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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

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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 S408 > 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 

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