Flat radio-spectrum galaxies and BLLacs: Part I: core properties

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dc.creatorDennett-Thorpe, J.
dc.creatorMarcha, M. J.
dc.date2000-08-22
dc.date.accessioned2026-07-07T01:55:02Z
dc.date.available2026-07-07T01:55:02Z
dc.descriptionThis 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.
dc.descriptionAccepted A&A. 13 pages
dc.identifierhttps://arxiv.org/abs/astro-ph/0008343
dc.identifierhttp://arxiv.org/abs/astro-ph/0008343
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1520
dc.subjectAstrophysics
dc.titleFlat radio-spectrum galaxies and BLLacs: Part I: core properties
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