Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.1802p&link_type=abstract
American Astronomical Society Meeting 202, #18.02; Bulletin of the American Astronomical Society, Vol. 35, p.724
Astronomy and Astrophysics
Astronomy
1
Scientific paper
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.
Cabanela Juan E.
Guerra Erick J.
Myers Steve
Partridge Robert B.
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