How does RGZ relate to "the Unified Radio Catalog"?
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by
JeanTate
I came across this arXiv preprint just now: "An Updated Version of the Unified Radio Catalog: A Multi-Wavelength Radio and Optical Catalog of Quasars and Radio Galaxies", by Amy Kimball and Zeljko Ivezic (1401.1535v1).
Here's the abstract (the link is dead, by the way):
We present an updated version of the Kimball & Ivezic (2008) radio catalog using updated radio and optical data, and new low-frequency radio data. The catalog, containing millions of radio sources, was created by consolidating large-area radio and optical surveys GB6 (6cm), FIRST (20cm), NVSS (20cm), WENSS (92cm), VLSSr (4m), and SDSS DR9 (optical). The region where all surveys overlap covers 3269 square degrees in the North Galactic Cap, and contains >160,000 20-cm sources, with about 12,000 detected in all five radio surveys and over one-third detected optically. Combining parameters from the sky surveys allows easy and efficient classification by radio and optical morphology and radio spectral index. The catalog is available at this http URL
"... allows easy and efficient classification by radio and optical morphology and ..." what's left for us to do then?
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by
akapinska
scientist
Do not worry! I'm familiar with this publication, as probably other on our science team. The authors never attempted to do any radio morphological classification, such as hourglass and plume, or connecting all components of one asymmetric radio galaxy to each (and so classifying as one source) - they matched component to component from various surveys, and listed all components within the proximity of each source. This is how much you can reliably do with automatic routines. But such matching doesn't do morphological classification. There's plenty undiscovered work that only work incorporating visual analysis - such as RGZ - can do!
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