Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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TURBULENCE PRODUCED BY TSUNAMIS IN GALAXY CLUSTERS

  • Published : 2004.12.01
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Abstract

Clusters of galaxies are filled with X-ray emitted hot gas with the temperature of T ${\~}$2-10 keV. Recent X-ray observations have been revealing unexpectedly that many cluster cores have complicated, peculiar X-ray structures, which imply dynamical motion of the hot gas. Moreover, X-ray spectra indicate that radiative cooling of the cool gas is suppressed by unknown heating mechanisms (the 'cooling flow problem'). Here we propose a novel mechanism reproducing both the inhomogeneous structures and dynamics of the hot gas in the cluster cores, based on state-of-the-art hydrodynamic simulations. We showed that acoustic-gravity waves, which are naturally expected during the process of hierarchical structure formation of the universe, surge in the X-ray hot gas, causing a serous impact on the core. This reminds us of tsunamis on the ocean surging into an distant island. We found that the waves create fully-developed, stable turbulence, which reproduces the complicated structures in the core. Moreover, if the wave amplitude is large enough, they can suppress the cooling of the core. The turbulence could be detected in near-future space X-ray missions such as ASTRO-E2.

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References

  1. Blanton, E. L., Sarazin, C. L., McNamara, B. R., & Wise, M. W. 2001, ApJ, 558, L15 https://doi.org/10.1086/323269
  2. Borgani, S., & Guzzo, L. 2001, Nature, 409, 39 https://doi.org/10.1038/35051000
  3. Cho, J., et al. 2003, ApJ, 589, L77 https://doi.org/10.1086/376492
  4. Churazov, E., Briiggen, M., Kaiser, C. R, Bohringer, H., & Forman, W. 2001, ApJ, 554, 261 https://doi.org/10.1086/321357
  5. Churazov, E., Forman, W., Jones, C., & Bohringer, H. 2003, ApJ, 590, 225 https://doi.org/10.1086/374923
  6. Fabian, A. C., et al. 2000, MNRAS, 318, L65 https://doi.org/10.1046/j.1365-8711.2000.03904.x
  7. Fabian, A. C., et al. 2001, MNRAS, 321, L33 https://doi.org/10.1046/j.1365-8711.2001.04243.x
  8. Fujita, Y., et al. 2004a, ApJ, in press (astro-phj0407596)
  9. Fujita, Y, Matsumoto, T., & Wada, K 2004b, ApJ, 612, L9 https://doi.org/10.1086/424483
  10. Fujita, Y., Suzuki, T. K., & Wada, K. 2004c, ApJ, 600, 650 https://doi.org/10.1086/380113
  11. Furusho, T., Yamasaki, N. Y., & Ohashi, T. 2003, ApJ, 596, 181 https://doi.org/10.1086/377532
  12. Gomez, P. L., Loken, C., Roettiger, K., & Burns, J. O. 2002, ApJ, 569, 122 https://doi.org/10.1086/339280
  13. Inogamov, N. A., & Sunyaev, R A. 2003, Astronomy Letters, 29, 791 https://doi.org/10.1134/1.1631412
  14. Kim, W., & Narayan, R. 2003, ApJ, 596, L139 https://doi.org/10.1086/379342
  15. Loewenstein, M., & Fabian, A. C. 1990, ApJ, 242, 120
  16. Markevitch, M., Vikhlinin, A., & Mazzotta, P. 2001, ApJ, 562, L153 https://doi.org/10.1086/337973
  17. Matsumoto, T., & Hanawa, T. 2003, ApJ, 595, 913 https://doi.org/10.1086/377367
  18. Mazzotta, P., Edge, A. C., & Markevitch, M. 2003, ApJ, 596, 190 https://doi.org/10.1086/377633
  19. Moore, B., et al., 1999, ApJ, 524, 1999
  20. Motl, P. M., Burns, J. O., Loken, C. L., Norman, M. L., & Bryan, G. 2004, 606, 635
  21. Nagai, D., Kravtsov, A. V., & Kosowsky, A. 2003, ApJ, 587, 524 https://doi.org/10.1086/368281
  22. McNamara, B. R., et al. 2000, ApJ, 534, L135 https://doi.org/10.1086/312662
  23. Pringle, J. E. 1989, MNRAS, 239, 479 https://doi.org/10.1093/mnras/239.2.479
  24. Ricker, P. M., & Sarazin, C. L. 2001, ApJ, 561, 621 https://doi.org/10.1086/323365
  25. Roettiger, K., Stone, J. M., & Burns, J. O. 1999, ApJ, 518, 594 https://doi.org/10.1086/307298
  26. Sanders, J. S., & Fabian, A. C. 2002, MNRAS, 331, 273 https://doi.org/10.1046/j.1365-8711.2002.05211.x
  27. Voigt, L. M., & Fabian, A. C. 2004, MNRAS, 347, 1130 https://doi.org/10.1111/j.1365-2966.2004.07285.x

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