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J/ApJ/706/1253         MOJAVE VII. Blazar jet acceleration        (Homan+, 2009)

MOJAVE: Monitoring Of Jets in Active Galactic Nuclei with VLBA Experiments. VII. Blazar jet acceleration. Homan D.C., Kadler M., Kellermann K.I., Kovalev Y.Y., Lister M.L., Ros E., Savolainen T., Zensus J.A. <Astrophys. J., 706, 1253-1268 (2009)> =2009ApJ...706.1253H
ADC_Keywords: Active gal. nuclei ; Radio continuum ; Surveys ; BL Lac objects ; QSOs ; Radio sources Keywords: BL Lacertae objects: general - galaxies: active - galaxies: jets - quasars: general - radio continuum: galaxies - surveys Abstract: We discuss acceleration measurements for a large sample of extragalactic radio jets from the Monitoring Of Jets in Active Galactic Nuclei with VLBA Experiments (MOJAVE) program, which studies the parsec-scale jet structure and kinematics of a complete, flux-density-limited sample of active galactic nuclei (AGNs). Accelerations are measured from the apparent motion of individual jet features or "components" which may represent patterns in the jet flow. We find that significant accelerations are common both parallel and perpendicular to the observed component velocities. Description: Here, we report the results of the first large-scale study of accelerations in the apparent motions of blazar jets. We examine accelerations both parallel and perpendicular to the apparent component velocities, representing changes in apparent speed and direction, respectively, and we analyze these acceleration measurements for 203 of the best-determined jet component motions from the MOJAVE program (Lister & Homan 2005, Cat. J/AJ/130/1389; Lister et al. 2009, Cat. J/AJ/137/3718). This work is an extension of our kinematical analysis of the MOJAVE I sample (Lister et al. 2009, Cat. J/AJ/138/1874). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file agn.dat 44 64 Positions for AGN sources table1.dat 121 203 Components for acceleration and non-radial motion analysis
See also: J/A+A/545/A113 : MOJAVE IX. Core shift effects (Pushkarev+, 2012) J/ApJ/722/L7 : Fermi/LAT detected MOJAVE AGNs (Pushkarev+, 2010) J/ApJ/710/764 : Extended radio emission in MOJAVE blazars (Kharb+, 2010) J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009) J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009) J/ApJS/171/376 : MOJAVE. III. VLA 1.4GHz images (Cooper+, 2007) J/AJ/133/2357 : Relativistic jets in the RRFID database (Piner+, 2007) J/AJ/131/1262 : AGN jets circular polarization images at 15GHz (Homan+, 2006) J/AJ/130/1389 : Linear polarization of AGN jets at 15GHz (Lister+, 2005) J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005) J/A+A/435/521 : Radio Sources in Low-Luminosity AGNs. IV (Nagar+, 2005) J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004) J/A+A/381/757 : List of extra-galactic radio jets (Liu+, 2002) Byte-by-byte Description of file: agn.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [QSO B] 6- 13 A8 --- QSO Source designation (HHMM+DDd, B1950) 15- 16 I2 h RAh SIMBAD hour of right ascension (J2000) 18- 19 I2 min RAm SIMBAD minute of right ascension (J2000) 21- 24 F4.1 s RAs SIMBAD second of right ascension (J2000) 26 A1 --- DE- SIMBAD sign of declination (J2000) 27- 28 I2 deg DEd SIMBAD degree of declination (J2000) 30- 31 I2 arcmin DEm SIMBAD arcminute of declination (J2000) 33- 34 I2 arcsec DEs SIMBAD arcsecond of declination (J2000) 37- 44 A8 --- OName Other designation
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- QSO Source designation (HHMM+DDd, B1950) 10- 17 A8 --- OName Other designation 19- 20 I2 --- Seq Component number 22- 23 I2 --- N Number of epochs 25- 29 F5.2 mas <R> Mean radial separation from core (averaged over all epochs) 31- 36 F6.1 deg PA [-179,180] Mean structural position angle 38- 43 F6.2 pc dProj Mean projected radial distance 45- 48 I4 mas/yr pm Angular proper motion 50- 52 I3 mas/yr e_pm pm uncertainty 54- 57 F4.1 --- beta Apparent speed in units of the speed of light 59- 61 F3.1 --- e_beta beta uncertainty 63- 68 F6.1 deg phi [-180,180] Proper motion position angle φ 70- 72 F3.1 deg e_phi Phi uncertainty 74- 77 F4.1 --- Diff Absolute difference between mean structural position angle and proper motion position angle 79- 81 F3.1 --- e_Diff Diff uncertainty 83- 86 I4 mas/yr2 dmu Angular acceleration parallel to the proper motion position angle 88- 90 I3 mas/yr2 e_dmu dmu uncertainty 92- 95 I4 mas/yr2 dmup Angular acceleration perpendicular to the proper motion position angle 97- 99 I3 mas/yr2 e_dmup mup uncertainty 101-105 F5.2 --- etaPa Relative parallel acceleration as defined in Section 3.3 107-110 F4.2 --- e_etaPa etaPa uncertainty 112-116 F5.2 --- etaPe Relative perpendicular acceleration as defined in Section 3.3. 118-121 F4.2 --- e_etaPe etaPe uncertainty
History: From electronic version of the journal References: Lister et al. Paper I 2005AJ....130.1389L Cat. J/AJ/130/1389 Homan et al. Paper II 2006AJ....131.1262H Cat. J/AJ/131/1262 Cooper et al. Paper III 2007ApJS..171..376C Cat. J/ApJS/171/376 Cara et al. Paper IV 2008ApJ...674..111C Lister et al. Paper V 2009AJ....137.3718L Cat. J/AJ/137/3718 Lister et al. Paper VI 2009AJ....138.1874L Cat. J/AJ/138/1874 Hovatta et al. Paper VIII 2012AJ....144..105H Cat. J/AJ/144/105 Pushkarev et al. Paper IX 2012A&A...545A.113P Cat. J/A+A/545/A113 Lister et al. Paper X 2013AJ....146..120L Cat. J/AJ/146/120 Hovatta et al. Paper XI 2014AJ....147..143H Cat. J/AJ/147/143 Homan et al., Paper XII 2015ApJ...798..134H, Cat. J/ApJ/798/134 Lister et al., Paper XIII 2016AJ....152...12L, Cat. J/AJ/152/12
(End) Emmanuelle Perret [CDS] 14-Dec-2011
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