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Optical Identification Strategies for the Molonglo Cluster Survey

Published online by Cambridge University Press:  05 March 2013

A. J. Haigh ,
J. G. Robertson  and
R. W. Hunstead
A. J. Haigh*
Affiliation:
School of Physics, University of Sydney, NSW 2006, Australia
J. G. Robertson
Affiliation:
School of Physics, University of Sydney, NSW 2006, Australia
R. W. Hunstead
Affiliation:
School of Physics, University of Sydney, NSW 2006, Australia
*
[email protected]
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Abstract

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We describe a newly refined procedure for making optical identifications of radio sources in Abell cluster fields observed with the Molonglo Observatory Synthesis Telescope (MOST). The method is based on past experience but uses a range of new tools to improve the reliability and production rate of identification lists. The COSMOS/UKST Southern Sky Object Catalogue was used to make preliminary identifications which were then inspected visually with the assistance of computer generated overlays of the MOST images and the Digitized Sky Survey (DSS). The overlaid images were essential for securing identifications for the extended sources prevalent among nearby clusters.

We find 21±1·5% of the radio sources are identified with galaxies and 4·6±0·7% with QSO candidates in a sample of 927 radio sources in 27 cluster fields. We make a preliminary attempt to separate cluster radio galaxies from interlopers on the basis of absolute magnitudes. A strong concentration of radio galaxies was found at projected distances less than 100 kpc from the cluster centres and a weaker concentration for projected distances of 100–500 kpc.

Keywords

galaxies: clustersgeneralmethods: data analysis
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 3 , 1997 , pp. 221 - 229
Copyright
Copyright © Astronomical Society of Australia 1997

References

Abell, G. O., Corwin, H. G., & Olowin, R. P. 1989, ApJ Supp. Ser., 70, 1 Google Scholar
Allington-Smith, J. R., Perryman, M. A. C., Longair, M. S., Gunn, J. E., & Westphal, J. A. 1982, MNRAS, 201, 331 CrossRefGoogle Scholar
Andernach, H., Tie, H., Sievers, A., Reuter, H. P., Junkes, N., & Wielebinski, R. 1988, A&A Suppl. Ser., 73, 265 Google Scholar
Auriemma, C., Perola, G. C., Ekers, R., Fanti, R., Lari, C., Jaffe, W. J., & Ulrich, M. H. 1977, A&A, 57, 41 Google Scholar
Collins, C. A., Heydon-Dumbleton, N. H., & MacGillivray, H. T. 1989, in The World of Galaxies, ed. H. Corwin et al. (Berlin: Springer), 21 Google Scholar
Condon, J. J. 1996, Errors in elliptical gaussian fits. Electronic preprint: http://www.cv.nrao.edu/jcondon/nvss.html Google Scholar
Drinkwater, M. J., Barnes, D. G., & Ellison, S. L. 1995, PASA, 12, 248 CrossRefGoogle Scholar
Fanti, C., Fanti, R., Feretti, L., Gioia, I. M., Giovannini, G., Gregorini, L., Marano, B., Padrielli, L., Parma, P., Tomasi, P., & Zitelli, V. 1983, A&A Suppl. Ser., 52, 411 Google Scholar
Large, M. I., Mills, B. Y., Little, A. G., Crawford, D. F., & Sutton, J. M. 1981, MNRAS, 194, 693 CrossRefGoogle Scholar
Ledlow, M. J., & Owen, F. N. 1995 a, AJ, 109, 853 Google Scholar
Ledlow, M. J., & Owen, F. N. 1995 b, AJ, 110, 1959 CrossRefGoogle Scholar
Ledlow, M. J., & Owen, F. N. 1996, AJ, 112, 9 Google Scholar
Mills, B. Y., & Hoskins, D. G. 1977, Aust. J. Phys., 11, 360 Google Scholar
Owen, F. N., White, R. A., Hilldrup, K. C., & Hanish, R. I. 1982, AJ, 87, 1083 Google Scholar
Reynolds, J. E. 1986, PhD thesis, University of Sydney Google Scholar
Robertson, J. G. 1991, Aust. J. Phys., 44, 729 CrossRefGoogle Scholar
Robertson, J. G., & Roach, G. J. 1990, MNRAS, 247, 387 Google Scholar
Slee, O. B., Roy, A. L., & Savage, A. 1994, Aust. J. Phys., 47, 145 Google Scholar
Sodré, L., Capelato, H. V., Steiner, J. E., Proust, D., & Mazure, A. 1992, MNRAS, 259, 233 CrossRefGoogle Scholar
Unewisse, A. M. 1993, PhD thesis, University of Sydney Google Scholar
Unewisse, A. M., Hunstead, R. W., & Piestrzynski, B. 1993, PASA, 10, 229 Google Scholar
White, R. L., Postman, M., & Lattanzi, M. G. 1993, in Astronomy for Wide-field Imaging, ed. H. T. MacGillivray et al. (Dordrecht: Kluwer), 167 Google Scholar
Windhorst, R. A., Kron, R. G., & Koo, D. C. 1984, A&A Suppl. Ser., 58, 39 Google Scholar