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

Published online by Cambridge University Press:  25 May 2016

J. M. Marr ,
F. Crawford III  and
G. B. Taylor
J. M. Marr
Affiliation:
Union College, Schenectady, NY
F. Crawford III
Affiliation:
M.I.T., Boston, MA
G. B. Taylor
Affiliation:
N.R.A.O., Socorro, NM

Extract

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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).

Type
Part III. Black Holes and Central Activity
Information
Symposium - International Astronomical Union , Volume 184: The Central Regions of the Galaxy and Galaxies , 1998 , pp. 401 - 402
Copyright
Copyright © Kluwer 1998 

References

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Hodges, M. W., Mutel, R. L., & Phillips, R. B. 1984, AJ, 89, 1327.CrossRefGoogle Scholar
Kellerman, K. I. & Pauliny-Toth, I. I. K. 1981, Ann. Rev. Astr. Astrophys., 19, 373.Google Scholar
Taylor, G. B., Readhead, A. C. S., & Pearson, T. J. 1996, ApJ, 463, 95.Google Scholar