A VLBI study of GHz-Peaked-Spectrum radio sources

II. Additional VLBI images at 6 cm

¹ Istituto di Radioastronomia del CNR, C.P. 141, I-96017 Noto SR, Italy
² Visitor at the Space Telescope Science Institute, Baltimore
³ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, U.S.A.
⁴ Jet Propulsion Laboratory, MS 238-600, 4800 Oak Grove Drive, Pasadena, CA 91109, U.S.A.

Send offprint request to: C. Stanghellini

Received: 15 July 1998
Accepted: 21 August 1998

Abstract

We present VLBI observations at 5 GHz of 11 GHz Peaked Spectrum (GPS) or candidate GPS sources. Two of them belong to the complete sample defined by Stanghellini et al. (1998) (the GPS 1 Jy sample), while the others are selected from a heterogeneous list compiled by O'Dea et al. (1991). Morphologies of the sources presented here are similar to those found in Stanghellini et al. (1997) and in the small Compact Steep Spectrum (CSS) sources studied by Dallacasa et al. (1995). Our results strengthen the evidence that GPS quasars tend to have core-jet or complex morphology and GPS galaxies tend to be compact symmetric objects (CSO).