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Radio Source Surveys

Published online by Cambridge University Press:  26 May 2016

J. J. Condon
J. J. Condon*
Affiliation:
National Radio Astronomy Observatory1, 520 Edgemont Road, Charlottesville, VA 22903 USA

Abstract

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The primary goal of radio source surveys is to generate flux-limited samples. Sources selected at very low frequencies are dominated by unbeamed emission and give the only unbiased view of the parent populations used by “unification” models to account for the diversity of sources seen at high frequencies. Low-frequency surveys favor sources with exceptionally steep spectra. They include radio galaxies at high redshifts, radio halos of nearby galaxies, relic radio sources, diffuse cluster emission, pulsars that may be missed by traditional pulse searches, and a new class of unidentified compact sources. Flux densities from low-frequency surveys extend the spectra of known source populations to frequencies at which free-free and synchrotron absorption become significant and constrain basic source parameters. Finally, telescope fields-of-view scale ∝ λ2, so gridded surveys can be more efficient than directed observations of individual targets. This review covers recent and proposed low-frequency source surveys and their astronomical uses.

Type
Part 1: Radio Source Surveys and Cosmology
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 3 - 10
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Bagchi, J., Pislar, V., & Lima Neto, G. B. 1998, MNRAS, 296, L23 Google Scholar
Baldwin, J. E. 1990, in Low Frequency Astrophysics from Space, ed. Kassim, N. E. & Weiler, K. W. (Springer Verlag Lecture Notes in Physics 362), 195 CrossRefGoogle Scholar
Baldwin, J. E., & Scott, P. F. 1973, MNRAS, 165, 259 Google Scholar
Bietenholz, M. F., Kassim, N., Frail, D. A., Perley, R. A., Erickson, W. C., & Hajian, A. R. 1997, ApJ, 490, 291 CrossRefGoogle Scholar
Blumenthal, G., & Miley, G. K. 1979, A&A, 80, 13 Google Scholar
Condon, J. J. 1984, ApJ, 287, 461 Google Scholar
Condon, J. J., Cotton, W. D., Greisen, E. W., Yin, Q. F., Perley, R. A., Taylor, G. B., & Broderick, J. J. 1998, AJ, 115, 1693 (NVSS) Google Scholar
Condon, J. J., Prayer, D. T., & Broderick, J. J. 1991, AJ, 101, 362 CrossRefGoogle Scholar
Cress, C. M., & Kamionowski, M. 1998, MNRAS, 297, 486 Google Scholar
De Breuck, C., Brotherton, M. S., Tran, H. D., van Breugel, W., & Röttgering, H. J. A. 1998, AJ, 116, 13 Google Scholar
Ellis, G. F. R., & Baldwin, J. E. 1984, MNRAS, 206, 377 Google Scholar
Erickson, W. C., & Mahoney, M. J. 1985, ApJ, 299, L29 CrossRefGoogle Scholar
Erickson, W. C., Mahoney, M. J., Becker, R. H., & Helfand, D. J. 1987, ApJ, 314, L45 CrossRefGoogle Scholar
Goss, W. M., McAdam, W. B., Wellington, K. J., & Ekers, R. D. 1987, MNRAS, 226, 979 Google Scholar
Hummel, E. 1991, A&A, 251, 442 Google Scholar
Israel, F. P., & Mahoney, M. J. 1990, ApJ, 352, 30 CrossRefGoogle Scholar
Kaplan, D. L., Cordes, J. M., Condon, J. J., & Djorgovski, S. G. 2000, ApJ, in press Google Scholar
Kassim, N. E. 1989, ApJ, 347, 915 Google Scholar
Kassim, N. E., Perley, R. A., Dwarakanath, K. S., & Erickson, W. C. 1995, ApJ, 455, L59 CrossRefGoogle Scholar
Kassim, N. E., & Weiler, K. W. 1990, ApJ, 360, 184 Google Scholar
Pedlar, A., Anantharamaiah, K. R., Ekers, R. D., Goss, W. M., van Gorkom, J. H., Schwarz, U. J., & Zhao, J.-H. 1989, ApJ, 342, 769 Google Scholar
Perley, R. A., Condon, J. J., Cotton, W. D., Yin, Q. F., Wall, J. V., Kassim, N. E., & Erickson, W. C. 1999, VLA proposal AP-390 (4MASS) Google Scholar
Perley, R. A., & Erickson, W. C. 1979, ApJS, 41, 131 Google Scholar
Röttgering, H. J. A., van Ojik, R., Miley, G. K., Chambers, K. C., van Breugel, W. J. M., & de Koff, S. 1997, A&A, 326, 505 Google Scholar
Slingo, A. 1974, MNRAS, 168, 307 Google Scholar
van Breugel, W., De Breuck, C., Stanford, S. A., Stern, D., Röttgering, H., & Miley, G. 1999, ApJ, 518, L61 Google Scholar
Wall, J. V., & Jackson, C. A. 1997, MNRAS, 290, L17 Google Scholar