Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..381e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, July 15, 1989, p. 381-399.
Astronomy and Astrophysics
Astronomy
9
Extragalactic Radio Sources, Radio Spectra, Relativistic Effects, Bl Lacertae Objects, Blazars, Galaxies, Quasars, Spectral Correlation, Spectrum Analysis
Scientific paper
Multiepoch radio spectra of 308 extragalactic radio sources taken from the 1-Jy catalog (Kuhr et al., 1981) are analyzed, correlating the spectral index, spectral curvature, and degree of variability. These quantities are statistically interdependent, and their distributions can be used to distinguish between galaxies, quasars, optically violent variable sources, and BL Lac objects. These spectral associations are explained using a relativistic beaming model involving a nonvariable steep spectrum component and a core component with an inverted spectrum exhibiting an intrinsic variability of about 30 percent. At 5 GHz, the flux density ratio of the core component (seen at an angle of 90 deg) to the steep-spectrum component is about 0.03 or larger.
Eckart Andreas
Hummel Christian A.
Witzel Andreas
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