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Radio Polarisation Studies of Galaxies at z > 2

  • R.M. Athreya (a1), V.K. Kapahi (a1), P.J. Mccarthy (a2) and W. Van Breugel (a1) (a2) (a3)

Extract

We present some interesting results from a radio study of 17 radio galaxies at z >2, selected from a complete sample of Molonglo sources with S 408 > 0.95 Jy for which optical identifications and spectroscopic redshifts are being obtained in a major observational programme (Kapahi et al. 1995).

Observations and results : The 17 galaxies were mapped using the VLA at 1.4, 4.8 and 8.3 GHz with the highest resolution of ≃ 0.3″ at 8.3 GHz. The integrated spectra are generally quite steep and convex in many sources, steepening to α ≥ 1.2 (Sv –α) at the highest frequency. Most of the sources have a double structure with sizes ranging up to 22″. Unresolved radio cores, coincident with the optical galaxies, are detected at the mJy or sub-mJy level in most cases. Several sources also show one-sided jetlike features. Surprisingly, most of the cores appear to have steep spectra between 5 and 8.3 GHz!

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Copyright

References

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Antonucci, R., Barvainis, R. and Alloin, D. (1990) Ap.J , Vol. 353, pp.416418.
Barthel, P.D. (1989) Ap.J , Vol. 336, pp.606611.
Gear, W.K. et al. (1994) MNRAS , Vol. 267, pp.167186.
Kapahi, V.K. et al. (1995) The Molonglo 1 Jy sample of radio galaxies - This Volume.
Taylor, G.B., Inoue, M. and Tabara, H. (1992) Astron. Astrophys. , Vol. 264, pp.421427.

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