Advertisement

Amazing Light pp 485-496 | Cite as

Sgr A* — A Starving Black Hole?

  • Peter G. Mezger
  • Wolfgang J. Duschl
  • Robert Zylka
  • Thomas Beckert

Abstract

The Galactic Center was actually the first radio source identified after Carl Guthe Jansky’s discovery of cosmic radio radiation in 1933. At the long wavelength of λ 14.5 m Jansky nearly exclusively observed only synchrotron emission. Although the contribution of free-free emission becomes stronger at decimeter wavelengths, in later surveys with 25 m telescopes at λ 20 cm [1] and λ 11 cm (Altenhoff et al. [2]), the Sagittarius A (Sgr A) radio complex was still observed as a single compact but predominantly nonthermal radio source, well above the level of the diffuse emission from the Galactic Disk.

Keywords

Black Hole Radio Source Massive Star Galactic Disk Synchrotron Emission 
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. [1]
    G. Westerhout G., Bull. Astron. Inst. Neth., Vol. XIVNr. 488 (1958) p. 215.Google Scholar
  2. [2]
    W. J. Altenhoff, P. G. Mezger, H. Strassl, H. Wender, and W. Westerhout, Veroff. d. Universitats-Sternwarte zu Bonn Nr. 59(1960).Google Scholar
  3. [3]
    D. Downes D. and A. H. M. Martin, Nature 233, 112 (1971).ADSCrossRefGoogle Scholar
  4. [4]
    D. Lynden-Bell and M. J. Rees, MNRAS 152, 461 (1971).ADSGoogle Scholar
  5. [5]
    B. Balick and R. L. Brown, ApJ 194, 265 (1974).ADSCrossRefGoogle Scholar
  6. [6]
    T. Pauls, P. G. Mezger, and E. Churchwell, A&A 34, 327 (1974).ADSGoogle Scholar
  7. [7]
    P. G. Mezger and T. Pauls, IAU Symp. No. 84 (W.B. Burton, ed.), (1979) p. 357.Google Scholar
  8. [8]
    E. R. Wollman, T. R. Geballe, J. H. Lacy, C. H. Townes, and D. M. Rank, ApJ 218, L103 (1977).ADSCrossRefGoogle Scholar
  9. [9]
    E. R. Wollman, IAU Symp. No. 84, W. B. Burton, ed., (1979) p. 367.Google Scholar
  10. [10]
    P. G. Mezger and J. E. Wink, A&A 157, 252 (1986).ADSGoogle Scholar
  11. [11]
    T. Beckert, W. J. Duschl, P. G. Mezger, and R. Zylka, A&A (1995) submitted.Google Scholar
  12. [12]
    R. Genzel, D. Hollenbach, C. H. Townes, 1994, The Nucleus of our Galaxy, Rep. Prog. Phys. 57, 417 (1994).Google Scholar
  13. [13]
    R. Genzel, A. I. Harris (eds.), The Nuclei of Normal Galaxies - Lessons from the Galactic Center, NATO-ASI Series Vol. 445(1994).Google Scholar
  14. [14]
    P. G. Mezger, W. J. Duschl, and R. Zylka, in preparation.Google Scholar
  15. [15]
    Y. M. Georgelin and Y. P. Georgelin, A&A 49, 57 (1976).ADSGoogle Scholar
  16. [15]
    Y. M. Georgelin and Y. P. Georgelin, A&A 49, 57 (1976).ADSGoogle Scholar
  17. [15]
    Y. M. Georgelin and Y. P. Georgelin, A&A 49, 57 (1976).ADSGoogle Scholar
  18. [18]
    P. Cox and P. G. Mezger, A&A Rev. 1, 49(1989).Google Scholar
  19. [19]
    P. G. Mezger, R. Zylka, C. J. Salter, et al., A&A 209, 337 (1989).ADSGoogle Scholar
  20. [20]
    R. Gusten, R. Genzel, and M. C. H. Wright, et al., ApJ 318124 (1987).ADSCrossRefGoogle Scholar
  21. [21]
    W. J. Duschl, MNRAS 240, 219 (1989).ADSGoogle Scholar
  22. [22]
    I. Yi, G. B. Field, and E. G. Blackman, ApJ 432, L31 (1994).ADSCrossRefGoogle Scholar
  23. [29]
    I. Gatley, R. Joyce, A. Fowler, D. DePoy, and R. Probst, IAU Symposium No. 136, M. Morris, ed. (1989) p. 361.Google Scholar
  24. [24]
    R. Genzel, IAU Symp. No. 136, M. Morris, ed. (1989) p. 393.Google Scholar
  25. [25]
    D. Y. Gezari, in: The Center, Bulge and Disk of the Milky WayL. Blitz, ed., ( Kluwer, Dordrecht, 1992 ). p. 23.Google Scholar
  26. [25]
    D. Y. Gezari, in: The Center, Bulge and Disk of the Milky WayL. Blitz, ed., ( Kluwer, Dordrecht, 1992 ). p. 23.Google Scholar
  27. [27]
    A. Krabbe, R. Genzel, S. Drapatz, and V. Rotaciuc, ApJ 382, L19 (1991).ADSCrossRefGoogle Scholar
  28. [27]
    A. Krabbe, R. Genzel, S. Drapatz, and V. Rotaciuc, ApJ 382, L19 (1991).ADSCrossRefGoogle Scholar
  29. [29]
    J. M. Jackson, N. Geis, R. Genzel, et al., ApJ 402, 173 (1993).ADSCrossRefGoogle Scholar
  30. [30]
    R. D. Davies, D. Walsh D., and R. S. Booth, MNRAS 177, 319 (1976).ADSGoogle Scholar
  31. [31]
    J.-H. Zhao, W. M. Goss, K. -Y. Lo, and R. D. Ekers, in: Relationship between Active Nuclei and Starburst Galaxies A. Filippenko, ed., (1991) p. 295.Google Scholar
  32. [32]
    A. Greve, et al., A&A (1995) in press.Google Scholar
  33. [33]
    M. Grewing, IRAM Newsletter 19, 1 (1995).Google Scholar
  34. [34]
    T. P. Krichbaum, C. J. Schalinski, A. Witzel, et al, in: The Nuclei of Normal Galaxies - Lessons from the Galactic Center NATO-ASI Series Vol. 445, (1994) p. 411.Google Scholar
  35. [35]
    T. P. Krichbaum, J. A. Zensus, A. Witzel, et al, A&A 274, L37 (1993).ADSGoogle Scholar
  36. [36]
    A. E. E. Rogers, S. Doeleman, M. C. H. Wright, et al, ApJ 434, L59 (1994).ADSCrossRefGoogle Scholar
  37. [37]
    A. Eckart, R. Genzel, A. Krabbe, et al, Nature 355, 526 (1992).ADSCrossRefGoogle Scholar
  38. [38]
    R. Zylka, P. G. Mezger, and H. Lesch, A&A 261, 119 (1992).ADSGoogle Scholar
  39. [39]
    P. Predehl and J. Triimper, A&A 290, L29 (1994).ADSGoogle Scholar
  40. [40]
    P. Predehl and Y. Tanaka, private communication.Google Scholar
  41. [41]
    W. J. Duschl and H. Lesch, A&A 286, 431 (1994).ADSGoogle Scholar
  42. [42]
    T. Beckert, Diploma thesis, University of Heidelberg, Germany (1995).Google Scholar

Copyright information

© Springer-Verlag New York, Inc. 1996

Authors and Affiliations

  • Peter G. Mezger
  • Wolfgang J. Duschl
  • Robert Zylka
  • Thomas Beckert

There are no affiliations available

Personalised recommendations