J/AJ/134/799 Multiwaveband polarimetry of 15 AGN (Jorstad+, 2007)
Multiwaveband polarimetric observations of 15 active galactic nuclei at high
frequencies: correlated polarization behavior.
Jorstad S.G., Marscher A.P., Stevens J.A., Smith P.S., Forster J.R.,
Gear W.K., Cawthorne T.V., Lister M.L., Stirling A.M., Gomez J.L.,
Greaves J.S., Robson E.I.
<Astron. J., 134, 799-824 (2007)>
=2007AJ....134..799J 2007AJ....134..799J
ADC_Keywords: BL Lac objects ; Polarization
Keywords: BL Lacertae objects: individual (1803+784, 1823+568, 3C 66A, BL Lac,
OJ 287) - galaxies: active - galaxies: individual (3C 111, 3C 120) -
galaxies: jets - polarization - quasars: individual (0420-014,
0528+134, 3C 273, 3C 279, 3C 345, 3C 454.3, CTA 102, PKS 1510-089)
Abstract:
We report on multifrequency linear polarization monitoring of 15
active galactic nuclei containing highly relativistic jets with
apparent speeds from ∼4c to >40c. The measurements were obtained at
optical, 1mm, and 3mm wavelengths, and at 7mm with the Very Long
Baseline Array. The data show a wide range in degree of linear
polarization among the sources, from <1% to >30%, and interday
polarization variability in individual sources. The polarization
properties suggest separation of the sample into three groups with
low, intermediate, and high variability of polarization in the core at
7mm (LVP, IVP, and HVP, respectively).
Description:
We have measured the total flux densities and polarization of the
objects in our sample in four spectral regions: at 7mm (43GHz),
3mm (86GHz), 0.85/1.3mm (350/230GHz), and optical wavelengths
(an effective wavelength of ∼600-700nm).
Objects:
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RA (2000) DE Designation(s)
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04 23 15.8 -01 20 33 0420-014 = QSO B0420-0127
05 30 56.4 +13 31 55 0528+134 = QSO J0530+13
15 12 50.5 -09 06 00 1510-089 = QSO J1512-0906
18 24 07.1 +56 51 01 1823+568 = QSO 1823+568
04 18 21.3 +38 01 36 3C 111 = 2C 379
04 33 11.1 +05 21 16 3C 120 = 3A 0430+048
12 29 06.7 +02 03 09 3C 273 = 2A 1225+022
12 56 11.2 -05 47 22 3C 279 = 1AXG J125611-0547
16 42 58.8 +39 48 37 3C 345 = B2 1641+39
22 53 57.7 +16 08 54 3C 454.3 = BWE 2251+1552
02 22 39.6 +43 02 08 3C 66A = B3 0219+428A
22 02 43.3 +42 16 40 BL Lac = QSO B2200+420
22 32 36.4 +11 43 51 CTA 102 = 4C 11.69
08 54 48.9 +20 06 31 OJ 287 = QSO J0854+2006
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 96 Optical Polarization Data
table2.dat 55 144 JCMT Polarization Data
table3.dat 46 157 BIMA Polarization Data
table4.dat 60 254 VLBA Polarization Data for the Core
table5.dat 73 249 VLBA Polarization Data for the Jet Component
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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 Source name
10- 19 A10 "YYYY/MM/DD" ObsDate Date of observation
21 A1 --- F1 [VR] Photometry filter bandpass
23 A1 --- f_F1 [ab] photometric estimate (1)
25- 29 F5.2 mag mag ? Apparent magnitude in F1
31- 34 F4.2 mag e_mag ? Uncertainty in mag
36- 40 F5.2 mJy Iopt ? Optical flux density
42- 45 F4.2 mJy e_Iopt ? Uncertainty in Iopt
47 A1 --- F2 [BVRIW] Polarimetry filter bandpass (2)
49 A1 --- l_mopt Limit flag on mopt
50- 54 F5.2 % mopt Degree of linear polarization
56- 59 F4.2 % e_mopt ? Uncertainty in mopt
61- 65 F5.1 deg chiopt ? Polarization position angle
67- 70 F4.1 deg e_chiopt ? Uncertainty in chiopt
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Note (1): Flags as follows:
a = photometric estimate is obtained at the 72-inch Perkins telescope
of the Lowell observatory, Flagstaff, Arizona
b = photometric estimate is found in the Colgate University quasar
optical monitoring data base,
http://astronomy.colgate.edu/astronomy/quasaroptical.html
Note (2): where W denotes an unfiltered, or "white-light" measurement.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Source name
10- 19 A10 "YYYY/MM/DD" ObsDate Date of observation
21- 24 F4.2 mm lambda Observed wavelength (0.85 or 1.35)
26- 30 F5.2 Jy I1mm Flux density at lambda
32- 35 F4.2 Jy e_I1mm Uncertainty in I1mm
37- 40 F4.1 % m1mm ? Degree of linear ploarization at lambda
42- 45 F4.1 % e_m1mm ? Uncertainty in m1mm
46 A1 --- u_m1mm Uncertainty flag on m1mm (1)
48- 50 I3 deg chi1mm ? Polarization position angle at lambda
52- 54 I3 deg e_chi1mm ? Uncertainty in chi1mm
55 A1 --- u_chi1mm Uncertainty flag on chi1mm (1)
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Note (1): Result uncertain due to the weather conditions.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Source name
10- 19 A10 "YYYY/MM/DD" ObsDate Date of observation
21- 25 F5.2 Jy I3mm Flux density at 3mm (86GHz)
27- 30 F4.2 Jy e_I3mm Uncertainty in I3mm
32- 35 F4.1 % m3mm Degree of linear ploarization at 3mm
37- 39 F3.1 % e_m3mm Uncertainty in m3mm
41- 43 I3 deg chi3mm Polarization position angle at 3mm
45- 46 I2 deg e_chi3mm Uncertainty in chi3mm
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Source name
10- 19 A10 "YYYY/MM/DD" ObsDate Date of observation
21- 25 F5.2 Jy I7mm Flux density in the core at 7mm (43GHz)
27- 30 F4.2 Jy e_I7mm Uncertainty in I7mm
32- 37 F6.1 deg theta Projected inner jet direction
39- 41 F3.1 deg e_theta Uncertainty in theta
43 A1 --- l_m7mm Limit flag on m7mm
45- 48 F4.1 % m7mm Degree of linear polarization in the core
at 7mm
50- 52 F3.1 % e_m7mm ? Uncertainty in m7mm
54- 57 I4 deg chi7mm ? Polarization position angle in the core
at 7mm
59- 60 I2 deg e_chi7mm ? Uncertainty in chi7mm
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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 Source name
10- 19 A10 "YYYY/MM/DD" ObsDate Date of observation
21- 25 A5 --- Comp Jet component designation
27- 31 F5.2 --- I7mm Flux density of jet component at 7mm (43GHz)
33- 36 F4.2 --- e_I7mm Uncertainty in I7mm
38- 41 F4.2 mas R Component distance from the core
43- 46 F4.2 mas e_R Uncertainty in R
48- 53 F6.1 deg theta Component position angle relative to the core
55- 57 F3.1 deg e_theta Uncertainty in theta
59- 62 F4.1 % m7mm Degree of linear polarization of component
at 7mm
64- 66 F3.1 % e_m7mm Uncertainty in m7mm
68- 70 I3 deg chi7mm ? Polarization position angle of component
at 7mm
72- 73 I2 deg e_chi7mm ? Uncertainty in chi7mm
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 30-Sep-2009