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2.23 and 8.29 GHz Observations of CSS-GPS Candidates

  • D. Dallacasa (a1) (a2), M. Bondi (a1) (a2), F. Mantovani (a1) (a2) and W. Alef (a1) (a2)

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Compact Steep-Spectrum (CSS) and GHz-Peaked Spectrum (GPS) radio sources are intrinsically small objects (Fanti et al. 1990) with high frequency steep spectra (α > 0.5 with S∝ v –α), found at moderate or high redshifts (z>0.2 but many objects have z>1.5). Their characteristics have been interpreted in terms of youth (e.g. Fanti et al. 1995) or “frustration” (e.g. van Breugel et al. 1984). Their radio spectra turn over at tens or a few hundreds of MHz (CSS) or at higher frequencies (GPS), interpreted as due to synchrotron self-absorption. They represent a significant fraction of flux limited catalogues (15–30 %, depending on the frequency).

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References

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van Breugel, W.J.M., Miley, G.K., Heckman, T.M. 1984, AJ , 89, 5.
Dallacasa, D., et al. 1995, A&A , 295, 27.
Fanti, C., et al. 1995, A&A , 302, 317.
Fanti, R., et al. 1990, A&A , 231, 333.
Spencer, R.E., et al. 1989, MNRAS , 240, 657.

2.23 and 8.29 GHz Observations of CSS-GPS Candidates

  • D. Dallacasa (a1) (a2), M. Bondi (a1) (a2), F. Mantovani (a1) (a2) and W. Alef (a1) (a2)

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