J/ApJ/710/764 Extended radio emission in MOJAVE blazars (Kharb+, 2010)
Extended radio emission in MOJAVE blazars: challenges to unification.
Kharb P., Lister M.L., Cooper N.J.
<Astrophys. J., 710, 764-782 (2010)>
=2010ApJ...710..764K 2010ApJ...710..764K
ADC_Keywords: Active gal. nuclei ; Morphology ; Radio continuum ; QSOs ;
Redshifts ; BL Lac objects
Keywords: BL Lacertae objects: general - galaxies: active - quasars: general -
radio continuum: galaxies
Abstract:
We present the results of a study on the kiloparsec-scale radio
emission in the complete flux density limited MOJAVE sample,
comprising 135 radio-loud active galactic nuclei. New 1.4GHz Very
Large Array (VLA) radio images of six quasars and previously
unpublished images of 21 blazars are presented, along with an analysis
of the high-resolution (VLA A-array) 1.4GHz emission for the entire
sample. While extended emission is detected in the majority of the
sources, about 7% of the sources exhibit only radio core emission. We
expect more sensitive radio observations, however, to detect faint
emission in these sources, as we have detected in the erstwhile
"core-only" source, 1548+056. The kiloparsec-scale radio morphology
varies widely across the sample. Many BL Lac objects exhibit extended
radio power and kiloparsec-scale morphology typical of powerful FRII
jets, while a substantial number of quasars possess radio powers
intermediate between FRIs and FRIIs.
Description:
We observed seven MOJAVE quasars at 1.46GHz with the Very Large Array
(VLA) in the A-array configuration (typical synthesized beam ∼1.5") on
2007 June 30 (Program ID:AC874). Sixty MOJAVE sources were previously
observed by us with the VLA A-array and presented in Cooper et al.
(2007, Cat. J/ApJS/171/376). Data for the remaining sources were
reduced directly using archival VLA A-array data or obtained through
published papers.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 135 MOJAVE sample
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
J/ApJ/706/1253 : MOJAVE VII. Blazar jet acceleration (Homan+, 2009)
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/131/1262 : Circular polarization images at 15GHz of AGN jets (Homan+,
2006)
J/AJ/130/1389 : Linear polarization of AGN jets at 15GHz (Lister+, 2005)
http://www.physics.purdue.edu/MOJAVE/ : MOJAVE program homepage
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 (HHMM+DDd; IAU B1950 names)
9 A1 --- n_Name [b] Note on individual sources (1)
11- 16 F6.4 --- z ? Redshift
18- 22 F5.2 mag Vmag ? Apparent V-band magnitude (2)
24 A1 --- Type Blazar classification (3)
26 A1 --- Pol [Y/N]? Highly optically polarized?
28- 33 F6.3 Jy Ipk Peak intensity in radio map in Jy/beam
34 A1 --- f_Ipk [d] Flag on Ipk (1)
36- 41 E6.2 Jy Irms rms intensity in radio map in Jy/beam (4)
43- 48 F6.4 GHz Freq Central observing frequency
50- 55 F6.3 --- beta ? Apparent parsec-scale speed of the fastest jet
feature (βapp)
57- 61 F5.2 Jy Score Integrated core flux density at ∼1.4GHz (5)
63- 68 E6.2 mJy Sext Extended flux density obtained by subtracting
the core from the total radio flux density
70- 79 A10 --- Morph Radio morphology (6)
81- 83 I3 deg Jpa1 Parsec-scale jet position angle
85- 87 I3 deg Jpa2 ? Kiloparsec-scale jet position angle
89- 94 A6 --- PID VLA archive project IDs for the radio data
95 A1 --- Ref [acm] References (7)
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Note (1): Flag as follows:
b = Sources do not show any discernable extended emission.
d = For Cygnus A, the peak intensity corresponds to the south-eastern hot
spot.
Note (2): Apparent V-band magnitude obtained from the AGN catalog of
Veron-Cetty & Veron (2006, See Cat. VII/258) or NED.
Note (3): Classification as follows:
Q = quasar;
B = BL Lac object;
G = radio galaxy;
U = Unidentified.
Note (4): Irms for the sources in Murphy et al. (1993MNRAS.264..298M 1993MNRAS.264..298M)
are the lowest contour level (CLEV) values in their Table 2.
Note (5): The integrated flux densities for the cores were obtained in
Astronomical Image Processing System (AIPS) using the Gaussian-fitting
task JMFIT.
Note (6): Morphology as follows:
c = core only;
ch = core-halo;
1hs = 1 hot spot;
2hs = 2 hot spots;
2 = one-sided;
3 = two-sided;
1hs+2 = two sided structure with hot spot on one side.
Alternate morphologies are listed separated by commas.
Note (7): References as follows:
a = New data presented in this paper (VLA program ID AC874)
c = Data presented in Cooper et al. (2007, Cat. J/ApJS/171/376;
PID AL634).
m = Murphy et al. (1993MNRAS.264..298M 1993MNRAS.264..298M)
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 14-Mar-2012