Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-08-22
Astronomy and Astrophysics
Astrophysics
Accepted A&A. 13 pages
Scientific paper
This paper concerns the relationship of BLLacs and flat spectrum weak emission-line galaxies. We compare the weak emission-line galaxies and the BLLacs in a sample of 57 flat spectrum objects (Marcha et al. 1996), using high-frequency radio and non-thermal optical flux densities, spectral indices and polarization properties. We consider whether objects which are not `traditional' BLLacs-due to their larger emission line strengths, and larger CaII spectral breaks-are simply starlight diluted BLLacs. Their broad-band spectral properties are consistent with this interpretation, but their radio polarization may indicate more subtle effects. Comparison of the weak emission-line galaxies and the BLLacs shows that, on average, the former have steeper spectra between 8 and 43GHz, and are less polarized at 8.4GHz. This is consistent with many of the weak-lined objects being at larger angles to the line of sight than the BLLacs. In addition to this population, we indicate a number of the weak emission-line galaxies which may be `hidden BLLacs': relativistically boosted objects very close to the line of sight with an apparently weak AGN.
Dennett-Thorpe Jane
Marcha J. M. M.
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