Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-25T04:41:04.706Z Has data issue: false hasContentIssue false
  • English
  • Français

The Dynamic Radio Sky

Published online by Cambridge University Press:  20 April 2012

James M. Cordes
James M. Cordes*
Affiliation:
Astronomy Department, Cornell University, Ithaca, NY 14853, USA email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The radio band is known to be rich in variable and transient sources, but exploration of it has only begun only in the last few years. Relevant time scales are as small as a fraction of a nanosecond (giant pulses from the Crab pulsar). Short transients (less than one second, say) have signal structure in the time-frequency plane at the very least because of interstellar plasma propagation effects (dispersion and scattering), and in some cases due to emission structure. Optimal detection requires handling a range of signal types in the time-frequency plane. Short bursts by necessity have very large effective radiation brightness temperatures associated with coherent emission processes. This paper surveys relevant source classes and summarizes propagation effects that must be considered to optimize detection in large-scale surveys. Scattering horizons for the interstellar and intergalactic media are defined, and the role of the radio band in panchromatic and multimessenger studies is discussed.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S285: New Horizons in Time-Domain Astronomy , September 2011 , pp. 49 - 54
Copyright
Copyright © International Astronomical Union 2012

References

Bower, G. C., et al. , 2007, ApJ, 666, 346CrossRefGoogle Scholar
Camilo, F., et al. , 2006, Nature, 442, 892CrossRefGoogle Scholar
Cordes, J. M. & Lazio, T. J. W. 2002, astro-ph/0207156Google Scholar
Cordes, J. M. 2007 SKA Memo 97, http://www.skatelescope.org, 2007Google Scholar
Frail, D. A., et al. , 2011, arXiv:1111.0007Google Scholar
Hallinan, G., et al. , 2007, ApJL, 663, 25CrossRefGoogle Scholar
Hankins, T. H. & Eilek, J. A. 2007, ApJL, 670, 693CrossRefGoogle Scholar
Hansen, B. M. S. & Lyutikov, M. 2001, MNRAS, 322, 695CrossRefGoogle Scholar
Hyman, S. D., et al. , 2006, ApJ, 639, 348CrossRefGoogle Scholar
Kramer, M., et al. , 2006, Science, 312, 549CrossRefGoogle Scholar
Koay, J. Y., et al. , 2011, AstAp, 534, L1Google Scholar
McLaughlin, M. A., et al. , 2006, Nature, 439, 817CrossRefGoogle Scholar
Ofek, E. O., et al. , 2011, ApJ, 740, 65CrossRefGoogle Scholar
Osten, R. A. & Bastian, T. S. 2008, ApJ, 674, 1078CrossRefGoogle Scholar
Rickett, B. J. 1990, ARAA, 28, 561CrossRefGoogle Scholar
Soderberg, A. M., et al. , 2010, Nature, 463, 513CrossRefGoogle Scholar