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For refcode 1994MNRAS.267..167G:
Retrieve 46 NED objects in this reference.
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NED Abstract

Copyright by Royal Astronomical Society. 1994MNRAS.267..167G A comparison of the radio-submillimetre spectra of BL Lacertae objects and flat-spectrum radio quasars W. K. Gear, J. A. Stevens, D. H. Hughes, S. J. Litchfield, E. I. Robson, H. Terasranta, E. Valtaoja, H. Steppe, M. F. Aller and H. D. Aller Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ Centre for Astrophysics. University of Central Lancashire, Preston PAl 2HE Department of Physics, Nuclear Physics Laboratory, Keble Road, Oxford OX1 3RH Joint Astronomy Centre, 660 N. A ohoku Place, University Park, Hilo, Hawaii 96720. USA Metsahovi Radio Research Station, Helsinki Univ. of Technology, Otakaari 5A, SF02150 Espoo. Finland Instituto de Radioastronomia Milimetrica, Avenida Divina Pastora 7. Nucleo Central, E 18012 Granada, Spain Astronomy Department. University of Michigan. Ann Arbor, MI 48109-1090. USA Accepted 1993 October 22. Received 1993 October 20; in original form 1993 May 11 ABSTRACT We present quasi-simultaneous radio, millimetre and submillimetre spectra of 22 BL Lac objects and 24 radio-loud, violently variable quasars. These data are used to test the hypothesis that BL Lacs and OVV quasars are fundamentally different objects. We find a considerable degree of consistency of the overall spectral shape in all sources and conclude that the same basic physical model applies to the continuum emission over this frequency range in both cases. There is clear evidence in the data for the BL Lacs to have flatter 150-375 GHz spectra, and we attribute the effect to an intrinsic difference between the underlying jets in the two types of object. A similar difference in the 37-270 GHz spectral indices between the two types can be attributed to a simple redshifting of the synchrotron self-absorption turnover. Key words: BL Lacertae objects: general - galaxies: jets - quasars: general - radio continuum: galaxies.
Retrieve 46 NED objects in this reference.
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