Restrictions on the short time constant astrophysics
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The comparatively new field of short time-constant astrophysics is investigated with the aim of checking the statement that there is a maximum amount of electromagnetic energy which can be radiated at a frequencevm by an object whose size isL and during a time Δτ. Such limits are found under the assumptions that the emission is isotropic, thatL≃cΔτ, and for the following four radiation mechanisms: incoherent synchrotron radiation, synchrotron maser, antenna radiation and for one simple case of radiation by a turbulent plasma. These limits are compared and found to be consistent with experimental data referring to the Sun, the pulsar NP 0532, the Quasar 3C 273 and the Seyfert galaxy NGC 4151.
The main conclusion is that extragalactic radio astronomy at the present sensitivity level of observations is not likely to allow for the detection of pulses lasting less than 0.1 s.
KeywordsRadiation Experimental Data Maximum Amount Synchrotron Radiation Electromagnetic Energy
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- Bondi, H.: 1971,Quart. J. Roy. Astron. Soc. 11, 443.Google Scholar
- Bradt, H., Rappaport, S., Mayer, W., Nather, R. E., Warner, B., MacFarlane, M. and Kristian, J.: 1969,Nature 222, 728.Google Scholar
- Dodson, H. W.: 1958, in G. P. Kuiper (ed.),The Sun, Vol. 1, The University of Chicago Press, Chicago, p. 696.Google Scholar
- Ginzburg, V. L. and Zheleznyakov, V. V.: 1970,Comm. Astrophys. Space Phys. 2, 167.Google Scholar
- Kellerman, K. I.: 1971, in D. E. Evans (ed.), ‘External Galaxies and Quasi-Stellar Objects’,IAU Symp. 44, 203.Google Scholar
- Kleinmann, D. E. and Low, F. J.: 1970,Astrophys. J. Letters 159, 165.Google Scholar
- Richards, D. W.: 1970,Publ. Astron. Soc. Pacific 82, 438.Google Scholar
- Smith, H. J.: 1965,Quasi Stellar Sources and Gravitational Collapse, Chicago Univ. Press, 221.Google Scholar
- Teske, R. G.: 1971,Solar Phys. 17, 181.Google Scholar
- Warner, B., Nather, R. E., and MacFarlane, M.: 1969,Nature 222, 233.Google Scholar
- Zhelenzyakov, V. V.: 1967,Soviet Astron. AJ 11, 33.Google Scholar