A study of radio objects with continuous optical spectra - Search for spectral features with the six-meter telescope

Details A study of radio objects with continuous optical spectra - Search for spectral features with the six-meter telescope A study of radio objects with continuous optical spectra - Search for spectral features with the six-meter telescope

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989azh....66.1132l&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 66, Nov.-Dec. 1989, p. 1132-1141. In Russian.

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Radio Sources (Astronomy), Radio Spectra, Telescopes, Visible Spectrum, Bl Lacertae Objects, Blazars, Brightness Distribution, Emission Spectra, Quasars, Spectral Line Width

Scientific paper

The results of spectral observations by means of the 1000-channel photon counter on the six-meter telescope of 13 radio objects with continuous optical spectra (ROCOs) are given. In the spectra of the nine 'bright' ROCOs (m of about 16) with flat radio spectra, neither narrow features (less than 10 A) with Delta I/I(cont) greater than 0.07-0.15, nor wide lines (20-40 A) with Delta I/I(const) greater then 0.04-0.08 were detected. The data are consistent with the hypothesis that these ROCOs are BL Lac-type objects with luminosities in the Mg II 2978 line not exceeding or comparable to those of the known lacertid. For the four 'faint' ROCOs (m of 18.5-19) with steep radio spectra up to cm wavelengths, wide emission lines with contrasts of 0.2-0.3 have been positively detected. Redshifts, equivalent widths and half-widths of the lines are determined, and absolute magnitudes and luminosities in the lines are estimated. Two of these objects are classified as radio quasars with steep radio spectra, and the other two as intermediate between blazars and ordinary radio quasars.

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