Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713407g&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #134.07; Bulletin of the American Astronomical Society, Vol. 33, p.720
Other
Scientific paper
Radio sources with spectral peaks at frequencies above 4.8 GHz are difficult to detect on the basis of available surveys since the highest frequency radio survey of any substantial solid angle of the sky is the Green Bank 6 cm survey. Models of radio source evolution predict the existence of GigaHertz peaked spectrum sources with peak frequencies above 4.8 GHz as the precursors of other classes of radio sources, such as compact symmetric objects and compact steep-spectrum sources. Models of thermal synchrotron emission from advection-dominated accretion outflows predict another class of radio source with spectra that peak above 4.8 GHz. The fluxes, number counts, spectra, and other properties of these inverted-spectrum radio sources may be used to constrain both models. Also, inverted-spectrum radio sources might be a significant foreground for cosmic microwave background (CMB) anisotropy experiments because a steeply rising spectrum can mimic the Rayleigh-Jeans portion of the CMB spectrum. Radio sources with inverted spectra up to 4.8 GHz should have peak frequencies around 4.8 GHz or even higher. Besides surveys at higher frequencies, the selection of sources with inverted spectra between 1.4 GHz and 4.8 GHz is the most promising method of detecting radio sources with peak frequencies above 4.8 GHz. K-band radio observations at 20 GHz were conducted during two days in November of 1998 at the 140-foot telescope. Eleven sources were unambiguously detected at the 140-foot and were observed with the VLA in September 2000. VLA observations of these eleven sources were conducted in C, K, and Q bands. Single-epoch spectra from 4.8 GHz to 43 GHz are presented here. The relevance of these data to models of inverted-spectrum radio sources and the contribution of radio point sources to the foregrounds of CMB anisotropy experiments (such as the MAP and Planck Surveyor satellites) will be discussed.
Guerra Erick J.
Haarsma Deborah B.
Partridge Robert B.
Spence M. J.
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