J/MNRAS/348/937 The CLASS blazar survey. III. (Caccianiga+, 2004) ================================================================================ The CLASS blazar survey: testing the blazar sequence. Caccianiga A., Marcha M.J.M. =2004MNRAS.348..937C ================================================================================ ADC_Keywords: BL Lac objects ; QSOs ; Radio sources Keywords: surveys - galaxies: active - BL Lacertae objects: general - quasars: general Abstract: We discuss the properties of the sources in the CLASS blazar survey, which aims at the selection of low radio power (P_5GHz_<10^25^W/Hz) blazars. We use Very Large Array (VLA) data from available catalogues and from our own observations to constrain the radio core-dominance of the sample which, together with the flat radio spectral index, is a signature of the blazar activity. X-ray data from the ROSAT All Sky Survey were also collected in order to constrain the radio-to-X-ray luminosity ratio of the sources. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 66 236 VLA data -------------------------------------------------------------------------------- See also: VIII/40 : GB6 catalog of radio sources (Gregory+ 1996) J/MNRAS/326/1455 : The CLASS blazar survey. I. (Marcha+, 2001) J/MNRAS/329/877 : The CLASS blazar survey. II. (Caccianiga+, 2002) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 A3 --- --- [GB6] 4- 17 A14 --- GB6 GB6 name (JHHMMSS+DDMMSS), based on J2000.0 coordinates (Cat. ) 19- 20 A2 --- l_CFlux [<>= ] Limit flag on CFlux 21- 27 F7.2 mJy CFlux Core flux density at 1.4 GHz 29- 35 F7.2 mJy TFlux Total flux density at 1.4 GHz (1) 37- 38 A2 --- l_R [<>= ] Limit flag on R (2) 39- 44 F6.2 --- R Core-dominance parameter R (2) 46- 50 A5 --- r_CFlux Core data origin (3) 53- 56 A4 --- r_TFlux Total data origin (4) 59- 64 A6 --- Com Comments on double morphology -------------------------------------------------------------------------------- Note (1): The total flux density is the integrated flux density computed by us or derived from the FIRST catalogue. If more than one component is present in the FIRST catalogue the total flux density is the sum of all these components. For the few extended sources (46 in total, 37 with z< 0.3) where a fraction of the flux density could have been missed in the VLA B-configuration, we have used the NVSS integrated flux density as total flux density. Note (2): The core-dominance parameter R is defined as: R = S(core)/S(ext) * (1+z)^-1^, where S(core)is the core flux density and S(ext) the extended flux density. When the core flux is equal to the total flux or slightly larger due to the statistical fluctuation, the computed R is indicated as a lower limit. Note (3): Core Data: 'FIRST': means from the FIRST data, 'may27': or 'may11' are the dates of our own observations, made in 2001, 'A': means from VLA A-array data and 'u.l.': means that the core has not been detected and we have assumed an upper limit of 1.4mJy. Note (4): Total data: B means VLA B-array data NVSS means from the NVSS data (m = multiple source); -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) James Marcout, Patricia Vannier [CDS] 07-May-2004