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Theory of Cluster Formation: Effects of Magnetic Fields

  • Fumitaka Nakamura (a1) (a2) and Zhi-Yun Li (a3)

Abstract

Stars form predominantly in clusters inside dense clumps of molecular clouds that are both turbulent and magnetized. The typical size and mass of the cluster-forming clumps are ~1 pc and ~102 – 103 M, respectively. Here, we discuss some recent progress on numerical simulations of clustered star formation in such parsec-scale dense clumps with emphasis on the role of magnetic fields. The simulations have shown that magnetic fields tend to slow down global gravitational collapse and thus star formation, especially in the presence of protostellar outflow feedback. Even a relatively weak magnetic field can retard star formation significantly, because the field is amplified by supersonic turbulence to an equipartition strength. However, in such a case, the distorted field component dominates the uniform one. In contrast, if the field is moderately-strong, the uniform component remains dominant. Such a difference in the magnetic structure is observed in simulated polarization maps of dust thermal emission. Recent polarization measurements show that the field lines in nearby cluster-forming clumps are spatially well-ordered, indicative of a rather strong field. In such strongly-magnetized clumps, star formation should proceed relatively slowly; it continues for at least several global free-fall times of the parent dense clump (tff ~ a few × 105 yr).

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References

Hide All
Carpenter, J. M. 2000, AJ, 120, 3139
Carroll, J. J., Frank, A., & Blackman, E. G. 2010, submitted to ApJ (arXiv:1005.1098)
Falgarone, E., Troland, T. H., Crutcher, R. M., & Paubert, G. 2008, A&A, 487, 247
Lada, C. J. & Lada, E. A. 2003, ARA&A, 41, 57
Gutermuth, et al. 2008, ApJ (Letters), 673, L151
Li, Z.-Y., & Nakamura, F. 2006, ApJ (Letters), 640, L187
Li, Z.-Y., Wang, P., Abel, T., & Nakamura, F. 2010, ApJ (Letters), 720, L26
Maruta, et al. 2010, ApJ, 714, 680
Nakamura, F. & Li, Z.-Y. 2007, ApJ, 662, 395
Nakamura, F. & Li, Z.-Y. 2008, ApJ, 687, 354
Padoan, P., et al. 2001, ApJ, 559, 1005
Price, D. J. & Bate, M. R. 2008, MNRAS, 385, 1820
Price, D. J. & Bate, M. R. 2009, MNRAS, 398, 33
Ridge, N. A., Wilson, T. L., Megeath, S. T., Allen, L. E., & Myers, P. C. 2003, AJ, 126, 286
Saito, H., Saito, M., Yonekura, Y., & Nakamura, F. 2008, ApJS, 178, 302
Sugitani, et al. 2010, ApJ, 716, 299
Troland, T. H. & Crutcher, R. M. 2008, ApJ, 680, 457
Wang, P., Li, Z.-Y., Abel, T., & Nakamura, F. 2010, ApJ, 709, 27
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Theory of Cluster Formation: Effects of Magnetic Fields

  • Fumitaka Nakamura (a1) (a2) and Zhi-Yun Li (a3)

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