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First, the formation of first objects driven by dark matter is revisited by high-resolution hydrodynamic simulations. It is revealed that dark matter haloes of ~10^4M_sun can produce first luminous objects with the aid of dark matter cusps.…

星系天体物理 · 物理学 2012-10-30 Masayuki Umemura , Hajime Susa , Kenji Hasegawa , Tamon Suwa , Benoit Semelin

We present SPICE, a new suite of RHD cosmological simulations targeting the epoch of reionisation. The goal of these simulations is to systematically probe a variety of stellar feedback models, including "bursty" and "smooth" forms of…

星系天体物理 · 物理学 2024-10-23 Aniket Bhagwat , Tiago Costa , Benedetta Ciardi , Rüdiger Pakmor , Enrico Garaldi

We compare the properties of galaxies that form in a cosmological simulation without strong feedback to observations at z=0. We confirm previous findings that models without strong feedback overproduce the observed galaxy baryonic mass…

宇宙学与河外天体物理 · 物理学 2015-05-13 Dušan Kereš , Neal Katz , Romeel Dave , Mark Fardal , David H. Weinberg

One model for the origin of typical galactic star clusters such as the Orion Nebula Cluster (ONC) is that they form via the rapid, efficient collapse of a bound gas clump within a larger, gravitationally-unbound giant molecular cloud.…

星系天体物理 · 物理学 2015-05-27 Mark R. Krumholz , Richard I. Klein , Christopher F. McKee

Understanding the formation of stellar clusters requires following the interplay between gas and newly formed stars accurately. We therefore couple the magnetohydrodynamics code FLASH to the N-body code ph4 and the stellar evolution code…

We present results on the star cluster properties from a series of high resolution smoothed particles hydrodynamics (SPH) simulations of isolated dwarf galaxies as part of the GRIFFIN project. The simulations at sub-parsec spatial…

We simulate the formation of second-generation stars in young clusters with masses of $10^{5}$ and $10^6\ {\rm M_\odot}$ within $30-100\ {\rm Myr}$ after the formation of clusters. We assume the clusters move through a uniform interstellar…

星系天体物理 · 物理学 2023-12-13 Asiyeh Yaghoobi , Joakim Rosdahl , Francesco Calura , Sareh Ataiee

Motivated by recent observations of the star formation rate density function out to z~7, we describe a simple model for the star formation rate density function at high redshift based on the extended Press-Schechter formalism. This model…

宇宙学与河外天体物理 · 物理学 2015-06-11 Stuart Wyithe , Abraham Loeb

Context. Understanding the conditions in which stars and stellar clusters form is of great importance. In particular the role that stellar feedback may have is still hampered by large uncertainties. Aims. We investigate the role played by…

星系天体物理 · 物理学 2022-07-20 Antoine Verliat , Patrick Hennebelle , Marta González , Yueh-Ning Lee , Sam Geen

We present a novel method to model galactic scale star formation and the resulting emission from star clusters and the multi-phase interstellar medium. We combine global parameters, such as SFR and CMF, with {\sc warpfield} which provides a…

We investigate how the way galaxies acquire their gas across cosmic time in cosmological hydrodynamic simulations is modified by a comprehensive physical model for baryonic feedback processes. To do so, we compare two simulations -- with…

宇宙学与河外天体物理 · 物理学 2015-06-23 Dylan Nelson , Shy Genel , Mark Vogelsberger , Volker Springel , Debora Sijacki , Paul Torrey , Lars Hernquist

We investigate the impact of galactic outflow modelling on the formation and evolution of a disc galaxy, by performing a suite of cosmological simulations with zoomed-in initial conditions of a Milky Way-sized halo. We verify how sensitive…

Using a new numerical model for cosmic chemical evolution, we study the influence of hypernova feedback on the star formation and metal enrichment history of the universe. For assumptions which produce plausible results in idealized…

天体物理学 · 物理学 2008-11-26 Chiaki Kobayashi , Volker Springel , Simon D. M. White

By performing three-dimensional radiation hydrodynamics simulations, we study the formation of young massive star clusters (YMCs, $M_{*}>10^4~M_{\odot}$) in clouds with the surface density ranging from $\Sigma_{\rm cl} = 80$ to…

星系天体物理 · 物理学 2021-08-18 Hajime Fukushima , Hidenobu Yajima

We introduce a new suite of simulations, "The Cloud Factory", which self-consistently forms molecular cloud complexes at high enough resolution to resolve internal substructure (up to 0.25 Msol in mass) all while including galactic-scale…

We explore when supernovae can (and cannot) regulate the star formation and bulge growth in galaxies based on a sample of 18 simulated galaxies. The simulations include key physics such as evaporation and conduction, neglected in prior…

星系天体物理 · 物理学 2016-08-17 B. W. Keller , J. Wadsley , H. M. P Couchman

Population III (Pop III) stars are the first generation of stars to form in the universe, emerging from primordial gas composed mainly of hydrogen and helium. They play a crucial role in ending the cosmic dark ages and initiating…

星系天体物理 · 物理学 2026-05-27 Bipradeep Saha , Rahul Kannan , Giovanni M. Mirouh

We present cosmological hydrodynamical simulations of eight Milky Way-sized haloes that have been previously studied with dark matter only in the Aquarius project. For the first time, we employ the moving-mesh code AREPO in zoom simulations…

宇宙学与河外天体物理 · 物理学 2015-06-16 Federico Marinacci , Ruediger Pakmor , Volker Springel

Milky Way-type galaxies are surrounded by a warm-hot gaseous halo containing a considerable amount of baryons and metals. The kinematics and spatial distribution of highly-ionized ion species such as \ion{O}{6} can be significantly affected…

We analyze the far-ultraviolet spectroscopy of 20 young and massive star clusters (YSCs) in 11 nearby star-forming galaxies. We probe the interstellar gas intervening along the line of sight, detecting several metal absorption lines of a…