VLBI imaging with an angular resolution of 100 microarcseconds

Article metrics

Abstract

The investigation of the nuclei of galaxies and quasars has been central to modern astronomy. The application of the technique of very-long-baseline interferometry (VLBI) to such sources has allowed the mapping of their angular radio brightness distributions and the analysing of their temporal changes. Many radio galaxies and quasars consist of a compact core, or centre of activity, and collimated jets of material ejected from the core with relativistic velocities1. Of particular interest are the brightness distributions and kinematics of the cores of such sources, because they may contain a supermassive object (SMO), possibly a black hole2 (but see ref. 3 for an alternative view), with a mass of 109 M (ref. 4) and a Schwarzschild radius of 3 x l014cm. We present here global VLBI observations of 11 radio sources at a wavelength of 7 mm, including a map of the brightness distribution of the active galactic nucleus in 3C84. This map has an angular resolution of 100 microarcseconds, unsurpassed in an image of a celestial object.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1

    Zensus, J. A. & Pearson, T. J. IAU Symp. No. 129 (eds Reid, M. J. & Moran, J. M.) 7–16 (Reidel, Dordrecht, 1988).

  2. 2

    Rees, M. J. A. Rev. Astr. Astrophys. 22, 471–506 (1984).

  3. 3

    Kundt, W. Astrophys. Space Sci. 62, 335–345 (1979).

  4. 4

    Begelman, M. C., Blandford, R. D. & Rees, M. J. Rev. mod. Phys. 56, 255–351 (1984).

  5. 5

    Camenzind, M. Astr. Astrophys. 156, 137–151 (1986).

  6. 6

    Jones, T. W., O'Dell, S. L. & Stein, W. A. Astrophys. J. 188, 353–368 (1974).

  7. 7

    Kühr, H., Liebert, J. V., Strittmatter, P. A., Schmidt, G. D. & Mackay, C. Astrophys. J. 275, L33–L37 (1983).

  8. 8

    Bartel, N., Herring, T. A., Ratner, M. I., Shapiro, I. I. & Corey, B. E. Nature 319, 733–738 (1986).

  9. 9

    Bartel, N. et al. Astrophys. J. 262, 556–563 (1982).

  10. 10

    Bartel, N. et al. Astrophys. J. 323, 505–515 (1987).

  11. 11

    Levy, G. S. et al. Science 234, 187–189 (1986).

  12. 12

    Kardashev, N. S. & Slysh, V. I. IAU Symp. No. 129 (eds Reid, M. J. & Moran, J. M.) 433–440 (Reidel, Dordrecht, 1988).

  13. 13

    Schilizzi, R. T. IAU Symp. No. 129 (eds Reid, M. J. & Moran, J. M.) 441–446 (Reidel, Dordrecht, 1988).

  14. 14

    Hirabayashi, H. IAU Symp. No. 129 (eds Reid, M. J. & Moran, J. M.) 449–456 (Reidel, Dordrecht, 1988).

  15. 15

    Readhead, A. C. S. et al. Nature 303, 504–506 (1983).

  16. 16

    Backer, D. C. et al. Astrophys. J. 322, 74–79 (1987).

  17. 17

    Rogers, A. E. E. et al. Science 219, 51–54 (1983).

  18. 18

    Dhawan, V. et al. Bull. Am. astr. Soc. 18, 41.06 (1986).

  19. 19

    Marcaide, J. M. et al. in Proc. ESO Workshop on (Sub)Millimeter Astronomy (eds Shaver, P. A. & Kjär, K.) 157–167 (1985).

  20. 20

    Dhawan, V. thesis, Massachusetts Inst. Technol. (1987).

  21. 21

    Lynds, R. Astrophys. J. Lett. 159, L151–L154 (1970).

  22. 22

    Rothschild, R. E., Baity, W. A., Marscher, A. P. & Wheaton, W. A. Astrophys. J. Lett. 243, L9–L12 (1981).

  23. 23

    Kingham, K. A. & O'Connell, R. W. Astr. J. 84, 1537–1541 (1979).

  24. 24

    Lebofsky, M. J. & Rieke, G. H. Nature 284, 410–412 (1980).

  25. 25

    Epstein, E. E., Fogarty, W. G., Mottmann, J. & Schneider, E. Astrophys. J. 87, 449–461 (1982).

  26. 26

    O'Dea, C. P., Dent, W. A. & Balonek, T. J. Astrophys. J. 278, 89–95 (1984).

  27. 27

    Noordam, J. E. & de Bruyn, A. G. Nature 299, 597–600 (1982).

  28. 28

    Pedlar, A., Booler, R. V. & Davis, R. D. Mon. Not. R. astr. Soc. 203, 667–675 (1983).

  29. 29

    Romney, J. D., Alef, W., Pauliny-Toth, I. I. K. & Preuss, E. IAU Symp. No. 97 (eds Heeschen, D. S. & Wade, C. M.) 291–292 (Reidel, Dordrecht, 1982).

  30. 30

    Readhead, A. C. S., Hough, D. H., Ewing, M. S., Walker, R. C. & Romney, J. D. Astrophys. J. 265, 107–131 (1983).

  31. 31

    Marr, J. M., Backer, D. C., Wright, M. C. H., Readhead, A. C. S. & Moore, R. IAU Symp. No. 129 (eds Reid, M. J. & Moran, J. M.) 91–92 (Reidel, Dordrecht, 1988).

  32. 32

    Lawrence, C. R. et al. Astrophys. J. 296, 458–460 (1985).

  33. 33

    Johansson, J. M., Elgered, G. & Rönnäng, B. O. IAU Symp. No. 129 (eds Reid, M. J. & Moran, J. M.) 547–548 (Reidel, Dordrecht, 1988).

  34. 34

    Kellermann, K. I. & Thompson, A. R. Science 229, 123–130 (1985).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.