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Identification of faint radio sources with optically luminous interacting disk galaxies

Nature volume 375, pages 471–474 (1995)Cite this article

Abstract

THE question of when galaxies and stars started to form in the early Universe is one of the most fundamental in cosmology. Faint radio sources (with fluxes of a few microjanskys or less) may be these early galaxies; radio surveys have shown them to be increasingly common as fainter levels are reached1-7, suggesting that they are an important constituent of the early Universe. Many of these sources were identified with faint blue galaxies—some of which have peculiar morphology (perhaps arising from inter actions) 1,8-10 or with galaxies hosting enhanced star formation activity10-12, but lack of optical resolution has made the nature of these identifications rather uncertain. Here we present the results of a very deep radio survey, obtained with the Very Large Array, of a field imaged with the Wide Field Camera on the Hubble Space Telescope. We find that most of the microjansky sources are indeed faint blue galaxies, with light profiles resembling disk galaxies. More than half of these galaxies occur in pairs or small groups, compared to fewer than ten per cent of nearby galaxies. We conclude that the microjansky sources are luminous disk galaxies, in a starburst (or post-starburst) phase that was triggered by interactions or mergers. Only a few show evidence for an active nucleus2,13,14, which is the other possible power source for the emission.

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References

  1. Windhorst, R. A., Miley, G. K., Owen, F. N., Kron, R. G. & Koo, D. C. Astrophys. J. 289, 494–513 (1985).

    Article  ADS  Google Scholar 

  2. Windhorst, R. A., Fomalont, E. B., Partridge, R. B. & Lowenthal, J. D. Astrophys. J. 405, 489–517 (1993).

    Article  ADS  Google Scholar 

  3. Condon, J. J. Astrophys. J. 338, 13–23 (1989).

    Article  ADS  Google Scholar 

  4. Kellermann, K. I. & Wall, J. V. in Observational Cosmology (eds Hewitt, A., Burbidge, G. & Fang, L. Z.) 545–564 (IAU Symp. 124, Reidel, Dordrecht, 1987).

    Book  Google Scholar 

  5. Fomalont, E. B., Windhorst, R. A., Kristian, J. A. & Kellermann, K. I. Astr. J. 102, 1258–1277 (1991).

    Article  ADS  Google Scholar 

  6. Fomalont, E. B., Partridge, R. B., Lowenthal, J. D. & Windhorst, R. A. Astrophys. J. 404, 8–20 (1993).

    Article  ADS  CAS  Google Scholar 

  7. Condon, J. J. Astrophys. J. 287, 461–174 (1984).

    Article  ADS  Google Scholar 

  8. Kron, R. G., Koo, D. C. & Windhorst, R. A. Astr. Astrophys. 146, 38–58 (1985).

    ADS  Google Scholar 

  9. Weistrop, D., Wall, J. V., Fomalont, E. B. & Kellermann, K. I. Astr. J. 93, 805–810 (1987).

    Article  ADS  CAS  Google Scholar 

  10. Windhorst, R. A., Dressier, A. & Koo, D. C. in Observational Cosmology (eds Hewitt, A., Burbidge, G. & Fang, L. Z.) 573–576 (IAU Symp. 124, Reidel, Dordrecht, 1987).

    Book  Google Scholar 

  11. Benn, C. R., Rowan-Robinson, M., McMahon, R. G., Broadhurst, T. J. & Lawrence, A. Mon. Not. R. astr. Soc. 263, 98–122 (1993).

    Article  ADS  CAS  Google Scholar 

  12. Thuan, T. X. & Condon, J. J. Astrophys. J. 322, L9–L14 (1987).

    Article  ADS  Google Scholar 

  13. Oort, M. J. A. & Windhorst, R. A. Astr. Astrophys. 145, 405–424 (1985).

    ADS  Google Scholar 

  14. Donnelly, R. H., Partridge, R. B. & Windhorst, R. A. Astrophys. J. 321, 94–112 (1987).

    Article  ADS  CAS  Google Scholar 

  15. Windhorst, R. A. et al. Astr. J. 107, 930–945 (1994).

    Article  ADS  Google Scholar 

  16. Griffiths, R. E. et al. Astrophys. J. 437, 67–82 (1994).

    Article  ADS  Google Scholar 

  17. Windhorst, R. A., Mathis, D. F. & Keel, W. C. Astrophys. J. 400, L1–L4 (1992).

    Article  ADS  Google Scholar 

  18. Windhorst, R. A. et al. Astrophys. J. 435, 577–598 (1994).

    Article  ADS  Google Scholar 

  19. Keel, W. C. & Windhorst, R. A. Astr. J. 106, 455–465 (1993).

    Article  ADS  Google Scholar 

  20. Casertano, S. et al. Astrophys. J. (submitted).

  21. Ratnatunga, K. U., Griffiths, R. E., Casertano, S., Neuschaefer, L. W. & Wyckoff, E. W. Astr. J. 108, 2362–2372 (1994).

    Article  ADS  Google Scholar 

  22. Condon, J. J. A. Rev. Astr. Astrophys. 30, 575–612 (1992).

    Article  ADS  Google Scholar 

  23. Windhorst, R. A., Kron, R. G. & Koo, D. C. Astr. Astrophys. Suppl. Ser. 58, 39–87 (1984).

    ADS  Google Scholar 

  24. Mitchell, K. et al. Publ. astr. Soc. Pacif. 93, 647–654 (1981).

    Article  ADS  Google Scholar 

  25. Ostriker, J. P. & Heisler, J. Astrophys. J. 278, 1–10 (1984).

    Article  ADS  Google Scholar 

  26. Burkey, J. M., Keel, W. C., Windhorst, R. A. & Franklin, B. E. Astrophys. J. 429, L013–L017 (1994).

    Article  ADS  Google Scholar 

  27. Griffiths, R. E. et al. Astrophys. J. 435, L019–L022 (1994).

    Article  ADS  Google Scholar 

  28. Windhorst, R. A., Mathis, D. F. & Neuschaefer, L. W. in Evolution of the Universe of Galaxies (ed. Kron, R. G.) 389–403 (ASP Conf. Ser. Vol. 10, Bookcrafters, Provo, UT, 1990).

    Google Scholar 

  29. Dressler, A. & Gunn, J. E. Astrophys. J. 270, 7–19 (1983).

    Article  ADS  CAS  Google Scholar 

  30. Patnaik, A. R., Browne, I. W. A., Wilkinson, P. N. & Wrobel, J. M. Mon. Not. R. astr. Soc. 254, 655–676 (1992).

    Article  ADS  Google Scholar 

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Authors and Affiliations

  1. Department of Physics and Astronomy, Arizona State University, Tempe, Arizona, 85287-1504, USA

    R. A. Windhorst, B. E. Franklin & S. M. Pascarelle

  2. National Radio Astronomy Observatory, Edgemont Road, Charlottesville, Virginia, 22903-2475, USA

    E. B. Fomalont & K. I. Kellermann

  3. Haverford College, Department of Astronomy, Haverford, Pennsylvania, 19041, USA

    R. B. Partridge & E. Richards

  4. Bloomberg Center for Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland, 21218-2695, USA

    R. E. Griffiths

Authors
  1. R. A. Windhorst
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  2. E. B. Fomalont
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  8. R. E. Griffiths
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Windhorst, R., Fomalont, E., Kellermann, K. et al. Identification of faint radio sources with optically luminous interacting disk galaxies. Nature 375, 471–474 (1995). https://doi.org/10.1038/375471a0

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