NASA NTRS · 19900033234
No evidence for radio-quiet BL Lacertae objects
Abstract
Using a large, flux-limited sample of faint X-ray sources, a search has been conducted for radio-quiet BL Lacertae objects. None has been found. Thirty-two X-ray-selected BL Lac objects and BL Lac candidates have been found within the sources of the Einstein Medium Sensitivity Survey (EMSS). Thirty-one of these have been observed with the VLA and all have been detected at 5 GHz. While the optical magnitudes of the EMSS BL Lac objects range from 17 to 20.8, their radio-to-optical spectral indices occupy a very small range. The very bright X-ray-selected BL Lac objects like PKS 2155-304 and Markarian 501 have similar range values. Therefore, unlike the clear dichotomy between radio-loud quasars and radio-quiet QSOs, there is no evidence for two populations of Lacertids distinguished by radio loudness.
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Stocke, John T., Morris, Simon L., Gioia, Isabella, Maccacaro, Tommmaso, Schild, R. E.. 1990-01-01. No evidence for radio-quiet BL Lacertae objects. https://ntrs.nasa.gov/citations/19900033234
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