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J/AJ/130/2473     Fine-scale structure in 250 sources at 15GHz  (Kovalev+, 2005)

Sub-milliarcsecond imaging of quasars and active galactic nuclei. IV. Fine-scale structure. Kovalev Y.Y., Kellermann K.I., Lister M.L., Homan D.C., Vermeulen R.C., Cohen M.H., Ros E., Kadler M., Lobanov A.P., Zensus J.A., Kardashev N.S., Gurvits L.I., Aller M.F., Aller H.D. <Astron. J., 130, 2473-2505 (2005)> =2005AJ....130.2473K
ADC_Keywords: BL Lac objects ; Active gal. nuclei ; Radio continuum ; QSOs ; Galaxies, radio Keywords: BL Lacertae objects: general - galaxies: active - galaxies: jets - quasars: general - radio continuum: galaxies - surveys Abstract: We have examined the compact structure in 250 flat-spectrum extragalactic radio sources using interferometric fringe visibilities obtained with the Very Long Baseline Array (VLBA) at 15GHz. With projected baselines out to 440Mλ, we are able to investigate source structure on typical angular scales as small as 0.05mas. Description: Our analysis is based on data obtained during the period 1994-2003 as part of the VLBA 15 GHz monitoring survey of extragalactic sources (Kellerman et al. 1998AJ....115.1295K, Zensus et al. 2002AJ....124..662Z, Kellerman et al. Cat. J/ApJ/609/539, Lister & Homan Cat. J/AJ/130/1389, E. Ros et al. 2006, in prep.). We have also used additional observations made in 1998 and 1999 by L.I. Gurvits et al. (2006, in prep.) as part of a separate program to compare 15GHz source structure measured with the VLBA to 5GHz structure measured in the framework of the VSOP survey program. Our data set consists of 1204 VLBA observations of 250 different compact extragalactic radio sources. The initial calibration of the data was carried out with the NRAO AIPS package and was followed by imaging with the DIFMAP program, mostly with the use of an automatic script. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 97 250 General source properties table2.dat 85 1204 Source parameters for all epochs of observations at 15GHz
See also: J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004) J/AJ/130/1389 : Linear polarization images at 15GHz of AGN jets (Lister+, 2005) J/ApJ/616/110 : VSOP 5GHz AGN Survey. IV (Horiuchi+, 2004) J/ApJ/609/564 : Blazar counterparts for 3EG sources (Sowards-Emmerd+, 2004) J/ApJ/590/109 : Gamma-ray blazar in northern sky (Sowards-Emmerd+, 2003) J/ApJS/135/155 : Radio identification of 3EG EGRET sources (Mattox+, 2001) J/A+AS/105/211 : Optical identification status of 1Jy catalogue (Stickel+ 1994) J/A+A/386/97 : The Parkes quarter-Jansky flat-spectrum sample (Jackson+, 2002) J/ApJS/150/181 : Redshifts of 110 radio-loud AGNs (Eracleous+, 2004) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- IAU The IAU (B1950.0) name 10- 18 A9 --- Alias Object alias 20- 21 I2 h RAh Hour of Right Ascension (J2000) 23- 24 I2 min RAm Minute of Right Ascension (J2000) 26- 32 F7.4 s RAs Second of Right Ascension (J2000) 34 A1 --- DE- Sign of the Declination (J2000) 35- 36 I2 deg DEd Degree of Declination (J2000) 38- 39 I2 arcmin DEm Arcminute of Declination (J2000) 41- 47 F7.4 arcsec DEs Arcsecond of Declination (J2000) 49 A1 --- cl [QBGU] Optical classification (1) 51 A1 --- f_cl Discordant classifications (2) 53 A1 --- l_z [>] Limit flag on z 55- 59 F5.3 --- z ? Redshift (3) 61- 66 A6 --- Rsp Radio spectrum: flat, peaked or steep (4) 68- 69 A2 --- EGRET [YNP] EGRET identification (5) 71 A1 --- MOJAVE [YN] Included in the program (Monitoring of Jets in AGN with VLBA Experiments) 73- 77 A5 --- VSOP VSOP 5GHz AGN member (6) 79- 97 A19 --- IDV Fast variations references (7)
Note (1): According to the Veron-Cetty & Veron (2003, Cat. VII/248) catalog except for 0108+388, 0742+103, and 2128+048. There classification is from Carilli et al. (1998ApJ...494..175C), Best et al. (2003MNRAS.346.1021B), and Biretta et al (1985AJ.....90.2508B), respectively. The optical classification is defined as follows: Q = quasar; B = BL Lac object; G = active galaxy; U = unidentified. Note (2): Flag on classification, defined as follows: a = Source classified as quasar in the Veron-Cetty & Veron catalog (2003, Cat. VII/248). b = Source classified as a probable or possible BL Lac object in the Veron-Cetty & Veron catalog (2003, Cat. VII/248). c = Source classified as galaxy in the Veron-Cetty & Veron catalog (2003, Cat. VII/248). Note (3): From Veron-Cetty & Veron (2003, Cat. VII/248). The redshift of 0108+388 is from Carilli et al (1998ApJ, 494, 175), that of 0138-097 is from Stocke & Rector (1997ApJ...489L..17S), that of 0333+321 is from Small et al. (1997AJ....114.2254S), that of 0415+379 is from Eracleous & Halpern (2004, Cat. J/ApJS/150/181), that of 0742+103 is from Best et al. (2003MNRAS.346.1021B), that of 0808+019 is from Jackson et al. (2002, Cat. J/A+A/386/97) as a tentative value, that of 1519-273 is from Heidt et al. (2004A&A...418..813H), and that of 2128+048 is from Stickel et al. (1994, Cat. J/A+AS/105/211). Note (4): We consider a radio spectrum to be flat if any portion of its spectrum in the range 0.6-22GHz has a spectral index flatter than -0.5 and steep if the radio spectral index is steeper than -0.5 over this entire region. Note (5): According to Mattox et al. (2001, Cat. J/ApJS/135/155) (first letter) and Sowards-Emmerd et al. (2003, Cat. J/ApJ/590/109), Sowards-Emmerd et al. (2004, Cat. J/ApJ/609/564) (second letter), where: Y = highly probable identification, P = probable identification, N = no identification; 1652+398 and 2255-282 are not identified in Mattox et al. (2001, Cat. J/ApJS/135/155), Sowards-Emmerd et al. (2003, Cat. J/ApJ/590/109), Sowards-Emmerd et al. (2004, Cat. J/ApJ/609/564), the highly probable EGRET identifications are from Kataoka et al. (1999ApJ...514..138K) and Bertsch (1998IAUC.6807....2B), Macomb et al. (1999ApJ...513..652M), Tornikoski et al. (1999AJ....118.1161T), respectively. Note (6): Member of VSOP (VLBI Space Observatory Programme) 5GHz AGN, defined as follows: A = VSOP AGN survey sample observed with VSOP; B = VSOP AGN survey sample not yet observed with VSOP; C = VSOP AGN survey sample being too faint to be observed with VSOP (Horiuchi et al. (2004, Cat. J/ApJ/616/110) have analyzed sample members A and C; in the latter case, 5 GHz VLBA data only were used); PR = Pearson-Readhead VSOP survey sample Lister et al. (2001ApJ...562..208L). Note (7): Paper reporting on fast variations from the source on the time scale less than 2-3 days. The reference number followed by "(b)" if the modulation index m>0.02 is reported in the paper. 1 = Quirrenbach et al. (1992A&A...258..279Q); 2 = Quirrenbach et al. (2000A&AS..141..221Q); 3 = Kedziora-Chudczer et al. (2001, Cat. J/MNRAS/325/1411); 4 = Kraus et al. (2003A&A...401..161K); 5 = Lovell et al. (2003ApJS..155...27L); 6 = Ojha et al. (2004, Cat. J/ApJ/614/607); 7 = Bignall et al. (2002PASA...19...29B).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- IAU The IAU (B1950.0) name 10- 19 A10 "YYYY/MM/DD" ObsDate Date of observation 21- 25 F5.2 Jy Stot Filled-aperture (single antenna) flux density 27- 31 F5.2 Jy Sclean Total CLEAN flux density of a VLBA map 33- 37 F5.2 Jy Sunres ? Flux density from the most compact component of a VLBA map 39- 43 F5.2 Jy Score ? Flux density for a VLBA core component in a model 45 A1 --- l_MajAxis Limit flag on MajAxis 46- 49 F4.2 mas MajAxis ? FWHM major axis of a VLBA core component 51 A1 --- l_MinAxis Limit flag on MinAxis 52- 55 F4.2 mas MinAxis ? FWHM minor axis for a VLBA core component 57- 59 I3 deg PA [-90/90]? Position angle of the major axis of a VLBA core component 61 A1 --- l_Tb Limit flag on Tb 62- 69 E8.2 K Tb ? Brightness temperature of VLBA core component 71- 74 E4.2 --- Comp ? Median value of SVLBA/Stot over all available epochs (compactness at arcsecond scales) 76- 79 I4 deg PAjet ? Position angle of the jet defined from multi-epoch observations 81- 82 I2 --- Nobs ? Number of epochs of observations 84- 85 I2 --- Nep ? Number of epochs when source VLBA core component is unresolved at least in one direction
History: From electronic version of the journal References: Kellerman et al., Paper I 1998AJ....115.1295K Zensus et al, Paper II 2002AJ....124..662Z Kellerman et al., Paper III 2004ApJ...609..539K, Cat. J/ApJ/609/539
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 11-Apr-2006
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