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9.10. The cause of the spectral turnover in the GPS source 0108+388: free-free absorption or SSA?

  • J. M. Marr (a1), F. Crawford (a2) and G. B. Taylor (a3)

Extract

The radio source 0108 + 388 is a canonical example of a class of extragalactic radio sources, referred to as Gigahertz-Peaked Spectrum (GPS) sources, whose spectra peak at high frequencies. There are two competing models for the cause of the high frequency turnover: free-free absorption (f-f) of the lower frequency radiation by ionized gas in the host galaxies (e.g. van Breugel 1984), or synchrotron self-absorption (SSA) due to exceptionally large magnetic fields, (e.g. Hodges, Mutel, & Phillips 1984).

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References

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Baum, S. A. et al. 1990, A&A, 232, 19.
van Breugel, W. 1984, IAU Symp. 110, p. 59.
Conway, et al. 1994, ApJ, 425, 568.
Hodges, M. W., Mutel, R. L., & Phillips, R. B. 1984, AJ, 89, 1327.
Kellerman, K. I. & Pauliny-Toth, I. I. K. 1981, Ann. Rev. Astr. Astrophys., 19, 373.
Taylor, G. B., Readhead, A. C. S., & Pearson, T. J. 1996, ApJ, 463, 95.

9.10. The cause of the spectral turnover in the GPS source 0108+388: free-free absorption or SSA?

  • J. M. Marr (a1), F. Crawford (a2) and G. B. Taylor (a3)

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