No evidence for radio-quiet BL Lacertae objects

Details No evidence for radio-quiet BL Lacertae objects No evidence for radio-quiet BL Lacertae objects

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..141s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 141-146. Research supported by the Smithsonian Instit

Astronomy and Astrophysics

Astronomy

89

Bl Lacertae Objects, Extragalactic Radio Sources, Quasars, Very Large Array (Vla), X Ray Sources, Heao 2, Milky Way Galaxy, Radio Emission, Sky Surveys (Astronomy)

Scientific paper

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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