J/ApJS/260/4 AGN jet directions from 1.4-86GHz VLBI obs. (Plavin+, 2022)
Direction of parsec-scale jets for 9220 active galactic nuclei.
Plavin A.V., Kovalev Y.Y., Pushkarev A.B.
<Astrophys. J. Suppl. Ser., 260, 4 (2022)>
=2022ApJS..260....4P 2022ApJS..260....4P
ADC_Keywords: Active gal. nuclei; Radio sources; Interferometry
Keywords: Active galactic nuclei ; Radio jets ;
Very long baseline interferometry ; Radio cores
Abstract:
The direction of parsec-scale jets in active galactic nuclei (AGNs) is
essential information for many astrophysical and astrometric studies,
including linear polarization and magnetic field structure, frequency-
dependent synchrotron opacity, proper motion, and reference-frame
alignment. We developed a rigorous, simple, and completely automated
method to measure the directions from calibrated interferometric
visibility data at frequencies ranging from 1.4 to 86GHz. We publish
the results for 9220 AGNs with the typical accuracy below 10°. An
internal check of the method comparing the directions between
different observing frequencies as well as with previous publications
verifies the robustness of the measured values.
Description:
For our analysis, we use VLBI observations at frequencies ranging from
1.4 to 86GHz compiled in the Astrogeo database
(http://astrogeo.org/vlbi_images/), a collection from 2021-July.
The full data set used for our analysis contains 17478 sources
observed from 1994 to 2021, 123456 single frequency images in total.
Out of those AGNs, 4671 were observed at least five times, and 14735
at two or more frequency bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 16510 Measurements of the AGN jet directions separately
for each frequency band
table2.dat 60 9220 Frequency-averaged directions of parsec-scale jets
with a single value for each AGN
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See also:
J/ApJS/141/13 : VLBA calibrator survey: VCS1 catalog (Beasley+, 2002)
J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003)
J/AJ/130/2473 : Fine-scale structure at 15GHz (Kovalev+, 2005)
J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)
J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006)
J/A+A/476/L17 : 86 and 43GHz observations of NRAO 150 (Agudo+, 2007)
J/ApJ/658/203 : VLBA imaging & polarimetry survey at 5GHz (Helmboldt+, 2007)
J/AJ/133/1236 : Fifth VLBA calibrator survey: VCS5 (Kovalev+, 2007)
J/AJ/136/159 : 86GHz VLBI survey of compact radio sources (Lee+, 2008)
J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)
J/AJ/142/105 : Optically Bright Extragalactic Radio Sources (Petrov+, 2011)
J/AJ/142/35 : The VLBA Galactic Plane Survey (VGaPS) (Petrov+, 2011)
J/MNRAS/414/2528 : LBA Calibrator Survey (LCS1) (Petrov+, 2011)
J/A+A/529/A91 : Proper motions of 555 quasars from VLBI (Titov+, 2011)
J/ApJ/747/63 : 7mm VLBA observations of BL Lac object OJ287 (Agudo+, 2012)
J/MNRAS/419/1097 : The EVN Galactic Plane Survey - EGaPS (Petrov, 2012)
J/ApJ/758/84 : Relativistic jets in RRFID database. II. 10yr (Piner+, 2012)
J/A+A/545/A113 : MOJAVE IX. Core shift effects (Pushkarev+, 2012)
J/A+A/544/A34 : Bright AGN VLBI imaging study at 2 & 8GHz (Pushkarev+, 2012)
J/MNRAS/421/1861 : OJ287 polarization and VLBI jet direction (Valtonen+, 2012)
J/AJ/146/120 : MOJAVE. X. Parsec-scale kinematics of AGNs (Lister+, 2013)
J/AJ/146/5 : Opt. Bright extragalactic Radio Sources II (Petrov, 2013)
J/AJ/147/143 : MOJAVE. XI. Spectral distributions (Hovatta+, 2014)
J/MNRAS/452/4274 : Angular sizes of AGN cores at 2-43GHz (Pushkarev+, 2015)
J/ApJS/217/4 : 2FGL sources observed between 5-9GHz (Schinzel+, 2015)
J/ApJ/846/98 : Jets of blazars at 43GHz with VLBA (Jorstad+, 2017)
J/MNRAS/468/4992 : MOJAVE XIV. AGN jet shapes (Pushkarev+, 2017)
J/ApJS/230/13 : VLBI Ecliptic Plane Survey: VEPS-1 (Shu+, 2017)
J/ApJS/234/12 : MOJAVE XV. VLBA 15GHz obs. of AGN jets (Lister+, 2018)
J/ApJ/874/43 : MOJAVE. XVII. Parsec-scale jets of AGNs (Lister+, 2019)
J/A+A/622/A92 : Ultracompact extragal. radio sources at 86GHz (Nair+, 2019)
J/MNRAS/485/1822 : AGN core shift measurements (Plavin+, 2019)
J/ApJS/242/5 : 40yr of VLBI obs. of ICRF sources (Xu+, 2019)
J/A+A/644/A159 : The third realization of the ICRF, ICRF3 (Charlot+, 2020)
J/MNRAS/493/L54 : Optical polarization properties of AGNs (Kovalev+, 2020)
J/A+A/651/A64 : Position difference vectors and of the jets (Lambert+, 2021)
J/AJ/161/14 : The Wide-field VLBA Calibrator Survey (WFCS) (Petrov, 2021)
http://astrogeo.org/vlbi_images/ : The Astrogeo VLBI FITS image database
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Source name (G1)
12- 15 F4.1 GHz Freq [1.4/86] Frequency band
17- 19 I3 --- Nep [1/199] Number of VLBI contributing epochs
21- 24 I4 deg PA [-180/180] Jet position angle
26- 28 I3 deg e_PA [0/175]? Uncertainty in PosAng
30- 33 A4 --- n_PA Error type for PA (1)
35- 37 A3 --- Corr The 180 degree correction flag (2)
39- 46 F8.1 mas Median [0.1/170056] Median core to jet distance (G2)
48- 54 F7.1 mas MAD [0.1/11076]? Median absolute deviation core
to jet distance (G3)
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Note (1): Error type as follows:
STD = intra-band standard deviation if Nep≥5;
ASTD = average standard deviation at this band for
frequencies below 86GHz, and none for 86GHz.
Note (2): Based on the orientation that we measure at a higher frequency
of νGHz ("Fν") or based on dedicated studies of specific
objects, J0900-2808 in Kosogorov+ (2022MNRAS.510.1480K 2022MNRAS.510.1480K ; "E1") and
J0927+3902 in Alberdi+ (1993ApJ...402..160A 1993ApJ...402..160A ; "E2").
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Source name (G1)
12- 32 A21 GHz Freq Frequency of the band(s)
34- 37 I4 deg PA [-180/180] Jest position angle
39- 41 I3 deg e_PA [1/149] Uncertainty in PA
43- 44 A2 --- Corr The 180 degree correction flag (1)
46- 52 F7.1 mas Median [0.2/85029] Median core to jet distance (G2)
54- 60 F7.1 mas MAD [0.1/85028]? Median absolute deviation core
to jet distance (G3)
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Note (1): Based on dedicated studies of specific objects,
J0900-2808 in Kosogorov+ (2022MNRAS.510.1480K 2022MNRAS.510.1480K ; "E1") and
J0927+3902 in Alberdi+ (1993ApJ...402..160A 1993ApJ...402..160A ; "E2").
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Global notes:
Note (G1): In the RFC catalog http://astrogeo.org/rfc/
Note (G2): Indicating angular scales probed by this measurement.
Note (G3): When at least two epochs are available.
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Acknowledgements:
Alexander Plavin [alexander at plav.in]
History:
From electronic version of the journal
Coordinates from http://astrogeo.org/sol/rfc/rfc_2022a/rfc_2022a_cat.txt ;
http://astrogeo.org/vlbi_images/ or sent by the author (extracted from the
VLBI visibility files).
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Jul-2022