Identifying Compact Symmetric Objects in the Southern Sky

Abstract

We present results of multifrequency polarimetric VLBA observations of 20 compact radio sources. The observations represent the northern and southern extensions of a large survey undertaken to identify Compact Symmetric Objects (CSOs) Observed in the Northern Sky (COINS). CSOs are young radio galaxies whose jet axes lie close to the plane of the sky, and whose appearance is therefore not dominated by relativistic beaming effects. The small linear sizes of CSOs make them valuable for studies of both the evolution of radio galaxies and testing unified schemes for active galactic nuclei (AGN). In this paper we report on observations made of 20 new CSO candidates discovered in the northern and southern extremities of the VLBA Calibrator Survey. We identify 4 new CSOs, and discard 12 core-jet sources. The remaining 4 sources remain candidates pending further investigation. We present continuum images at 5 GHz and 15 GHz and, where relevant, images of the polarized flux density and spectral index distributions for the 8 new CSOs and CSO candidates.

accepted to ApJ

References in corpus (11)

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Cited by in corpus (12)

• Dating COINS: Kinematic Ages for Compact Symmetric Objects
• X-ray Properties of the GigaHertz-Peaked and Compact Steep Spectrum Sources
• Spitzer mid-infrared spectroscopy of compact symmetric objects: What powers radio-loud active galactic nuclei?
• New candidate GHz Peaked Spectrum and Compact Steep Spectrum Sources
• Flat-spectrum symmetric objects with ~1 kpc sizes I. The candidates
• VLBA Imaging Polarimetry of Active Galactic Nuclei - An Automated Approach
• VLBI-selected sample of Compact Symmetric Object candidates and frequency-dependent position of hotspots
• Multi-Frequency Optical-Depth Maps and the Case for Free-Free Absorption in Two Compact Symmetric Radio Sources: the CSO candidate J1324+4048 and the CSO J0029+3457
• SMILE: Search for MIlli-LEnses
• European VLBI Network observations of fourteen GHz-Peaked-Spectrum radio sources at 5 GHz
• EVN observations of eleven GHz-Peaked-Spectrum radio sources at 2.3/8.4GHz
• The Parsec-Scale Morphology of Southern GPS sources