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Specific Angular Momentum Distribution of Disc Galaxies Formed in Preheated Intergalactic Media |
| LUO Zhi-Jian1,2;FU Li-Ping3;SHU Cheng-Gang1,3 |
| 1Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030
2Department of Physics, Jiangxi Normal University, Nanchang 330027
3United Centre for Astrophysics, Shanghai Normal University, Shanghai 200234 |
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| Cite this article: |
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LUO Zhi-Jian, FU Li-Ping, SHU Cheng-Gang 2004 Chin. Phys. Lett. 21 1409-1412 |
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Abstract Assuming that baryons within a galactic halo have the same specific angular momentum as the dark matter where they locate initially and a disc forms due to the gas cooling and condensation with the conservation of angular momentum, we investigate the angular momentum distribution in a resulting galactic disc under the new preheated galaxy formation model suggested by Mo and Mao (Mon. Not. R. Astron. Soc. 333 (2002) 768). Compared with the observational results, it can be concluded that the preheated galaxy formation model can match current observations. This model can be a good approach to solve the problems of both the angular momentum catastrophe and the mismatch of angular-momentum profiles in current disc galaxy formation models.
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98.52.Nr
98.62.Gq
98.62.Ai
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Published: 01 July 2004
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| PACS: |
98.52.Nr
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(Spiral galaxies)
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98.62.Gq
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(Galactic halos)
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98.62.Ai
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(Origin, formation, evolution, age, and star formation)
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