Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..719s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, April 15, 1986, p. 719-728.
Astronomy and Astrophysics
Astronomy
16
Astronomical Spectroscopy, Radio Sources (Astronomy), Spectrum Analysis, Astronomical Maps, Radiant Flux Density, Very Long Base Interferometry
Scientific paper
Data from 4885-MHz VLA observations made in August and September 1982, and 1661-MHz European VLBI network observations made in October 1982, of seven extended radio sources suspected of having steep-spectrum cores (SSCs) are presented. The two-point 6- to 20-cm wavelength core spectral index of 1250-102 is found to be about 0.2. The 6-cm wavelength observations indicate incorrect core identification in 1422 + 202 and 1547 + 309, and overestimated core spectral indexes for the remaining sources. Present 6-cm wavelength core flux densities and previous 8.1-GHz NRAO measurements (Owen et al., 1978; Potash and Wardle, 1979) give core spectral indexes of around -0.1 for 1007 + 417, 0.0 for 1423 + 242, and -1.7 for 2355 + 490. Results indicate that true SSCs associated with extended radio source nuclei are very rare.
Kulkarni Vasant K.
Porcas Richard W.
Saikia D. J.
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