Forming disc galaxies in ΛCDM simulations
Fabio Governato,Fabio Governato,Beth Willman,Lucio Mayer,Alyson Brooks,Gregory S. Stinson,Octavio Valenzuela,James Wadsley,Thomas R. Quinn +8 more
753
TL;DR: In this article, the authors used fully cosmological, high-resolution N-body + smooth particle hydrodynamic (SPH) simulations to follow the formation of disc galaxies with rotational velocities between 135 and 270km s -1 in a cold dark matter (CDM) universe.
read more
Abstract: We used fully cosmological, high-resolution N-body + smooth particle hydrodynamic (SPH) simulations to follow the formation of disc galaxies with rotational velocities between 135 and 270km s -1 in a A cold dark matter (CDM) universe. The simulations include gas cooling, star formation, the effects of a uniform ultraviolet (UV) background and a physically motivated description of feedback from supernovae (SNe). The host dark matter haloes have a spin and last major merger redshift typical of galaxy-sized haloes as measured in recent large-scale N-body simulations. The simulated galaxies form rotationally supported discs with realistic exponential scalelengths and fall on both the / band and baryonic Tully-Fisher relations. An extended stellar disc forms inside the Milky Way (MW)-sized halo immediately after the last major merger. The combination of UV background and SN feedback drastically reduces the number of visible satellites orbiting inside a MW-sized halo, bringing it in fair agreement with observations. Our simulations predict that the average age of a primary galaxy's stellar population decreases with mass, because feedback delays star formation in less massive galaxies. Galaxies have stellar masses and current star formation rates as a function of total mass that are in good agreement with observational data. We discuss how both high mass and force resolution and a realistic description of star formation and feedback are important ingredients to match the observed properties of galaxies.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Chemodynamical analysis of bulge stars for simulated disc galaxies
TL;DR: In this article, the authors analyse the kinematics and chemistry of the bulge stars of two simulated disc galaxies using their chemodynamical galaxy evolution code GCD+ and show that stars formed during one of the merger events retain a systematically prograde rotation at the final time.
1
The Challenge to MOND from ultra faint dwarf galaxies
TL;DR: In this article, the authors show that the ratio of tidal to internal acceleration in UFDs is extremely low, and there is no correlation between the deviation of UDFs from MOND's prediction as a function of tidal susceptibility, and recent constraints from Gaia proper motion analysis on the orbital parameters of the UFD's exacerbates the challenge to MOND.
1
On the Size Evolution of a Galactic Disk in Hierarchical Merging of Cold Dark Matter Halos
Hirohito Hayashi,Masashi Chiba +1 more
TL;DR: In this article, the authors investigated the dynamical effects of dark matter subhalos on the structure and evolution of a galactic disk, using semi-analytic method that includes approximated and empirical relations as achieved in detailed numerical simulations of the cold dark matter model.
1
Angular Momentum of Early and Late Type Galaxies: Nature or Nurture?
JingJing Shi,JingJing Shi,Andrea Lapi,Andrea Lapi,C. Mancuso,Huiyuan Wang,Luigi Danese,Luigi Danese +7 more
TL;DR: In this paper, the authors investigated the origin, shape, the scatter, and the cosmic evolution in the observed relationship between specific angular momentum and the stellar mass in early-type (ETGs) and late-type galaxies (LTGs).
1
Distinct distributions of elliptical and disk galaxies across the Local Supercluster as a ΛCDM prediction
TL;DR: The ΛCDM model predicts distinct distributions of elliptical and disk galaxies across the Local Supercluster, with ellipticals clustering near the supergalactic equator and disks distributed more randomly, consistent with galaxy formation theory and large-scale structure.
References
First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Determination of cosmological parameters
David N. Spergel,Licia Verde,Hiranya V. Peiris,Eiichiro Komatsu,M. R. Nolta,Charles L. Bennett,Mark Halpern,Gary Hinshaw,N. Jarosik,Alan J. Kogut,Michele Limon,Michele Limon,S. S. Meyer,Lyman A. Page,Gregory S. Tucker,Gregory S. Tucker,Gregory S. Tucker,Janet L. Weiland,Edward J. Wollack,Edward L. Wright +19 more
TL;DR: In this article, the authors find that the emerging standard model of cosmology, a flat -dominated universe seeded by a nearly scale-invariant adiabatic Gaussian fluctuations, fits the WMAP data.
The Global Schmidt law in star forming galaxies
TL;DR: In this paper, the Schmidt law was used to model the global star formation law over the full range of gas densities and star formation rates observed in galaxies, and the results showed that the SFR scales with the ratio of the gas density to the average orbital timescale.
6.1K
The Cosmological Constant and Dark Energy
P. J. E. Peebles,Bharat Ratra +1 more
TL;DR: A review of dark energy can be found in this paper, where the authors present the basic physics and astronomy of the subject, reviews the history of ideas, assesses the state of the observational evidence, and comments on recent developments in the search for a fundamental theory.
The Global Schmidt Law in Star Forming Galaxies
TL;DR: In this paper, the Schmidt law was used to model the global star formation law, over the full range of gas densities and star formation rates (SFRs) observed in galaxies.
4.7K
Smoothed particle hydrodynamics.
TL;DR: In this paper, the theory and application of Smoothed particle hydrodynamics (SPH) since its inception in 1977 are discussed, focusing on the strengths and weaknesses, the analogy with particle dynamics and the numerous areas where SPH has been successfully applied.
4.7K