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Proper Motions in Compact Symmetric Objects

Published online by Cambridge University Press:  05 March 2013

A. G. Polatidis  and
J. E. Conway
A. G. Polatidis
Affiliation:
Max Planck Institut für Radioastronomie, Postfach 2024, D-53010, Bonn, Germany
J. E. Conway
Affiliation:
Onsala Space Observatory, Chalmers Technical University, Onsala S-43992, Sweden
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Abstract

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We discuss recent measurements of proper motions of the hotspots of compact symmetric objects (CSOs). Source expansion has been detected in 10 CSOs so far and all these objects are very young (≤ 3 × 103 yr). In a few sources ages have also been estimated from energy supply and spectral ageing arguments and these estimates are comparable. This argues that these sources are close to equipartition and that standard spectral ageing models apply. Proper motion studies are now constraining hotspot accelerations, side-to-side motions, and differences in hotspot advance speeds between the two hotspots of a source. Although most CSOs are young sources their evolution is unclear. There is increasing evidence that in some objects the CSO structure represents a new phase of activity within a recurrent source.

Keywords

galaxies: activegalaxies: compactgalaxies: evolution
Type
GPS/CSS Workshop
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 1 , 2003 , pp. 69 - 74
Copyright
Copyright © Astronomical Society of Australia 2003

References

Blundell, K. M., & Rawlings, S. 2000, AJ, 119, 1111 CrossRefGoogle Scholar
Conway, J. E., Pearson, T. J., Readhead, A. C. S., Unwin, S. C., Xu, W., & Mutel, R. M. 1992, ApJ, 396, 62 CrossRefGoogle Scholar
Conway, J. E., Myers, S. T., Pearson, T. J., Readhead, A. C. S., Unwin, S. C., & Xu, W. 1994, ApJ, 425, 568 Google Scholar
Conway, J. E. 2002, NewAR, 46, 263 Google Scholar
Isobe, T., et al. 1990, ApJ, 364, 104 Google Scholar
Lara, L., Cotton, W. D., Feretti, L., Giovannini, G., Marcaide, J. M., Márquez, I., & Venturi, T. 2001, A&A, 370, 409 Google Scholar
Marecki, A., Barthel, P. D., Polatidis, A., & Owsianik, I. 2003, PASA, 20, in pressGoogle Scholar
Murgia, M., Fanti, C., Fanti, R., Gregorini, L., Klein, U., Mack, K.-H., & Vigotti, M. 1999, A&A, 345, 769 Google Scholar
Murgia, M. 2003, PASA, 20, in pressGoogle Scholar
Norman, M. 1996, in Energy Transport in Radio Galaxies and Quasars, ASP Conf. Series 100, ed. P. E. Hardee, A. H. Bridle, & J. A. Zensus (San Francisco: ASP), 405 Google Scholar
O'Dea, C. P., & Baum, S. A. 1997, AJ, 113, 148 Google Scholar
Owsianik, I., & Conway, J. 1998, A&A, 337, 69 (OC98)Google Scholar
Owsianik, I., Conway, J., & Polatidis, A. 1998, A&A, 336, L37 (OCP98)Google Scholar
Phillips, R. B., & Mutel, R. L. 1982, A&A, 106, 21 Google Scholar
Polatidis, A. G., Wilkinson, P. N., Xu, W., Readhead, A. C. S., Pearson, T. J., Taylor, G. B., & Vermeulen, R. C. 1999, NewAR, 43, 657 CrossRefGoogle Scholar
Polatidis, A. G. 2001, in Similarities and Universalities of Relativistic Flows, ed. M. Georganopoulos et al. (Berlin: Logos Verlag), 96 Google Scholar
Polatidis, A. G., Owsianik, I., & Conway, J. E. 2003, A&A, submitted (POC03)Google Scholar
Readhead, A. C. S., Xu, W., Pearson, T. J., Wilkinson, P. N., & Polatidis, A. G. 1994, in Compact Extragalactic Radio Sources, Proc. NRAO Workshop 23, eds. J. A. Zensus & K. I. Kellermann (Socorro: NRAO), 17 Google Scholar
Readhead, A. C. S., Taylor, G. B., Xu, W., Pearson, T. J., Wilkinson, P. N., & Polatidis, A. G. 1996, ApJ, 460, 612 (RPX96)CrossRefGoogle Scholar
Reynolds, C. S., & Begelman, M. C. 1997, ApJ, 487, L135 CrossRefGoogle Scholar
Rudnick, L. 2002, NewAR, 46, 95 CrossRefGoogle Scholar
Scheuer, P. 1982, in Extragalactic Radio Sources, IAU Symposium 97, eds. D. S. Heeschen & C. M. Wade (Dordrecht: Reidel), 163 Google Scholar
Snellen, I. A. G., Schilizzi, R. T., Miley, G. K., de Bruyn, A. G., Bremer, M. N., & Röttgering, H. J. A. 2000, MNRAS, 319, 445 Google Scholar
Stanghellini, C., Liu, X., Dallacasa, D., & Bondi, M. 2002, NewAR, 46, 287 CrossRefGoogle Scholar
Stanghellini, C. 2003, PASA, 20, in pressGoogle Scholar
Taylor, G. B., Readhead, A. C. S., & Pearson, T. J. 1996, ApJ, 463, 95 CrossRefGoogle Scholar
Taylor, G. B., & Vermuelen, R. C. 1997, ApJ, 485, L9 CrossRefGoogle Scholar
Taylor, G. B., et al. 2000, ApJ, 541, 112 (TMP00)Google Scholar
Tingay, S. J., & de Kool, M. 2003, PASA, 20, in pressGoogle Scholar
Tschager, W., Schilizzi, R. T., Rottgering, H. J. A., Snellen, I. A. G., & Miley, G. K. 2000, A&A, 360, 887 Google Scholar
Tzioumis, A. K., et al. 1989, AJ, 98, 36 Google Scholar
Wilkinson, P. N., Polatidis, A. G., Readhead, A. C. S., Xu, W., & Pearson, T. J. 1994, ApJ, 432, L87 Google Scholar