Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-30T05:45:33.784Z Has data issue: false hasContentIssue false

Radio Polarisation Studies of Galaxies at z > 2

Published online by Cambridge University Press:  25 May 2016

R.M. Athreya
Affiliation:
1NCRA(TIFR) - Pune univ. campus, Pune 411 007. INDIA
V.K. Kapahi
Affiliation:
1NCRA(TIFR) - Pune univ. campus, Pune 411 007. INDIA
P.J. Mccarthy
Affiliation:
2OCIW - 818, Santa Barbara Street, Pasadena, CA. USA
W. Van Breugel
Affiliation:
1NCRA(TIFR) - Pune univ. campus, Pune 411 007. INDIA 2OCIW - 818, Santa Barbara Street, Pasadena, CA. USA IGPP/LLNL - P.O. Box 808, Livermore, CA 94550. USA

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.

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!

Type
Properties of Radio Sources
Copyright
Copyright © Kluwer 1996 

References

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