J/AJ/136/159 Global 86GHz VLBI survey of compact radio sources (Lee+, 2008)
A global 86 GHz VLBI survey of compact radio sources.
Lee S.-S., Lobanov A.P., Krichbaum T.P., Witzel A., Zensus A., Bremer M.,
Greve A., Grewing M.
<Astron. J., 136, 159-180 (2008)>
=2008AJ....136..159L 2008AJ....136..159L
ADC_Keywords: Surveys ; VLBI ; Radio sources
Keywords: BL Lacertae objects: general - galaxies: active - galaxies: jets -
quasars: general - radio continuum: galaxies - surveys
Abstract:
We present results from a large 86GHz global very long baseline
interferometry (VLBI) survey of compact radio sources. The main goal
of the survey is to increase by factors of 3-5 the total number of
objects accessible for future 3mm VLBI imaging. The survey
observations reach a baseline sensitivity of 0.1Jy and an image
sensitivity of better than 10mJy/beam. A total of 127 compact radio
sources have been observed. The observations have yielded images for
109 sources, extending the database of the sources imaged at 86GHz
with VLBI observation by a factor of 5, and only six sources have not
been detected. The remaining 12 objects have been detected but could
not be imaged due to insufficient closure phase information.
Description:
The survey observations were conducted during three sessions of the
Coordinated (global) Millimeter VLBI Array (CMVA/GMVA) on 2001
October, 2002 April and 2002 October.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 78 127 Source list
table6.dat 79 123 Image parameters
table7.dat 79 262 Model fit parameters of sources
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- IAU Source IAU identification
10- 18 A9 --- Name Common source name
20- 24 A5 --- Ep Observing epochs (G1)
26- 27 I2 h RAh Hour of Right Ascension (J2000)
29- 30 I2 min RAm Minute of Right Ascension (J2000)
32- 39 F8.5 s RAs Second of Right Ascension (J2000)
41 A1 --- DE- Sign of the Declination (J2000)
42- 43 I2 deg DEd Degree of Declination (J2000)
45- 46 I2 arcmin DEm Arcminute of Declination (J2000)
48- 54 F7.4 arcsec DEs Arcsecond of Declination (J2000)
56- 57 A2 --- St Detection status (2)
59- 63 F5.3 --- z ? Redshift from Veron-Cetty & Veron
(2006, Cat VII/258)
65 A1 --- Type [BQGSU] Optical type from Veron-Cetty & Veron
(2006, Cat VII/258) (3)
67- 70 F4.1 mag Vmag ? The V band magnitude from NED
72- 76 F5.2 Jy S86 ? Total 86GHz flux density (4)
78 A1 --- n_S86 [d] indicates a mean flux on multiple epochs
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Note (2): Source status as follows:
- = not detected
+ = detected
+m = detected and only model fitted
++ = detected and imaged
Note (3): Optical type code as follows:
Q = quasar
B = BL Lac object
G = radio galaxy
S = star
U = unidentified
Note (4): Obtained from pointing and calibration scan measurements made at
Pico Veleta.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- IAU Source IAU identification
10 A1 --- Ep Observing epoch (G1)
12- 16 F5.2 Jy S86 ? Total 86GHz flux density (2)
18- 21 F4.2 Jy SS Correlated flux density on shortest baseline
23- 26 F4.2 Jy e_SS Uncertainty in SS
28- 30 I3 --- BS Shortest baseline in units of Mλ (3.5km)
32- 35 F4.2 Jy SL Correlated flux density on longest baseline
37- 40 F4.2 Jy e_SL Uncertainty in SL
42- 45 I4 --- BL Longest baseline in units of Mλ (3.5km)
47- 50 I4 uas Ba Restoring beam major axis (in µarcsec)
52- 54 I3 uas Bb Restoring beam minor axis (in µarcsec)
56- 60 F5.1 deg BPA Restoring beam position angle
62- 65 I4 mJy Stot Total CLEAN model flux density
67- 70 I4 mJy Speak Peak flux density in units of mJy/beam
72- 74 I3 mJy sigma Off-source RMS in image in units of mJy/beam
76- 79 F4.2 --- q_sigma Quality of residual noise in image
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Note (2): Obtained from pointing and calibration scan measurements made
at Pico Veleta.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- IAU Source IAU identification (1)
10 A1 --- Ep Observing epoch (G1)
12- 15 I4 mJy Stot Model flux density
17- 20 I4 mJy e_Stot Uncertainty in STot
22- 25 I4 mJy Speak Component peak brightness in units of mJy/beam
27- 30 I4 mJy e_Speak Uncertainty in SPeak
32 A1 --- l_d Upper limit flag on d
33- 36 I4 uas d Component size, in µarcsec
38- 40 I3 uas e_d ? Uncertainty in d
42- 45 I4 uas r ? Component (jet) radius, in µarcsec
47- 49 I3 uas e_r ? Uncertainty in r
51- 56 F6.1 deg theta ? Position angle (jet) (2)
58- 61 F4.1 deg e_theta ? Uncertainty in theta
63 A1 --- l_Tb Lower limit flag on Tb
64- 72 F9.4 10+10K Tb Measured brightness temperature
74- 79 F6.3 10+10K e_Tb ? Uncertainty in Tb
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Note (1): For sources with multiple components, parameters of the core
component are followed by those of jet components. For sources
observed at multiple epochs, individual epochs are marked.
Note (2): the location of the jet component with respect to the core component.
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Global notes:
Note (G1): Observing epochs as follows:
A = October 2001
B = April 2002
C = October 2002
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jan-2011