Hostname: page-component-745bb68f8f-kw2vx Total loading time: 0 Render date: 2025-02-03T11:54:55.837Z Has data issue: false hasContentIssue false
  • English
  • Français

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

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 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

Baum, S. A. et al. 1990, A&A, 232, 19.Google Scholar
van Breugel, W. 1984, IAU Symp. 110, p. 59.Google Scholar
Conway, et al. 1994, ApJ, 425, 568.Google Scholar
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