Publications by Julien Devriendt


Zooming in on supermassive black holes: how resolving their gas cloud host renders their accretion episodic

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2018)

RS Beckmann, J Devriendt, A Slyz

Born in rapidly evolving mini-halos during the first billion years of the Universe, super- massive black holes (SMBH) feed from gas flows spanning many orders of magnitude, from the cosmic web in which they are embedded to their event horizon. As such, accretion onto SMBHs constitutes a formidable challenge to tackle numerically, and currently requires the use of sub-grid models to handle the flow on small, unresolved scales. In this paper, we study the impact of resolution on the accretion pattern of SMBHs initially inserted at the heart of dense galactic gas clouds, using a custom super-Lagrangian refinement scheme to resolve the black hole (BH) gravitational zone of influence. We find that once the self-gravitating gas cloud host is sufficiently well re- solved, accretion onto the BH is driven by the cloud internal structure, independently of the BH seed mass, provided dynamical friction is present during the early stages of cloud collapse. For a pristine gas mix of hydrogen and helium, a slim disc develops around the BH on sub-parsec scales, turning the otherwise chaotic BH accretion duty cycle into an episodic one, with potentially important consequences for BH feedback. In the presence of such a nuclear disc, BH mass growth predominantly occurs when infalling dense clumps trigger disc instabilities, fuelling intense albeit short-lived gas accretion episodes.


Galaxies flowing in the oriented saddle frame of the cosmic web

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 483 (2019) 3227-3254

K Kraljic, C Pichon, Y Dubois, S Codis, C Cadiou, J Devriendt, M Musso, C Welker, S Arnouts, HS Hwang, C Laigle, S Peirani, A Slyz, M Treyer, D Vibert


Identifying the progenitors of present-day early-type galaxies in observational surveys: correcting 'progenitor bias' using the Horizon-AGN simulation

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 474 (2018) 3140-3151

G Martin, S Kaviraj, JEG Devriendt, Y Dubois, C Pichon, C Laigle


Galaxy orientation with the cosmic web across cosmic time

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 481 (2018) 4753-4774

S Codis, A Jindal, NE Chisari, D Vibert, Y Dubois, C Pichon, J Devriendt


Gas flows in the circumgalactic medium around simulated high-redshift galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473 (2018) 4279-4301

PD Mitchell, J Blaizot, J Devriendt, T Kimm, L Michel-Dansac, J Rosdahl, A Slyz


Galaxy evolution in the metric of the cosmic web

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 474 (2018) 547-571

K Kraljic, S Arnouts, C Pichon, C Laigle, S de la Torre, D Vibert, C Cadiou, Y Dubois, M Treyer, C Schimd, S Codis, V de Lapparent, J Devriendt, HS Hwang, D Le Borgne, N Malavasi, B Milliard, M Musso, D Pogosyan, M Alpaslan, J Bland-Hawthorn, AH Wright


A three-phase amplification of the cosmic magnetic field in galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 479 (2018) 3343-3365

S Martin-Alvarez, J Devriendt, A Slyz, R Teyssier


Caught in the rhythm I. How satellites settle into a plane around their central galaxy

ASTRONOMY & ASTROPHYSICS 613 (2018) ARTN A4

C Welker, Y Dubois, C Pichon, J Devriendt, NE Chisari


Cosmic CARNage II: the evolution of the galaxy stellar mass function in observations and galaxy formation models

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 480 (2018) 1197-1210

R Asquith, FR Pearce, O Almaini, A Knebe, V Gonzalez-Perez, A Benson, J Blaizot, J Carretero, FJ Castander, A Cattaneo, SA Cora, DJ Croton, JE Devriendt, F Fontanot, ID Gargiulo, W Hartley, B Henriques, J Lee, GA Mamon, J Onions, ND Padilla, C Power, C Srisawat, ARH Stevens, PA Thomas, CA Vega-Martinez, SK Yi


Using Real and Simulated Measurements of the Thermal Sunyaev-Zel'dovich Effect to Constrain Models of AGN Feedback

ASTROPHYSICAL JOURNAL 865 (2018) ARTN 109

A Spacek, MLA Richardson, E Scannapieco, J Devriendt, Y Dubois, S Peirani, C Pichon


Universality of the halo mass function in screened gravity theories

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2018) ARTN 028

F von Braun-Bates, J Devriendt


COSMOS2015 photometric redshifts probe the impact of filaments on galaxy properties

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473 (2018) 5437-5458

C Laigle, C Pichon, S Arnouts, HJ McCracken, Y Dubois, J Devriendt, A Slyz, D Le Borgne, A Benoit-Levy, HS Hwang, O Ilbert, K Kraljic, N Malavasi, C Park, D Vibert


Bondi or not Bondi: the impact of resolution on accretion and drag force modelling for supermassive black holes

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 478 (2018) 995-1016

RS Beckmann, A Slyz, J Devriendt


The role of mergers in driving morphological transformation over cosmic time

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2018)

G Martin, S Kaviraj, JEG Devriendt, Y Dubois, C Pichon

Understanding the processes that trigger morphological transformation is central to understanding how and why the Universe transitions from being disc-dominated at early epochs to having the morphological mix that is observed today. We use Horizon-AGN, a cosmological hydrodynamical simulation, to perform a comprehensive study of the processes that drive morphological change in massive (M > 10^10 MSun) galaxies over cosmic time. We show that (1) essentially all the morphological evolution in galaxies that are spheroids at z=0 is driven by mergers with mass ratios greater than 1:10, (2) major mergers alone cannot produce today's spheroid population -- minor mergers are responsible for a third of all morphological transformation over cosmic time and are its dominant driver after z~1, (3) prograde mergers trigger milder morphological transformation than retrograde mergers -- while both types of events produce similar morphological changes at z>2, the average change due to retrograde mergers is around twice that due to their prograde counterparts at z~0, (4) remnant morphology depends strongly on the gas fraction of a merger, with gas-rich mergers routinely re-growing discs, and (5) at a given stellar mass, discs do not exhibit drastically different merger histories from spheroids -- disc survival in mergers is driven by acquisition of cold gas (via cosmological accretion and gas-rich interactions) and a preponderance of prograde mergers in their merger histories.


The halo mass function in the cosmic web

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2017) ARTN 012

F von Braun-Bates, HA Winther, D Alonso, J Devriendt


Fluctuating feedback-regulated escape fraction of ionizing radiation in low-mass, high-redshift galaxies

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 470 (2017) 224-239

M Trebitsch, J Blaizot, J Rosdahl, J Devriendt, A Slyz


Implications of strong intergalactic magnetic fields for ultrahigh-energy cosmic-ray astronomy

PHYSICAL REVIEW D 96 (2017) ARTN 023010

RA Batista, M-S Shin, J Devriendt, D Semikoz, G Sigl


The limited role of galaxy mergers in driving stellar mass growth over cosmic time

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 472 (2017) L50-L54

G Martin, S Kaviraj, JEG Devriendt, Y Dubois, C Laigle, C Pichon


The new semi-analytic code GalICS 2.0-reproducing the galaxy stellar mass function and the Tully-Fisher relation simultaneously

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471 (2017) 1401-1427

A Cattaneo, J Blaizot, JEG Devriendt, GA Mamon, E Tollet, A Dekel, B Guiderdoni, M Kucukbas, ACR Thob


The Horizon-AGN simulation: evolution of galaxy properties over cosmic time

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 467 (2017) 4739-4752

S Kaviraj, C Laigle, T Kimm, JEG Devriendt, Y Dubois, C Pichon, A Slyz, E Chisari, S Peirani

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