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For refcode 1995A&AS..113..409S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1995A&AS..113..409S Millimeter-wavelength observations of compact steep-spectrum sources H. Steppe, S. Jeyakumar, D.J. Saikia and C.J. Salter Institut de Radioastronomie Millimetrique, Avenida Divina Pastora 7, Nucleo Central, 18012 Granada, Spain Tata Institute of Fundamental Research, National Centre for Radio Astrophysics, Poona University Campus, Post Bag No. 3, Ganeshkhind, Pune 411007, India Arecibo Observatory, P.O. Box 995, Arecibo, Puerto Rico 00613, U.S.A. Received March 3; accepted March 13,1995 Abstract. - Using the IRAM 30-m telescope, we have measured 90- and 230- GHz flux densities for a sample of 76 sources, about 70 of which are compact steep-spectrum radio sources (CSSs). These flux densities have been used to extend the radio spectra of the CSSs to millimeter wavelengths, and look for deviations of their high-frequency spectra from the trends established at lower frequencies. Since flat-spectrum, cm- wavelength, nuclear components have been detected in some of these sources, it is possible that such radio cores are self-absorbed at cm wavelengths, but could make their presence felt in the mm range via a flattening of the integrated spectrum. Alternatively, if the nucleus is no longer active and there is no fresh supply of energy to the extended features, one might find high-frequency spectral steepening caused by radiative losses. In this paper we present the results of our observations and discuss their implications. Key words: galaxies: active - galaxies: nuclei - quasars: general - radio continuum: galaxies
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