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The origin of dwarf galaxies, cold dark matter, and biased galaxy formation
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Dwarf, diffuse, metal‑poor galaxies are thought to form via supernova‑driven winds, a hypothesis reexamined using new data on Local Group and Virgo Cluster dwarfs. Global gas loss occurs when a galaxy’s virial velocity falls below ≈100 km s⁻¹ during its first star‑formation burst. The authors show that dwarf luminosity–radius–metallicity relations arise naturally in dominant cold‑dark‑matter halos, that a 100 km s⁻¹ threshold splits galaxies into diffuse dwarfs from typical perturbations and brighter galaxies from high‑density peaks, and that this creates a statistical bias favoring bright galaxy formation in dense regions. Published in The Astrophysical Journal (April 1986), DOI 10.1086/164050.
view Abstract Citations (1872) References (80) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Origin of Dwarf Galaxies, Cold Dark Matter, and Biased Galaxy Formation Dekel, A. ; Silk, J. Abstract The formation of dwarf, diffuse, metal-poor galaxies as a result of supernova-driven winds is reexamined in view of the accumulating data on the systematic properties of dwarfs in the Local Group and in the Virgo Cluster. The observed luminosity-radius-metallicity relations are found to be produced naturally inside dominant halos, with a mass-radius relation that resembles the predictions of the "cold" dark matter cosmological scenario. The critical condition for global gas loss as a result of the first burst of star formation is that the virial velocity be below a critical value on the order of 100 km s-1. In any hierarchial scenario for galaxy formation, this condition leads to two distinct classes of galaxies as observed: (1) the diffuse dwarfs which mostly originate from typical density perturbations; and (2) the normal, brighter galaxies which can originate only from the highest density peaks. This provides a statistical biasing mechanism for the preferential formation of bright galaxies in denser regions (clusters and superclusters). Publication: The Astrophysical Journal Pub Date: April 1986 DOI: 10.1086/164050 Bibcode: 1986ApJ...303...39D Keywords: Abundance; Cold Plasmas; Dark Matter; Dwarf Galaxies; Galactic Evolution; Stellar Winds; Virgo Galactic Cluster; Big Bang Cosmology; Galactic Structure; Local Group (Astronomy); Mass To Light Ratios; Stellar Evolution; Supernovae; Astrophysics; COSMOLOGY; GALAXIES: CLUSTERING; GALAXIES: FORMATION; GALAXIES: INTERNAL MOTIONS; GALAXIES: STRUCTURE full text sources ADS | data products SIMBAD (10) NED (10)