since they grow by accreting matter from the cosmic web and are subject to interactions with other galaxies. We extracted cosmic fila…
View article: Cosmic reflections I: the structural diversity of simulated and observed low-mass galaxy analogues
Cosmic reflections I: the structural diversity of simulated and observed low-mass galaxy analogues Open
Dwarf galaxies serve as powerful laboratories for investigating the underlying physics of galaxy evolution including the impact of baryonic feedback processes and external environmental influences. We compare the visual and structural prop…
View article: Linear Response of Rotating and Flattened Stellar Clusters: The Oblate Kuzmin–Kutuzov Stäckel Family
Linear Response of Rotating and Flattened Stellar Clusters: The Oblate Kuzmin–Kutuzov Stäckel Family Open
This paper investigates the linear response of a series of spheroidal stellar clusters, the Kuzmin–Kutuzov Stäackel family, which exhibit a continuous range of flattening and rotation, extending from an isochrone sphere to a Toomre disk. T…
View article: The long-term evolution of razor-thin galactic discs: Balescu–Lenard prediction and perspectives
The long-term evolution of razor-thin galactic discs: Balescu–Lenard prediction and perspectives Open
In the last five decades, numerical simulations have provided invaluable insights into the evolution of galactic discs over cosmic times. As a complementary approach, developments in kinetic theory now also offer a theoretical framework to…
View article: The Level of Stress Management Among Athletics Student-Athletes in Cluster 14, Davao City, Philippines
The Level of Stress Management Among Athletics Student-Athletes in Cluster 14, Davao City, Philippines Open
View article: The diversity of rotation curves of galaxies in the <scp>NewHorizon</scp> cosmological simulation
The diversity of rotation curves of galaxies in the <span>NewHorizon</span> cosmological simulation Open
We use the cosmological hydrodynamical simulation NewHorizon to study the effects of the baryonic component on the inner mass profile of dark matter haloes of isolated galaxies ($10^6< M_*/\mathrm{ M}_\odot < 10^{11.5}$). Dark matter…
View article: Zippers and Twisters: Planes of Satellite Galaxies Emerge from Whirling and Shocking Gas Streams in the Cosmic Web
Zippers and Twisters: Planes of Satellite Galaxies Emerge from Whirling and Shocking Gas Streams in the Cosmic Web Open
We investigate dwarf satellite systems around Milky Way analogs in the NewHorizon simulation. Using simple estimators limiting over-detection, we identify planes of satellites comparable to observations in $30\%$ to $70\%$ of cases. The fu…
View article: Euclid Quick Data Release (Q1). The role of cosmic connectivity in shaping galaxy clusters
Euclid Quick Data Release (Q1). The role of cosmic connectivity in shaping galaxy clusters Open
The matter distribution around galaxy clusters is distributed over several filaments, reflecting their positions as nodes in the large-scale cosmic web. The number of filaments connected to a cluster, namely its connectivity, is expected t…
View article: Dissecting the formation of gas-versus-star counter-rotating galaxies from the NewHorizon simulation
Dissecting the formation of gas-versus-star counter-rotating galaxies from the NewHorizon simulation Open
Gas-versus-star counter-rotating galaxies are characterized by the presence of a disk of stars and a disk of gas that are co-spatial but rotating in opposite directions. Using the N EW H ORIZON simulation, we identified and studied ten suc…
View article: On the long-term evolution of razor-thin galactic discs: Balescu-Lenard prediction and perspectives
On the long-term evolution of razor-thin galactic discs: Balescu-Lenard prediction and perspectives Open
In the last five decades, numerical simulations have provided invaluable insights into the evolution of galactic discs over cosmic times. As a complementary approach, developments in kinetic theory now also offer a theoretical framework to…
View article: 2D light distributions of dwarf galaxies – key tests of the implementation of physical processes in simulations
2D light distributions of dwarf galaxies – key tests of the implementation of physical processes in simulations Open
Cosmological simulations provide much of the theoretical framework within which we interpret extragalactic observations. However, even if a given simulation reproduces the integrated properties of galaxies well, it may not reproduce the de…
View article: 2D light distributions of dwarf galaxies -- key tests of the implementation of physical processes in simulations
2D light distributions of dwarf galaxies -- key tests of the implementation of physical processes in simulations Open
Cosmological simulations provide much of the theoretical framework within which we interpret extragalactic observations. However, even if a given simulation reproduces the integrated properties of galaxies well, it may not reproduce the de…
View article: Linear response of rotating and flattened stellar clusters: the oblate Kuzmin-Kutuzov Stäckel family
Linear response of rotating and flattened stellar clusters: the oblate Kuzmin-Kutuzov Stäckel family Open
This paper investigates the linear response of a series of spheroidal stellar clusters, the Kuzmin-Kutuzov Stäckel family, which exhibit a continuous range of flattening and rotation, extending from an isochrone sphere to a Toomre disk. Th…
View article: Exploring Lenticular Galaxy Formation in Field Environments Using NewHorizon: Evidence for Counterrotating Gas Accretion as a Formation Channel
Exploring Lenticular Galaxy Formation in Field Environments Using NewHorizon: Evidence for Counterrotating Gas Accretion as a Formation Channel Open
The formation pathways of lenticular galaxies (S0s) in field environments remain a matter of debate. We utilize the cosmological hydrodynamic simulation, NewHorizon , to investigate the issue. We select two massive star formation quenched …
View article: Emergence of the Galaxy Morphology–Star Formation Activity–Clustercentric Radius Relations in Galaxy Clusters
Emergence of the Galaxy Morphology–Star Formation Activity–Clustercentric Radius Relations in Galaxy Clusters Open
We investigate when and how the relations of galaxy morphology and star-forming activity with clustercentric radius become evident in galaxy clusters. We identify 162 galaxy clusters with total mass at z = 0.625 in the…
View article: Black hole spin evolution across cosmic time from the <scp>NewHorizon</scp> simulation
Black hole spin evolution across cosmic time from the <span>NewHorizon</span> simulation Open
Astrophysical black holes (BHs) have two fundamental properties: mass and spin. While the mass-evolution of BHs has been extensively studied, much less work has been done on predicting the distribution of BH spins. In this paper, we presen…
View article: New tools for studying planarity in galaxy satellite systems: Milky Way satellite planes are consistent with ΛCDM
New tools for studying planarity in galaxy satellite systems: Milky Way satellite planes are consistent with ΛCDM Open
We introduce a new concept – termed ‘planarity’ – which aims to quantify planar structure in galaxy satellite systems without recourse to the number or thickness of planes. We use positions and velocities from the Gaia EDR3 to measure plan…
View article: Emergence of the Galaxy Morphology-Star Formation Activity-Clustercentric Radius Relations in Galaxy Clusters
Emergence of the Galaxy Morphology-Star Formation Activity-Clustercentric Radius Relations in Galaxy Clusters Open
We investigate when and how the relations of galaxy morphology and star forming activity with clustercentric radius become evident in galaxy clusters. We identify 162 galaxy clusters with total mass $M_{\rm tot}^{\rm cl} > 5 \times 10^{13}…
View article: Tracing the Formation History of Intrahalo Light with Horizon Run 5
Tracing the Formation History of Intrahalo Light with Horizon Run 5 Open
We investigate the formation history of intrahalo light (IHL) using the high-resolution (~1 kpc), large-scale (~Gpc) cosmological hydrodynamical simulation, Horizon Run 5 (HR5). IHL particles are identified by carefully considering both th…
View article: Exploring lenticular galaxy formation in field environments using NewHorizon: evidence for counter-rotating gas accretion as a formation channel
Exploring lenticular galaxy formation in field environments using NewHorizon: evidence for counter-rotating gas accretion as a formation channel Open
The formation pathways of lenticular galaxies (S0s) in field environments remain a matter of debate. We utilize the cosmological hydrodynamic simulation, NewHorizon, to investigate the issue. We select two massive star-formation quenched S…
View article: Testing Lyα Emitters and Lyman-break Galaxies as Tracers of Large-scale Structures at High Redshifts
Testing Lyα Emitters and Lyman-break Galaxies as Tracers of Large-scale Structures at High Redshifts Open
We test whether Lyα emitters (LAEs) and Lyman-break galaxies (LBGs) can be good tracers of high- z large-scale structures, using the Horizon Run 5 cosmological hydrodynamical simulation. We identify LAEs using the Ly α emission line lumino…
View article: On the Origin of Star Formation Quenching of Galaxies in Group Environments using the NewHorizon simulation
On the Origin of Star Formation Quenching of Galaxies in Group Environments using the NewHorizon simulation Open
We study star formation (SF) quenching of satellite galaxies with $M_{*} > 10^7\,M_{\odot}$ within two low-mass groups ($M_{\rm vir}=10^{12.9}$ and $10^{12.7} \,M_{\odot}$) using the NewHorizon simulation. We confirm that satellite galaxie…
View article: On the Origin of Star Formation Quenching of Galaxies in Group Environments Using the NewHorizon Simulation
On the Origin of Star Formation Quenching of Galaxies in Group Environments Using the NewHorizon Simulation Open
We study star formation (SF) quenching of satellite galaxies with M * > 10 7 M ⊙ within two low-mass groups ( M vir = 10 12.9 and 10 12.7 M ⊙ ) using the NewHorizon simulation. We confirm that satellite galaxies ( M * ≲ 10 10 M ⊙ ) are mor…