NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-25 T07:31:29 PDT
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For refcode 2002MNRAS.329..877C:
Retrieve 237 NED objects in this reference.
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NED Abstract

Copyright by Royal Astronomical Society. 2002MNRAS.329..877C The CLASS blazar survey - II. Optical properties A. Caccianiga, M.J. Marcha, S. Anton, K.-H. Mack and M.J. Neeser ABSTRACT This paper presents the optical properties of the objects selected in the CLASS blazar survey. Because an optical spectrum is now available for 70 per cent of the 325 sources present in the sample, a spectral classification, based on the appearance of the emission/absorption lines, is possible. A wide variety of optical spectral types is found. Besides 'classical' BL Lacs (42), BL Lac candidates (5) and high-power (P_5 GHz_ > 10^26^ W Hz^-1^) flat spectrum radio quasars (67), a significant number of 'passive' elliptical galaxies (41) is also found. Moreover, 33 broad emission line objects with a low radio power (P_5 GHz_ < 10^26^ W Hz^-1^) are discovered, suggesting that at least a fraction (~24-30 per cent) of low-power blazars have a broad line region. Finally, 34 objects showing only narrow emission lines, either as a result of some starburst activity in the host galaxy or as a result of the presence of an active galactic nucleus, appear in the sample. Keywords: surveys - galaxies: active - BL Lacertae objects: general - quasars: general.
Retrieve 237 NED objects in this reference.
Please click here for ADS abstract

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