Spectral Indices of Core and Extended Components of Extragalactic Radio Sources

Details Spectral Indices of Core and Extended Components of Extragalactic Radio Sources Spectral Indices of Core and Extended Components of Extragalactic Radio Sources

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003chjaa...3..415z&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 3, No. 5, p. 415-422

Astronomy and Astrophysics

Astrophysics

3

Galaxies: Active, Radio Continuum: Galaxies

Scientific paper

We use observed peak and total flux densities at 6 cm and 20 cm to determine the spectral indices separately for the core and extended components of QSOs and galaxies, as well as their core-dominance parameters. Our results indicate that 1) Nine QSOs show both greater than 1.0 core-dominance parameters (those objects should be blazars) and greater than 0.5 spectral indices. The average core spectral index is αCore = 0.85±0.21 for the nine blazars, which implies that it is not reliable to use αradio=0.0 for blazars. For the different subclasses, the core andextended spectral indices are as follows: for the blazars, αCore = 0.22±0.06 and αExt =0.77±0.12; the galaxies, αCore = 1.01±0.13 and αExt =0.83±0.21, and for the QSOs, αCore = 0.28±0.10 and αExt =0.68±0.08. 2) The core spectral index and core dominance parameter (R) show an anti-correlation, αC = (-1.28±0.26) log R +(0.65±0.11); 3) R is approximately linearly correlated with redshift (z).}

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