Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111...53o&link_type=abstract
Astronomical Journal v.111, p.53
Astronomy and Astrophysics
Astronomy
41
Bl Lacertae Objects: General, Galaxies: Active, Radio Lines: Galaxies
Scientific paper
As part of our optical spectroscopic study of radio galaxies in Abell clusters, we report a search for BL Lac phenomena in our sample. As an indicator of possible nonthermal activity in the nuclei of our radio galaxies, we report D(4000), a measure of the 4000 A break, for 190 objects. None of the objects in our sample are found which meet the tions for BL Lac objects both for D(4000) and for weakness of emission lines. We do find 15 objects which have diluted 4000 A breaks [D(4000)<= 1.8], and these are discussed individually. At least four of them appear to have weak nonthermal activity which may be related to the BL Lac phenomena. These results appear to be in conflict with the simplest BL Lac/FR I unification model. Several ways out of this dilemma are discussed. Perhaps the most likely change in this model is the inclusion of FR II radio galaxies as part of the parent population of BL Lac objects.
Keel William C.
Ledlow Michael J.
Owen Frazer N.
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