Advertisement

The Milky Way’s Black Hole and the Central Stellar Cluster: Variable Emission from SgrA

  • A. Eckart
  • R. Schödel
  • C. Straubmeier
  • T. Viehmann
  • J.-U. Pott
  • N. Mouawad
Conference paper

Abstract

The dark mass located at the center of the Milky Way is currently the very best candidate for a super massive black hole in our immediate vicinity. The strongest evidence for this is provided by measurements of stellar orbits and strongly variable NIR and X-ray emission from Sagittarius A* at the center of the cental stellar cluster. As proven by the Keplerian orbits of several of the high velocity stars within the central arcsecond the Galactic Center harbors a ∼ 3.5 × 106M massive black hole at the position of the compact radio source SgrA*. Simultaneous NIR/Xray observations of SgrA* in 2003/2004 have revealed first insights into the emission mechanisms of both the powerful near-infrared flares and the “quiescent” emission from within a few ten to one hundred Schwarzschild radii of the super-massive black hole at the center of the Milky Way. The central source shows synchronous NIR/X-ray flare variation and indications of quasi-periodicity within the NIR flares.

Keywords

Black Hole Dark Particle Matter Asymptotic Giant Branch Stellar Cluster Asymptotic Giant Branch Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Aschenbach, B., Grosso, N., Porquet, D., Predehl, P., 2004 A&A 417, 71.CrossRefADSGoogle Scholar
  2. Aschenbach, B., 2004, A&A 425, 1075.CrossRefADSGoogle Scholar
  3. Baganoff, F. K. et al., 2001, Nature, 413, 45.CrossRefADSGoogle Scholar
  4. Baganoff, F. K. et al., 2003, HEAD, 35.Google Scholar
  5. Ball, G. H., Narayan, R. & Quataert, E. 2001, ApJ 552, 221.CrossRefADSGoogle Scholar
  6. Blandford, R., & Begelman, M., 1999, MNRAS, 303, L1.CrossRefADSGoogle Scholar
  7. Clénet et al., 2001, A&A 376, 124.CrossRefADSGoogle Scholar
  8. Colpi, M., Shapiro, S.L., Wassermann, I., 1986, Phys. Rev. Let. 57, 2485CrossRefADSGoogle Scholar
  9. Eckart, A., et al., Proc. Galactic Center Workshop 2002b, Nov. 3–8, 2002, Kailua-Kona, Hawaii, Astron. Nachr., Vol. 324, 557.CrossRefGoogle Scholar
  10. Eckart, A., Moultaka, N., Viehmann, T., et al., 2003, Astron. Nachrichten Suppl. 324, 557CrossRefADSGoogle Scholar
  11. Eckart, A., Baganoff, F.K., Morris, M., et al., 2004, A&A 427, 1 (astroph/0403577).CrossRefADSGoogle Scholar
  12. Eckart et al., 2004, ApJ 602, 760.CrossRefADSGoogle Scholar
  13. Eyres et al., 2004, MNRAS 350, L9.CrossRefADSGoogle Scholar
  14. Genzel, R., Eckart, A., Ott, Th., Eisenhauer, F., 1997, MNRAS, 291, 219.ADSGoogle Scholar
  15. Genzel, R., Schödel, R., Ott, T., et al., 2003a, Nature 425, 934CrossRefADSGoogle Scholar
  16. Genzel, R., Schödel, R., Ott, T., et al., 2003b, ApJ 594, 812CrossRefADSGoogle Scholar
  17. Geballe et al., 1989, A&A 208, 255.ADSGoogle Scholar
  18. Ghez, A. M., Duchene, G., Matthews, K. et al., 2003a, Astrophys.J., 586, L127.CrossRefADSGoogle Scholar
  19. Ghez, A. M. et al., 2003b, 2003b, ANS 324, 527ADSGoogle Scholar
  20. Ghez, A. M. et al., 2004, ApJ 601, L159CrossRefADSGoogle Scholar
  21. Goldwurm, A. et al., 2003, ApJ 584, 751.CrossRefADSGoogle Scholar
  22. Horrobin et al., 2004, AN 325, 88.ADSGoogle Scholar
  23. Kaup, D. J., 1968, Phys. Rev. 172, 1331.CrossRefADSGoogle Scholar
  24. Krabbe et al., 1995, ApJ 447, L95.ADSCrossRefGoogle Scholar
  25. Leinert, C., & Graser, U., 1998, in Proc. SPIE Vol. 3350, p. 389–393, Astronomical Interferometry, Robert D. Reasenberg; Ed.Google Scholar
  26. Maoz, E., 1998, ApJ 447, L91.ADSGoogle Scholar
  27. Markoff, S., Falcke, H., Yuan, F. & Biermann, P.L., 2001, Astr.Ap. 379, L13.ADSCrossRefGoogle Scholar
  28. Melia, F. & Falcke, H. 2001, ARAA 39, 309.ADSCrossRefGoogle Scholar
  29. Mielke, E., & Schunck, F., 2000, Nucl. Phys. B, 594, 1985Google Scholar
  30. Moneti et al., 2001, ApJ 549, L203.CrossRefADSGoogle Scholar
  31. Mouawad, N, Eckart, A., Pfalzner, S., et al., 2003a, LNP Vol. 626: Galaxies and Chaos, 302.ADSGoogle Scholar
  32. Mouawad, N, Eckart, A., Pfalzner, S., et al., 2003b, Astron. Nachrichten Supplement, 324, 315.CrossRefADSGoogle Scholar
  33. Mouawad, N, Eckart, A., Pfalzner, S., et al., 2004, Astron. Nachrichten submitted.Google Scholar
  34. Moultaka, J., Eckart, A., Viehmann, T., Mouawad, N., Straubmeier, C., Ott, T., Schödel, R., 2004 A&A 425, 529CrossRefADSGoogle Scholar
  35. Najarro et al., 1997, A&A 325, 700.ADSGoogle Scholar
  36. Narayan, R., Yi, I., & Mahadevan, R., 1995, Nature, 374, 623.CrossRefADSGoogle Scholar
  37. Ott et al., 1999, ApJ 523, 248.CrossRefADSGoogle Scholar
  38. Porquet, D., Predehl, P., Aschenbach, B., et al., 2003, A&A 407, L17CrossRefADSGoogle Scholar
  39. Rigaut et al., 2003, ANS 324, 551.ADSGoogle Scholar
  40. Ruffini, R., &, Bonazzola, S., 1969, Phys. Rev. 187, 1767CrossRefADSGoogle Scholar
  41. Sandford et al., 1988, ApJ, 329, 498.CrossRefADSGoogle Scholar
  42. Scally & Clarke 2001, MNRAS 325, 449.CrossRefADSGoogle Scholar
  43. Tanner et al., 2003, ANS 324, 597.ADSGoogle Scholar
  44. Tanner et al., 2002, ApJ 575, 860.CrossRefADSGoogle Scholar
  45. Tielens et al., 1991, ApJ 381, 181.CrossRefADSGoogle Scholar
  46. Torres, D. F., Capoziello, S., Lambiase, G., 2000, Phys. Rev. D 62, 104012CrossRefADSGoogle Scholar
  47. Viemann, T., Eckart, A., Schödel, R., Moultaka, J., Straubmeier, C., L-and M-band Imaging Observations of the Galactic Center Region, 2005, A&A in pressGoogle Scholar
  48. Viollier, R. D., Leimbruber, F. R., and Trautmann, D., 1992, Physics Letters B, 297, 132CrossRefADSGoogle Scholar
  49. Yuan, F., Markoff, S. & Falcke, H. 2002, Astron. Astrophys. 854, 854.CrossRefADSGoogle Scholar
  50. Yuan, F., Quataert, E. & Narayan, R., 2004, Ap.J. 606, 894.CrossRefADSGoogle Scholar
  51. Yuan, F., Quataert, E. & Narayan, R. 2003, Ap.J. 598, 301.CrossRefADSGoogle Scholar
  52. Zhao, J.-H., et al., 2003, Ap.J. 586 L29.CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • A. Eckart
    • 1
  • R. Schödel
    • 1
  • C. Straubmeier
    • 1
  • T. Viehmann
    • 1
  • J.-U. Pott
    • 1
    • 2
  • N. Mouawad
    • 1
  1. 1.I. Physikalisches InstitutUniversity of CologneKölnGermany
  2. 2.European Southern Observatory, ESO Headquarter GarchingGarchingGermany

Personalised recommendations