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Hydrodynamic Simulations of Galaxy Formation. II. Photoionization and the Formation of Low-Mass Galaxies
Open accessAbstract
Photoionization by the high-redshift ultraviolet radiation background heats low- density gas before it falls into dark matter potential wells, and it eliminates the neutral hydrogen and singly ionized helium that dominate cooling of primordial gas at temperatures of 10^4^-10^5^ K. We investigate the influence of photoionization on galaxy formation using high-resolution simulations with a one-dimensional, spherically symmetric, Lagrangian hydrodynamics/gravity code. We find that the presence of a photoionizing background suppresses the formation of galaxies with circular velocities v_circ_ <~ 30 km s^-1^ and substantially reduces the mass of cooled baryons in systems with circular velocities up to v_circ_ ~ 50 km s^-1^. Above v_circ_ ~ 75 km s^-1^, photoionization has no significant effect. Photoionization exerts its influence primarily by heating gas before collapse; the elimination of line cooling processes is less important. We discuss the implications of these results for hierarchical theories of galaxy formation.
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Cited by
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Klypin, A., Kravtsov, A. V., Valenzuela, O., & Prada, F. (1999) · The Astrophysical Journal · doi:10.1086/307643 · Cited by 2,741
The New Galaxy: Signatures of Its Formation
Freeman, K., & Bland-Hawthorn, J. (2002) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.40.060401.093840 · Cited by 1,160
Dark matter self-interactions and small scale structure
Tulin, S., & Yu, H.-B. (2018) · Physics Reports · doi:10.1016/j.physrep.2017.11.004 · Cited by 1,111
Tracing Galaxy Formation with Stellar Halos. I. Methods
Bullock, J. S., & Johnston, K. V. (2005) · The Astrophysical Journal · doi:10.1086/497422 · Cited by 1,044
A NEW CALCULATION OF THE IONIZING BACKGROUND SPECTRUM AND THE EFFECTS OF He II REIONIZATION
Faucher-Giguère, C.-A., Lidz, A., Zaldarriaga, M., & Hernquist, L. (2009) · The Astrophysical Journal · doi:10.1088/0004-637x/703/2/1416 · Cited by 699
Metadata
- Authors
- Thoul, A. A., & Weinberg, D. H.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1996-07
- Volume
- 465
- Pages
- 608
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2046076359
- Cited by
- 457
- References
- 0
- FWCI
- 11.24
- Type
- journal article
- Language
- en
- Open access
- green
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- Thoul, A. A., & Weinberg, D. H. (1996). Hydrodynamic Simulations of Galaxy Formation. II. Photoionization and the Formation of Low-Mass Galaxies. The Astrophysical Journal. https://doi.org/10.1086/177446
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