Open Access
Dwarf galaxies, cold dark matter, and biased galaxy formation
Avishai Dekel,Joseph Silk +1 more
- 01 Jan 1985
- Iss: 117
1.4K
TL;DR: In this article, a reexamination is conducted of the formation of dwarf, diffuse, metal-poor galaxies due to supernova-driven winds, in view of data on the systematic properties of dwarfs in the Local Group and Virgo Cluster.
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Abstract: A reexamination is conducted of the formation of dwarf, diffuse, metal-poor galaxies due to supernova-driven winds, in view of data on the systematic properties of dwarfs in the Local Group and Virgo Cluster. The critical condition for global gas loss as a result of the first burst of star formation is that the virial velocity lie below an approximately 100 km/sec critical value. This leads, as observed, to two distinct classes of galaxies, encompassing the diffuse dwarfs, which primarily originate from typical density perturbations, and the normal, brighter galaxies, including compact dwarfs, which can originate only from the highest density peaks. This furnishes a statistical biasing mechanism for the preferential formation of bright galaxies in denser regions, enhancing high surface brightness galaxies' clustering relative to the diffusive dwarfs.
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Citations
Simulations of the formation, evolution and clustering of galaxies and quasars
Volker Springel,Simon D. M. White,Adrian Jenkins,Carlos S. Frenk,Naoki Yoshida,Liang Gao,Julio F. Navarro,Robert J. Thacker,Darren J. Croton,John C. Helly,John A. Peacock,Shaun Cole,Peter A. Thomas,Hugh M. P. Couchman,August E. Evrard,Jörg M. Colberg,Frazers Pearce +16 more
TL;DR: It is shown that baryon-induced features in the initial conditions of the Universe are reflected in distorted form in the low-redshift galaxy distribution, an effect that can be used to constrain the nature of dark energy with future generations of observational surveys of galaxies.
Dark Matter Substructure within Galactic Halos
Ben Moore,Sebastiano Ghigna,Fabio Governato,George Lake,Thomas R. Quinn,Joachim Stadel,Paolo Tozzi +6 more
TL;DR: In this article, the substructure clumps are on orbits that take a large fraction of them through the stellar disk, leading to significant resonant and impulsive heating, and the model predicts that the virialized extent of the Milky Way's halo should contain about 500 satellites with circular velocities larger than the Draco and Ursa Minor systems, i.e., bound masses 108 M☉ and tidally limited sizes 1 kpc.
3.6K
Where are the missing galactic satellites
TL;DR: In this paper, the authors compare the observed and predicted VDFs cross at B50 km s~1, indicating that the predicted abundance of satellites with km s-1 V circ Z 50 is in reasonably good agreement with observations.
Dwarf galaxies of the local group
TL;DR: The Local Group dwarfs offer a unique window to the detailed properties of the most common type of galaxy in the Universe as mentioned in this paper. But, the local group dwarfs are not suitable for direct observation.
•Posted Content
Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies: Supplemental Material
John Kormendy,Luis C. Ho +1 more
TL;DR: Kormendy and Ho as mentioned in this paper proposed a method to estimate the BH masses for galaxies with active nuclei (AGNs) based on the observational criteria that are used to classify classical and pseudo bulges.
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References
Halo Substructure and the Power Spectrum
TL;DR: In this paper, a semianalytic model was proposed to investigate the merger history, destruction rate, and survival probability of substructure in hierarchically formed dark matter halos and use it to study the substructure content of halos as a function of input primordial power spectrum.
Galaxy Populations and Evolution in Clusters. I. Dynamics and the Origin of Low-Mass Galaxies in the Virgo Cluster
Christopher J. Conselice,Christopher J. Conselice,Christopher J. Conselice,John S. Gallagher,John S. Gallagher,Rosemary F. G. Wyse +5 more
TL;DR: Early-type dwarfs are the most common galaxy in the local universe, yet their origin and evolution remain a mystery as discussed by the authors, and it is known that these galaxies are not an old cluster population but have signatures of production from the infall of field galaxies.
Hot Galactic Winds Constrained by the X-Ray Luminosities of Galaxies
TL;DR: In this article, the authors use the Chevalier & Clegg (CC85) wind model and the observed correlation between X-ray luminosities of galaxies and their SFRs to constrain the mass loss rates across a wide range of star formation rates, from dwarf starbursts to ultra-luminous infrared galaxies.
Cosmic evolution of stellar quenching by AGN feedback: clues from the Horizon-AGN simulation
R. S. Beckmann,Julien Devriendt,Adrianne Slyz,Sébastien Peirani,M. L. A. Richardson,Yohan Dubois,Christophe Pichon,Christophe Pichon,Nora Elisa Chisari,Sugata Kaviraj,Clotilde Laigle,Marta Volonteri +11 more
TL;DR: In this paper, the authors investigate how active galactic nuclei feedback can account for a reduction in the stellar content of massive galaxies, through an influence on the gas content of their interstellar (ISM) and circum-galactic medium (CGM).
Probing particle physics with IceCube
TL;DR: In this article, the authors give an overview of the various possibilities how IceCube can address fundamental questions related to the phenomena of neutrino oscillations and interactions, the origin of dark matter, and the existence of exotic relic particles like monopoles.
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