Spectral Index Mapping of the Quasar 3C345

Details Spectral Index Mapping of the Quasar 3C345 Spectral Index Mapping of the Quasar 3C345

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.5605l&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #56.05; Bulletin of the American Astronomical Society, Vol. 25, p.1382

Astronomy and Astrophysics

Astronomy

Scientific paper

The results of spectral index mapping of the quasar 3C345 are presented. Three VLBI maps of the quasar were obtained at 1.3 (June 92), 3.6 (September 92), and 6cm (June 92). The spectral index maps were produced in AIPS by comparison pairs at adjacent wavelengths: 1.3cm iff 3.6cm; 3.6cm iff 6cm. Because of the high dynamic range of the given VLBI maps, it is possible to probe spectral index distribution along and across the jet, up to ~10 mas away from the core. This shows a flatter spectrum in the places of bright component locations, along with a steepening toward the jet limbs. Zero spectral index in the core might be considered as an independent size indicator, allowing to determine the core size, the knowledge of which is essential for cosmology related studies. In addition to mapping, we calculated the components spectral indices, using the component fluxes obtained from model fitting to the data. Using two spectral indices taken with different frequency combinations, it is possible to estimate the shape of the synchrotron spectrum of the core or bright components. The obtained spectra of the bright components show significant evolution of the emission with increasing distance from the core.

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