J/AJ/131/1262 Circular polarization images at 15GHz of AGN jets (Homan+, 2006)
MOJAVE: Monitoring of Jets in Active Galactic Nuclei with VLBA Experiments.
II. First-epoch 15GHz circular polarization results.
Homan D.C., Lister M.L.
<Astron. J., 131, 1262-1279 (2006)>
=2006AJ....131.1262H 2006AJ....131.1262H
ADC_Keywords: Radio sources ; BL Lac objects ; Active gal. nuclei ; QSOs ;
Polarization
Keywords: BL Lacertae objects: general - galaxies: active - galaxies: jets -
polarization - quasars: general - radio continuum: galaxies
Abstract:
We report first-epoch circular polarization results for 133 active
galactic nuclei in the MOJAVE (Monitoring of Jets in Active Galactic
Nuclei with VLBA Experiments) program to monitor the structure and
polarization of a flux-limited sample of extragalactic radio jets with
the VLBA at 15GHz. We found strong circular polarization (0.3%) in
approximately 15% of our sample. The circular polarization was usually
associated with jet cores; however, we did find a few strong jet
components to be circularly polarized.
Description:
Each MOJAVE observing session targets 18 sources over a 24hr period,
and this paper presents results drawn from the first 11 sessions, from
2002 May 31 through 2004 February 11. The data were recorded at each
VLBA antenna at a central observing frequency of 15.366GHz using 1bit
sampling and were correlated at the VLBA correlator in Socorro, New
Mexico.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 133 Circular polarization at Stokes I peak
table2.dat 61 8 Circular polarization on off-peak jet cores
table3.dat 61 35 Circular polarization on strong jet components
table5.dat 32 23 Comparison of core circular polarization at 5
and 15GHz
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See also:
VII/235 : Quasars and Active Galactic Nuclei (11th Ed.) (Veron+, 2003)
J/A+A/386/97 : Parkes quarter-Jansky flat-spectrum sample (Jackson+, 2002)
J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004)
VII/6 : Polarization of Extragalactic Radiosources (Eichendorf+ 1980)
J/A+A/332/410 : Quasar polarization (Hutsemekers 1998)
J/A+A/340/371 : Quasar polarization (Hutsemekers+ 1998)
J/A+AS/39/379 : Linear Polarization of radio sources (Tabara+ 1980)
J/A+AS/135/571 : Extragalactic radio sources polarization (Zukowski+, 1999)
J/AJ/130/1389 : AGN jets linear polarization images at 15GHz (Lister+, 2005)
J/ApJS/171/376 : MOJAVE. III. VLA 1.4GHz images (Cooper+, 2007)
J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)
J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009)
J/ApJ/706/1253 : MOJAVE VII. Blazar jet acceleration (Homan+, 2009)
J/ApJ/710/764 : Extended radio emission in MOJAVE blazars (Kharb+, 2010)
J/ApJ/722/L7 : Fermi/LAT detected MOJAVE AGNs (Pushkarev+, 2010)
J/A+A/545/A113 : MOJAVE IX. Core shift effects (Pushkarev+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name The B1950.0 IAU name
10- 18 A9 --- OName Other name
20- 26 F7.5 --- z ? Redshift (1)
28 A1 --- Ocl Optical Classification (2)
30- 39 A10 "YYYY/MM/DD" ObsDate Year of first MOJAVE observation
41- 45 F5.2 Jy IPeak Stokes I at the map peak in units of Jy/beam
47 A1 --- l_ml Limit flag on ml
48- 53 F6.2 % ml Fractional linear polarization of Stokes
I peak
55- 60 F6.2 mJy VPeak Maximum circular polarization measured
within 2 pixels of Stokes I peak
62- 65 F4.2 mJy e_VPeak Uncertainty in VPeak
67 A1 --- l_mc Limit flag on mc
68- 72 F5.2 % mc Fractional circular polarization
corresponding to VPeak
74- 77 F4.2 % e_mc ? Uncertainty in mc
79- 81 F3.1 --- sigma ? Significance of circular polarization
measurement (G1)
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Note (1): See Lister & Homan (2005, Cat. J/AJ/130/1389) for references.
Note (2): Optical classification, defined as follows:
Q = quasar;
B = BL Lac object;
G = active galaxy;
U = unidentified.
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name The B1950.0 IAU name
10- 13 F4.2 mas Rad Radial position (1)
15- 20 F6.1 deg theta Structural position angle (1)
22- 25 F4.2 Jy I Peak Stokes I of core/component in units
of Jy/beam (2)
27 A1 --- l_ml Limit flag on ml
28- 33 F6.2 % ml Fractional linear polarization of core/component
35- 40 F6.2 mJy V Maximum circular polarization measured within 2
pixels of core/component peak in units
of mJy/beam (2)
42- 45 F4.2 mJy e_V Uncertainty in V
47 A1 --- l_mc Limit flag on mc
48- 52 F5.2 % mc Fractional circular polarization corresponding
to V
54- 57 F4.2 % e_mc ? Uncertainty in mc
59- 61 F3.1 --- sigma ? Significance of circular polarization
measurement (G1)
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Note (1): Of core relative to map peak (table 2), or of component
relative to the jet core (table 3).
Note (2): At the location of the VLBI core (table 2) or jet component (table 3).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name The B1950.0 IAU Name
10 A1 --- l_mc5GHz Limit flag on mc15GHz
11- 15 F5.2 % mc5GHz Fractional circular polarization at 5GHz
17- 20 F4.2 % e_mc5GHz ? Error in mc5GHz
22 A1 --- l_mc15GHz Limit flag on mc15GHz
23- 27 F5.2 % mc15GHz Fractional circular polarization at 15GHz
29- 32 F4.2 % e_mc15GHz ? Error in mc15GHz
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Global Notes:
Note (G1): Where sigma=|mc|/Δmc.
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History:
From electronic version of the journal
References:
Lister & Homan Paper I. 2005AJ....130.1389L 2005AJ....130.1389L Cat. J/AJ/130/1389
Cooper et al. Paper III. 2007ApJS..171..376C 2007ApJS..171..376C Cat. J/ApJS/171/376
Cara & Lister Paper IV. 2008ApJ...674..111C 2008ApJ...674..111C
Lister et al. Paper V. 2009AJ....137.3718L 2009AJ....137.3718L Cat. J/AJ/137/3718
Lister et al. Paper VI. 2009AJ....138.1874L 2009AJ....138.1874L Cat. J/AJ/138/1874
Homan et al. Paper VII. 2009ApJ...706.1253H 2009ApJ...706.1253H Cat. J/ApJ/706/1253
Hovatta et al. Paper VIII. 2012AJ....144..105H 2012AJ....144..105H Cat. J/AJ/144/105
Pushkarev et al. Paper IX. 2012A&A...545A.113P 2012A&A...545A.113P Cat. J/A+A/545/A113
Lister et al. Paper X. 2013AJ....146..120L 2013AJ....146..120L Cat. J/AJ/146/120
Hovatta et al. Paper XI. 2014AJ....147..143H 2014AJ....147..143H Cat. J/AJ/147/143
Homan et al. Paper XII. 2015ApJ...798..134H 2015ApJ...798..134H Cat. J/ApJ/798/134
Lister et al. Paper XIII. 2016AJ....152...12L 2016AJ....152...12L Cat. J/AJ/152/12
Pushkarev et al. Paper XIV. 2017MNRAS.468.4992P 2017MNRAS.468.4992P Cat. J/MNRAS/468/4992
Lister et al. Paper XV. 2018ApJS..234...12L 2018ApJS..234...12L Cat. J/ApJS/234/12
Hodge et al. Paper XVI. 2018ApJ...862..151H 2018ApJ...862..151H Cat. J/ApJ/862/151
Lister et al. Paper XVII. 2019ApJ...874...43L 2019ApJ...874...43L Cat. J/ApJ/874/43
Lister et al. Paper XVIII. 2021ApJ...923...30L 2021ApJ...923...30L Cat. J/ApJ/923/30
Homan et al. Paper XIX. 2021ApJ...923...67H 2021ApJ...923...67H Cat. J/ApJ/923/67
Pushkarev et al. Paper XX. 2023MNRAS.520.6053P 2023MNRAS.520.6053P
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 25-Jan-2007