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Contraction of dark matter galactic halos due to baryonic infall
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1986
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Galaxies contain roughly 10 % baryonic matter that dissipatively sinks by a factor of ~10 during formation, potentially generating large dissipationless cores from kinetic energy, subclustering, tidal effects, or anisotropic collapse. Baryonic infall pulls dark matter inward, producing smaller, denser cores, smooths mass‑distribution discontinuities, and yields flat rotation curves over large distances, matching observations of spiral galaxies. Published in The Astrophysical Journal (Feb 1986), DOI 10.1086/163867.
view Abstract Citations (1117) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Contraction of Dark Matter Galactic Halos Due to Baryonic Infall Blumenthal, G. R. ; Faber, S. M. ; Flores, R. ; Primack, J. R. Abstract Varied evidence suggests that galaxies consist of roughly 10 percent baryonic matter by mass and that baryons sink dissipatively by about a factor of 10 in. radius during galaxy formation. It is shown that such infall strongly perturbs the underlying dark matter distribution, pulling it inward and creating cores that are considerably smaller and denser than would have evolved without dissipation. Any discontinuity between the baryonic and dark matter mass distributions is smoothed out by the coupled motions of the two components. If dark halos have large core radii in the absence of dissipation, the above infall scenario yields rotation curves that are flat over large distances, in agreement with observations of spiral galaxies. Such large dissipationless cores may plausibly result from large internal kinetic energy in protogalaxies at maximum expansion, perhaps as a result of subclustering, tidal effects, or anisotropic collapse. Publication: The Astrophysical Journal Pub Date: February 1986 DOI: 10.1086/163867 Bibcode: 1986ApJ...301...27B Keywords: Baryons; Galactic Evolution; Galactic Rotation; Galactic Structure; Gravitational Collapse; Missing Mass (Astrophysics); Astronomical Models; Halos; Interstellar Matter; Many Body Problem; Mass Distribution; Spiral Galaxies; Astrophysics; GALAXIES: EVOLUTION; GALAXIES: INTERNAL MOTIONS; GALAXIES: STRUCTURE; INTERSTELLAR: MATTER full text sources ADS |