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J/ApJS/98/1 First Caltech-Jodrell Bank VLBI Survey. I. (Polatidis+ 1995) ================================================================================ The First Caltech-Jodrell Bank VLBI survey. I. Lambda = 18 centimeter observations of 87 sources Polatidis A.G., Wilkinson P.N., Xu W., Readhead A.C.S., Pearson T.J., Taylor G.B., Vermeulen R.C.=1995ApJS...98....1P ================================================================================ ADC_Keywords: VLBI ; QSOs ; Radio sources Keywords: quasars: general - radio continuum: galaxies - surveys - techniques: interferometric Abstract: We present the first results from the first Caltech-Jodrell Bank VLBI survey (the CJ1 survey). The CJ1 sample includes 135 radio sources with total flux density 1.3Jy>S_6cm>=0.7Jy, declination delta_1950>=35deg, and Galactic latitude |b^II|>10deg. It extends the flux density limit of the complete "PR" sample studied by Pearson & Readhead from 1.3 to 0.7Jy and increases the total number of sources from 65 to 200. The complete survey includes VLBI images at both lambda-18 and 6cm of all objects in the extended sample that have cores strong enough to be mapped with the Mark II VLBI system. These images provide a large enough sample to study, for example, the variety of morphologies exhibited by compact radio sources, cosmological evolution, superluminal motion, and misalignment between parsec-scale and kiloparsec-scale radio structures. In this paper we present lambda-18cm VLBI observations of 56 CJ1 and 31 PR sources made in 1990-1991, including images of 82 sources. The observations were made with a "snapshot" technique in which each source was observed in three 20-30-minute scans using an array of 12-16 antennas. The images have resolution 3-10mas and dynamic range greater than 100:1. Later papers in the series will present the remaining lambda-18cm observations, the lambda-6cm observations, and the analysis and interpretation of the results. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 89 135 The complete CJ1 sample table2.dat 84 31 Sources from the PR sample observed at 18 cm table4.dat 74 82 Map parameters table5 53 236 Gaussian models fig/* . 165 Maps -------------------------------------------------------------------------------- See also: J/ApJS/98/33 : First Caltech-Jodrell Bank VLBI Survey. II (Thakkar+ 1995) J/ApJS/99/297 : First Caltech-Jodrell Bank VLBI Survey. III (Xu+ 1995) J/ApJS/95/345 : Second Caltech-Jodrell Bank VLBI Survey. I. (Taylor+ 1994) J/ApJS/100/1 : Second Caltech-Jodrell Bank VLBI Survey. II (Henstock+ 1995) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name according to IAU convention 10- 11 I2 h RAh Right ascension, J2000.0 13- 14 I2 min RAm Right ascension, J2000.0 16- 21 F6.3 s RAs Right ascension, J2000.0 25- 26 I2 deg DEd Declination, J2000.0 28- 29 I2 arcmin DEm Declination, J2000.0 31- 35 F5.2 arcsec DEs *Declination, J2000.0 46- 49 F4.2 Jy S11cm *Total flux density at 11 cm 52- 55 F4.2 Jy S6cm *Total flux density at 6 cm 58- 61 F4.2 Jy S2.8cm *Total flux density at 2.8 cm 63- 64 A2 --- ID *Optical identification 66- 69 F4.1 mag V ? Apparent V magnitude 70 A1 --- n_z [f>] 'f' - featureless spectrum, '>' - limit 71- 76 F6.4 --- z *? Redshift 78- 81 I4 yr OBSy ? Date of VLBI observations (year) 83- 84 I2 --- OBSm ? Date of VLBI observations (month) 85- 86 A2 --- n_OBSy *Notes on observation date 88- 89 I2 --- r_OBS *[1/18]? Reference to published observation -------------------------------------------------------------------------------- Note on DEs: Positions specified with a precision of 0.01" are from the Jodrell Bank- VLA Astrometric Survey (Patnaik et al. 1992MNRAS.254..655P, Tables 2 and 4; and unpublished observations); the remaining positions have been compiled from a variety of publications via the NASA Extragalactic Database (NED). Note on S11cm: Total flux density at 11cm from Pauliny-Toth et al. 1978AJ.....83..451P Note on S6cm: Total flux density at 6cm from Kuhr et al. 1981AJ.....86..854K Note on S2.8cm: Total flux density at 3.6cm from Kuhr et al. 1981AJ.....86..854K Note on ID: Optical identification: BL - BL Lac object; EF - Empty Field; G - Galaxy; Q - Quasar; SO - Stellar object. Note on z: See notes to Table 1 in the printed paper for references. Note on n_OBSy: Parentheses indicate that the source was observed but not mapped; in three cases (marked with an asterisk) this is because the a priori position assumed for correlations was wrong, while in the other cases the source was too heavily resolved. A blank field indicates that the source was not observed because it does not contain a compact component strong enough for detection with Mark-II VLBI. Note to r_OBS: 1: Xu et al. 1994AJ....108..395X 2: Stickel & Khuer 1994 3: Stickel, Meisenheimer & Khuer 1994 < 4: Spinrad et al. 1985 5: Browne et al. 1993MNRAS.263L..32B 6: Henstock, Browne & Wilkinson 1995 7: Jackson 1989 (Ph.D. thesis, Univ. of Manchester) 8: Palomar Observatory Sky Survey 9: Hewitt & Burbidge 1993 10: Eckart et al. 1987A&AS...67..121E 11: Sanghera 1992 (Ph.D. thesis, Univ. of Manchester) 12: Fanti et al. 1985A&A...143..292F 13: Dallacasa et al. 1995A&A...295...27D 14: Foulsham 1989 (M.Sc. thesis, Univ. of Manchester) 15: Jones et al. 1986ApJ...305..684J 16: Dallacasa et al. 1990 (in Compact Steep-Spectrum and GHz-peaked Spectrum Radio Sources, ed. C. Fanti, D. Fanti. C.P. O'Dea & R.T. Schilizzi, Bologna: Consiglio Nazionale delle Ricerche, 77 17: Sanghera 1989 (M.Sc. thesis, Univ. of Manchester) 18: Lawrence, Zucker, Readhead, Unwin, Pearson & Xu, 1995, ApJS, submitted -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name according to IAU convention 10- 11 I2 h RAh Right ascension, J2000.0 13- 14 I2 min RAm Right ascension, J2000.0 16- 21 F6.3 s RAs Right ascension, J2000.0 25- 26 I2 deg DEd Declination, J2000.0 28- 29 I2 arcmin DEm Declination, J2000.0 31- 35 F5.2 arcsec DEs *Declination, J2000.0 45- 49 F5.2 Jy S11cm *Total flux density at 11 cm 52- 55 F4.2 Jy S6cm *Total flux density at 6 cm 57- 61 F5.2 Jy S2.8cm *? Total flux density at 2.8 cm 63- 64 A2 --- ID *Optical identification 66- 69 F4.1 mag Vmag ? Apparent V magnitude 71- 76 F6.4 --- z *? Redshift from Lawrence et al. 78- 81 I4 yr OBSy Date of VLBI observations (year) 83- 84 I2 --- OBSm Date of VLBI observations (month) -------------------------------------------------------------------------------- Note on DEs: Positions specified with a precision of 0.01" are from the Jodrell Bank- VLA Astrometric Survey (Patnaik et al. 1992MNRAS.254..655P, Tables 2 and 4; and unpublished observations); the remaining positions have been compiled from a variety of publications via the NASA Extragalactic Database (NED). Note on S11cm: Total flux density at 11cm from Pauliny-Toth et al. 1978AJ.....83..451P Note on S6cm: Total flux density at 6cm from Kuhr et al. 1981AJ.....86..854K Note on S2.8cm: Total flux density at 3.6cm from Kuhr et al. 1981AJ.....86..854K Note on ID: Optical identification: BL - BL Lac object; G - Galaxy; Q - Quasar Note on z: Lawrence, Zucker, Readhead, Unwin, Pearson & Xu, 1995, ApJS, submitted -------------------------------------------------------------------------------- Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name according to IAU convention 10- 13 I4 yr OBSy Date of VLBI observation (year) 15- 16 I2 --- OBSm Date of VLBI observation (month) 18- 20 A3 --- Samp VLBI sample (CJ1 or PR) source belongs to 22- 26 F5.2 mas a18cmn FWHM of major axis of the restoring beam 28- 32 F5.2 mas b18cmn FWHM of minor axis of the restoring beam 35- 37 I3 deg PA18cmn [-83/88] Position angle of major axis, north through east 39- 42 I4 mJy S18cmn *Peak flux density, naturally weighted map 44- 47 F4.2 mJy e_S18cmn *Off source rms, naturally weighted map 49- 53 F5.2 mas a18cmt ? FWHM of major axis of tapered map restoring beam 55- 59 F5.2 mas b18cmt ? FWHM of minor axis of tapered map restoring beam 62- 64 I3 deg PA18cmt [-75/70]? Position angle of major axis, N through E 66- 69 I4 mJy S18cmt *? Peak flux density, tapered map 71- 74 F4.2 mJy e_S18cmt *? Off source rms, tapered map -------------------------------------------------------------------------------- Note on S18cmn, e_S18cmn, S18cmt, e_S18cmt: Data are in mJy/beam -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name according to IAU convention 10- 14 F5.3 Jy S Flux density of component 16- 21 F6.2 mas Rad *Radius of component 23- 28 F6.1 deg Theta *Angle to component 30- 35 F6.2 mas a FWHM of major axis of component 37- 40 F4.2 --- b/a Axial ratio of major to minor axis, b/a 42- 47 F6.1 deg Phi Position angle of major axis, north through east 49- 53 F5.3 --- Chi2 ? Chi-squared between the model and the self-calibrated UV-data -------------------------------------------------------------------------------- Note on Rad: Radius of component, measured from position of first component Note on Theta: Angle to component, measured north through east from the position of the first component -------------------------------------------------------------------------------- Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 10-May-95 ================================================================================ (End) [CDS] 14-Oct-1996 J/ApJS/98/33 First Caltech-Jodrell Bank VLBI Survey. II. (Thakkar+ 1995) ================================================================================ The First Caltech-Jodrell Bank VLBI Survey. II. Lambda = 18 Centimeter Observations of 25 Sources Thakkar D.D., Xu W., Readhead A.C.S., Pearson T.J., Taylor G.B., Vermeulen R.C., Polatidis A.G., Wilkinson P.N. =1995ApJS...98...33T ================================================================================ ADC_Keywords: VLBI ; QSOs ; Radio sources Keywords: quasars: general - radio continuum: galaxies - surveys - techniques: interferometric Abstract: We report lambda-18 cm VLBI observations made in 1991 September of a further 25 objects from the first Caltech-Jodrell Bank VLBI Survey (the CJ1 survey). The CJ1 sample is a complete, flux-density limited sample of 135 radio sources with total flux density at lambda-6cm between 0.7 and 1.3Jy. These observations complete the lambda-18cm part of the survey. Together with the results of Paper I (Polatidis et al., ), we have now observed 81 CJ1 sources at lambda-18cm. Later papers in the series will present lambda-6cm observations and the analysis and interpretation of the results. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 74 24 Map parameters table3 53 44 Gaussian models fig/* . 51 Maps -------------------------------------------------------------------------------- See also: J/ApJS/98/1 : First Caltech-Jodrell Bank VLBI Survey. I (Polatidis+ 1995) J/ApJS/99/297 : First Caltech-Jodrell Bank VLBI Survey. III (Xu+ 1995) J/ApJS/95/345 : Second Caltech-Jodrell Bank VLBI Survey. I. (Taylor+ 1994) J/ApJS/100/1 : Second Caltech-Jodrell Bank VLBI Survey. II (Henstock+ 1995) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name according to IAU convention 10- 13 I4 yr OBSy Date of VLBI observation (year) 15- 16 I2 --- OBSm Date of VLBI observation (year) 18- 20 A3 --- Samp VLBI sample (CJ1 or PR) source belongs to 22- 26 F5.2 mas a18cmn FWHM of major axis of the restoring beam 28- 32 F5.2 mas b18cmn FWHM of minor axis of the restoring beam 34- 37 I4 deg PA18cmn [-89/32] Position angle of major axis, north through east 39- 42 I4 mJy S18cmn *Peak flux density, naturally weighted map 44- 47 F4.2 mJy e_S18cmn *Off source rms, naturally weighted map 49- 53 F5.2 mas a18cmt FWHM of major axis of tapered map restoring beam 55- 59 F5.2 mas b18cmt FWHM of minor axis of tapered map restoring beam 61- 64 I4 deg PA18cmt [-60/72] Position angle of major axis, N through E 66- 69 I4 mJy S18cmt *Peak flux density, tapered map 71- 74 F4.2 mJy e_S18cmt *Off source rms, tapered map -------------------------------------------------------------------------------- Note on S18cmn, e_S18cmn, S18cmt, e_S18cmt: Data are in mJy/beam -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name according to IAU convention 9- 14 F6.3 Jy S Flux density of component 15- 21 F7.2 mas Rad *Radius of component 22- 28 F7.1 deg Theta *Angle to component 29- 35 F7.2 mas a FWHM of major axis of component 36- 40 F5.2 --- b/a Axial ratio of major to minor axis, b/a 41- 47 F7.1 deg Phi Position angle of major axis, north through east 48- 53 F6.3 --- Chi2 []? Chi-squared between the model and the self-calibrated UV-data -------------------------------------------------------------------------------- Note on Rad: Radius of component, measured from position of first component Note on Theta: Angle to component, measured north through east from the position of the first component -------------------------------------------------------------------------------- Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 10-May-95 ================================================================================ (End) [CDS] 14-Oct-1996 J/ApJS/99/297 First Caltech-Jodrell Bank VLBI Survey. III (Xu+ 1995) ================================================================================ The First Caltech-Jodrell Bank VLBI Survey. III. VLBI and Merlin Observations at 5 GHz and VLA Observations at 1.4 GHz Xu W., Readhead A.C.S., Pearson T.J., Polatidis A.G., Wilkinson P.N. =1995ApJS...99..297X ================================================================================ ADC_Keywords: QSOs ; Radio sources ; VLBI Keywords: quasars: general - radio continuum: galaxies - surveys Abstract: We present the 5GHz results from the first Caltech-Jodrell Bank (CJ1) VLBI survey. The 1.6GHz maps were presented in two separate papers, Polatidis et al. and Thakkar et al. . These three papers complete the first stage of this program to map at both 1.6 and 5GHz all objects accessible to Mark II VLBI in the complete sample of 135 objects with 1.3>S(5Ghz)>=0.7Jy, Dec(1950)>=35deg, and |b|>10deg. The combination of the CJ1 sample with the Pearson-Readhead (PR) sample provides a complete, flux density-limited sample of 200 objects with S(5GHz)>=0.7Jy, Dec(1950)>=35deg, |b|>10deg for which all of the objects accessible to Mark II VLBI have been mapped at both 5GHz (129 objects) and 1.6GHz (132 objects). In addition to the 5GHz VLBI maps, we present in this paper 5GHz MERLIN observations of 20 objects and 1.4GHz VLA observations of 92 objects in the combined CJ1 + PR sample. The VLA maps, together with L-band (1.3-1.7GHz) maps available in the literature, provide a complete set of VLA maps for the combined CJ1 + PR sample. Finally, we present the radio spectra of the objects in the CJ1 sample. The combined CJ1 + PR VLBI surveys provide a sample which is large enough for a number of important astrophysical and cosmological studies. These will be presented in further papers in this series. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2 74 88 VLBI (5GHz) map parameters table3 64 293 Gaussian models table4.dat 49 23 MERLIN (5GHz) map parameters table5.dat 43 94 VLA (1.4GHz) map parameters -------------------------------------------------------------------------------- See also: J/ApJS/98/1 : First Caltech-Jodrell Bank VLBI Survey. I (Polatidis+ 1995) J/ApJS/98/33 : First Caltech-Jodrell Bank VLBI Survey. II (Thakkar+ 1995) J/ApJS/95/345 : Second Caltech-Jodrell Bank VLBI Survey. I. (Taylor+ 1994) J/ApJS/100/1 : Second Caltech-Jodrell Bank VLBI Survey. II (Henstock+ 1995) Byte-by-byte Description of file: table2 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name, IAU convention 10- 13 I4 yr OBSy Date of the VLBI observations (year) 15- 16 I2 --- OBSm Date of the VLBI observations (month) 18- 20 A3 --- Sample VLBI sample (CJ1 or PR) the source belongs to 22- 26 F5.2 mas a5GHzn []? FWHM of major axis of the restoring beam 28- 32 F5.2 mas b5GHzn []? FWHM of minor axis of the restoring beam 34- 37 I4 deg PA5GHzn []? Position angle of major axis, N through E 39- 42 I4 mJy S5GHzn []? Peak flux density, naturally weighted map 44- 47 F4.2 mJy e_S5GHzn []? Off source rms, naturally weighted map 49- 53 F5.2 mas a5GHzt []? FWHM of major axis of tapered map restoring beam 55- 59 F5.2 mas b5GHzt []? FWHM of minor axis of tapered map restoring beam 61- 64 I4 deg PA5GHzt []? Position angle of major axis, N through E 66- 69 I4 mJy S5GHzt []? Peak flux density, tapered map 71- 74 F4.2 mJy e_S5GHzt []? Off source rms, tapered map -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 B1950 source name according to IAU convention 10- 14 F5.3 Jy S Flux density of component 16- 21 F6.2 mas Rad *Radius of component 23- 28 F6.1 deg Theta *Angle to component 30- 34 F5.2 mas a FWHM of major axis of component 36- 39 F4.2 --- b/a Axial ratio of major to minor axis, b/a 41- 46 F6.1 deg Phi Position angle of major axis, north through east 48- 52 F5.3 --- Amp []? Amplitude agreement factor 54- 58 F5.3 --- CP []? Closure Phase agreement factor 60- 64 F5.3 --- Tot []? Total agreement factor -------------------------------------------------------------------------------- Note on Rad: Radius of component, measured from position of the first component Note on Theta: Angle to component measured north through east from the position of the first component -------------------------------------------------------------------------------- Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- CJ1 Source name 12- 14 A3 --- Sample Sample, CJ1 or PR 16- 22 F7.1 mas a Beam FWHM major axis 24- 29 F6.1 mas b Beam FWHM minor axis 31- 35 I5 deg Theta Beam major axis position angle 37- 42 I6 mJy S5GHz Peak intensity 44- 49 F6.2 mJy e_S5GHz rms noise -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- Source Source name 12- 14 A3 --- Sample Sample, CJ1 or PR 16- 23 F8.1 mJy S5GHz Peak intensity 25- 32 F8.2 mJy e_S5GHz rms noise 40- 43 A4 --- Struct *Structure -------------------------------------------------------------------------------- Note on Struct: Structure: U - unresolved E - extended structure detected E? - hint of extended structure Note flag: a Faint component ~ 12" to the north b Faint component ~ 1' to the west c Logarithmic contour levels in steps of 2^{1/2} d Convolved with 3" circular Gaussian beam e Convolved with 5" circular Gaussian beam f The lowest contour in 2 sigma g The lowest contour is 4 sigma h Source resolved at long baselines -------------------------------------------------------------------------------- Note: All the figures are available on the AAS CD-ROM, directories: /volume5/apjs/v99/p297/figure2 /volume5/apjs/v99/p297/figure4 /volume5/apjs/v99/p297/figure6 Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 29-Aug-95 ================================================================================ (End) [CDS] 02-Feb-1996