5-GHz MERLIN and VLBA observations of compact 9C sources

Details 5-GHz MERLIN and VLBA observations of compact 9C sources 5-GHz MERLIN and VLBA observations of compact 9C sources

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.367..323b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 367, Issue 1, pp. 323-330.

Astronomy and Astrophysics

Astronomy

9

Surveys-Galaxies: Active-Radio Continuum: General

Scientific paper

In this paper, we present subarcsecond resolution observations of 36 compact sources from the 15h region of the 15-GHz 9th Cambridge survey. These sources all have previously measured simultaneous continuum radio spectra spanning 1.4-43GHz and we classify each source by fitting a quadratic function to its spectrum. Using the Multi-Element Radio-Linked Interferometer Network and the Very Long Baseline Array, both at 5GHz, we resolve all six steep-spectrum objects and four of the 13 flat-spectrum objects. However, none of the 16 objects with convex spectra peaking above 2.5GHz is resolved even at <3-mas resolution. These results, in combination with the findings of a 15-GHz variability study, suggest that emission from the high-frequency peaking objects is affected by relativistic beaming, and that these objects are not necessarily as young as the synchrotron self-absorption interpretation of their peak frequencies would imply.

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