The most compact bright radio-loud AGN : I. A new target sample selected for the space VLBI

An, T. and Wu, X. and Frey, Sándor (2014) The most compact bright radio-loud AGN : I. A new target sample selected for the space VLBI. ASTROPHYSICS AND SPACE SCIENCE, 352. pp. 825-832. ISSN 0004-640X

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Abstract

We investigated the archival ground-based VLBI images of the extragalactic radio sources included in both the Wilkinson Microwave Anisotropy Probe (WMAP) and the Planck catalogues, and selected 49 bright and compact sources as potential targets for space Very Long Baseline Interferometry (VLBI) ob- servations at mm wavelengths. These sources have a flat radio continuum spectrum between 33 and 94 GHz. They are identified as core-dominated active galactic nuclei (AGN), located at declinations above −40◦, and have never been observed with ground-based VLBI at 86 GHz. The radio properties of the 49 new sources are presented. We compare this new sample with similar samples of compact AGN available from earlier stud- ies. The new candidates, together with the existing bright compact AGN sample identified from 86-GHz ground-based VLBI imaging surveys, form a catalogue of more than 160 AGN. These could be primary tar- gets for mm-VLBI observations on the ground, as well as for future mm-wavelength space VLBI missions such as the project with two satellites currently under study in China.

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