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- W2023355838 abstract "view Abstract Citations (9) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radiation Pressure in Intergalactic Clouds Braun, Erez ; Dekel, Avishai Abstract We calculate the radiation pressure by trapped Lyα photons in a uniform medium photoionized by external UV flux. We consider the vicinity of quasars and the effect of a background flux, and address small protogalactic clouds and intervening absorption clouds. For a quasi-static gravitating cloud at ~10^4^ K, necessary conditions for the radiation pressure to halt the contraction of the whole cloud are that the cloud size is <= 100 kpc and the gas density is >= 4 x 10^-2^ cm^3. Hence, the radiation pressure is unimportant in gravitating clouds if they grow hierarchically from the cosmological background and turn around after z ~ 5, as in the cold dark matter picture. The radiation pressure can halt the contraction of ~ 10^8^ M_sun_ clouds, but only if they fragment from a denser background, as in pancake scenarios, where it provides a useful local antibiasing mechanism. In clouds which are confined by external pressure and photoionized by the background UV flux, the radiation pressure dominates if the H I column density is larger than ~10^17^ cm^-2^, Clouds of lower column density can be stable and avoid forming stars, while stable clouds of higher column density could not be pressure confined--they would expand under the radiation pressure. The observed absorption clouds with N_HI_ > 10^17^ cm^-2^ must therefore be confined by gravity, and radiation pressure could not prevent them from collapsing and forming stars. This provides a possible explanation for the critical H I column density which is claimed observationally to distinguish between the metal-poor Lyα clouds and the metal-rich clouds. Publication: The Astrophysical Journal Pub Date: October 1989 DOI: 10.1086/167878 Bibcode: 1989ApJ...345...31B Keywords: Computational Astrophysics; Galactic Evolution; Intergalactic Media; Quasars; Radiation Pressure; Abundance; Background Radiation; Gravitational Effects; Lyman Alpha Radiation; Photoionization; Ultraviolet Radiation; Astrophysics; COSMOLOGY; GALAXIES: FORMATION; GALAXIES: INTERGALACTIC MEDIUM; QUASARS full text sources ADS |" @default.
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- W2023355838 date "1989-10-01" @default.
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- W2023355838 title "Radiation pressure in intergalactic clouds" @default.
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