Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21722902t&link_type=abstract
American Astronomical Society, AAS Meeting #217, #229.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Radio loud active galactic nuclei (AGN) are highly luminous supermassive black hole powered radio sources residing within many galaxies. These can have jet structures as long as millions of parsecs and are the brightest persistent sources in the universe. Although AGN have been studied for many years over the entire electromagnetic spectrum there are still many unanswered questions about the birth and evolution of these powerful objects. An understanding of this process is required in order to fully appreciate the role AGN played in the early universe via feedback to their host galaxies. The high resolution provided by the NRAO's Very Long Baseline Array (VLBA) provides a unique tool, allowing investigation of these structures near the base of the jets.
The VLBA Imaging and Polarimetry Survey (VIPS; Helmboldt et al. 2007) observed and imaged a sample of 1127 sources with a resolution of a few milli-arcseconds utilizing full polarization. A subsequent 153 hours of multi-frequency (5, 8.4 & 15 GHz) full polarization follow-up VLBA observations were performed on a subset of 105 Compact Symmetric Object (CSO) candidates, identified in VIPS, to spectrally and morphologically classify them. CSOs are radio galaxies less than a kiloparsec in extent, and are of interest as they are likely an early stage in the evolution of radio galaxies. Since the hotspots terminate so close to the central engine of the galaxy they also provide a unique way to study this environment, and can be used to test the predictions of unified schemes. Here I will present the results of those follow-up observations and attempt to ascertain what this tells us about the growth of AGN.
Helmboldt Joseph F.
Pearson Timothy. J.
Readhead Anthony C. S.
Romani Roger W.
Taylor Greg B.
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