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R.B. Partridge, J.E. Cabanela (Haverford College), S. Myers, E.J. Guerra (NRAO)
We have compared the GB6 6 cm survey of radio sources with the VLA-FIRST 21 cm survey to select 400 extragalactic radio sources with strongly inverted spectra: n>0.4. More than 160 of these sources were re-measured at 21 and 6 cm wavelength in Sept. 2001, and simultaneously observed at 3.5 and 1.4 cm to construct same-epoch radio spectra. We report on the radio SEDs and on the optical properties of the ~100 optically identified sources. Of these, 40-45 in appearance. Roughly 40 sources, many with a spectral peak at n>10 GHz. We also summarize follow-up observations made in Feb.-March 2003,at frequencies up to 43 GHz, of 40 of the most interesting cases. We have re-measured 3.5 and 1.4 cm fluxes to look for variability, and will measure polarization at these wavelengths as well. These extreme GPS and rising-spectrum sources are expected to have high density cores that exhibit synchrotron self-absorption, and are therefore likely to be very recently formed radio sources. Research supported in part by NSF grant AST-0071192 to Haverford College.
The author(s) of this abstract have provided an email address for comments about the abstract: bpartrid@haverford.edu
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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.