J/ApJ/784/159 Revisited jet bending in γ-ray AGNs (Graham+, 2014)
The importance of jet bending in gamma-ray AGNs--Revisited.
Graham P.J., Tingay S.J.
<Astrophys. J., 784, 159 (2014)>
=2014ApJ...784..159G 2014ApJ...784..159G (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Gamma rays ; VLBI
Keywords: galaxies: active - galaxies: jets - gamma rays: general -
quasars: general
Abstract:
We investigate the hypothesis that γ-ray-quiet active galactic
nuclei (AGNs) have a greater tendency for jet bending than
γ-ray-loud AGNs, revisiting the analysis of Tingay et al. We
perform a statistical analysis using a large sample of 351 radio-loud
AGNs along with γ-ray identifications from the Fermi Large Area
Telescope (LAT). Our results show no statistically significant
differences in jet-bending properties between γ-ray-loud and
γ-ray-quiet populations, indicating that jet bending is not a
significant factor for γ-ray detection in AGNs.
Description:
We use the "clean sample", a subset of sources from the second Fermi
Large Area Telescope (LAT) Active Galactic Nuclei (AGN) catalog (2LAC;
Ackermann et al. 2011, cat. J/ApJ/743/171) that possess
high-confidence associations between radio and γ-ray
counterparts, and Very Long Baseline Interferometry (VLBI) images
accessible in the published literature or from the Radio Fundamental
Catalog (RFC; version "rfc_2013d"; Beasley et al. 2002 (cat.
J/ApJS/141/13), Fomalont et al. 2003 (cat. J/AJ/126/2562), Immer et
al. 2011 (cat. J/ApJS/194/25), Kovalev et al. 2007 (cat.
J/AJ/133/1236), Petrov et al. (2005, cat. J/AJ/129/1163; 2006, cat.
J/AJ/131/1872; 2008, cat. J/AJ/136/580; 2011, cat. J/AJ/142/35; 2011,
cat. J/MNRAS/414/2528), Petrov & Taylor 2011 (cat. J/AJ/142/89),
Petrov (2011, cat. J/AJ/142/105; 2012, cat. J/MNRAS/419/1097; 2013,
cat. J/AJ/146/5)).
Our RFC-based sample consists of 351 AGNs in total. The sample
contains 151 γ-ray-loud AGNs from the clean sample (see Table1).
A γ-ray-quiet subsample was defined by the 200 AGNs not detected
by LAT (see Table2).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 151 Jet-bend data for γ-ray-loud radio Active
Galactic Nuclei (AGNs)
table2.dat 61 200 Jet-bend data for γ-ray-quiet radio Active
Galactic Nuclei (AGNs)
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See also:
VIII/40 : GB6 catalog of radio sources (Gregory+ 1996)
VIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-1996)
J/AJ/146/5 : Optically Bright extragalactic Radio Sources II
(Petrov+, 2013)
J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
J/MNRAS/419/1097 : The EVN Galactic Plane Survey - EGaPS (Petrov, 2012)
J/MNRAS/414/2528 : LBA Calibrator Survey (LCS1) (Petrov+, 2011)
J/ApJS/194/25 : The VLBA calibrator search for BeSSeL survey (Immer+, 2011)
J/AJ/142/105 : Optically Bright Extragalactic Radio Sources (Petrov+, 2011)
J/AJ/142/89 : Precise astrometry with VLBA (VIPS) (Petrov+, 2011)
J/AJ/142/35 : The VLBA Galactic Plane Survey (VGaPS) (Petrov+, 2011)
J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)
J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)
J/ApJS/175/314 : VSOP 5GHz AGN survey V. (Dodson+, 2008)
J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)
J/AJ/136/159 : Global 86GHz VLBI survey of compact radio sources
(Lee+, 2008)
J/ApJS/171/61 : All-Sky Survey of Flat-Spectrum Radio Sources
(Healey+, 2007)
J/AJ/133/1236 : Fifth VLBA calibrator survey: VCS5 (Kovalev+, 2007)
J/AJ/131/1872 : Fourth VLBA calibrator survey: VCS4 (Petrov+, 2006)
J/AJ/130/2529 : 8.4GHz VLBI observations of Southern ICRF sources
(Ojha+, 2005)
J/AJ/129/1163 : Third VLBA calibrator survey: VCS3 (Petrov+, 2005)
J/ApJS/155/33 : VSOP 5 GHz AGN Survey. III (Scott+, 2004)
J/AJ/127/3609 : VLBI observations of southern ICRF sources (Ojha+, 2004)
J/AJ/126/2562 : Second VLBA calibrator survey: VCS2 (Fomalont+, 2003)
J/ApJS/141/13 : VLBA calibrator survey: VCS1 catalog (Beasley+, 2002)
J/ApJS/131/95 : VSOP 5 GHz continuum survey (Fomalont+, 2000)
J/ApJS/128/17 : VLBA obs. of radio reference frame sources. III.
(Fey+, 2000)
J/ApJS/100/1 : Second Caltech-Jodrell Bank VLBI Survey. II.
(Henstock+ 1995)
J/ApJS/99/297 : First Caltech-Jodrell Bank VLBI Survey. III (Xu+ 1995)
J/ApJS/95/345 : Second Caltech-Jodrell Bank VLBI Survey. I. (Taylor+ 1994)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Source identifier (JHHMM+DDMM format)
12- 17 F6.3 Jy S4.85 The 4.85GHz flux density (S4.85) (1)
19- 21 I3 deg PA ? Parsec-scale jet position angle (Φpc)
23- 26 I4 deg B1 ? First bending angle along the jet
28- 31 I4 deg B2 ? Second bending angle along the jet
33 I1 --- Npc ? Number of parsec-scale bends (Npc)
35- 37 I3 deg Bend ? Maximum jet-bend angle (|θpc|max)
39- 61 A23 --- Ref References for the Very Long Baseline
Interferometry (VLBI) map (2)
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Note (1): Given by the CRATES catalog (Healey et al. 2007, cat. J/ApJS/171/61).
Note (2): Reference code defined as follows:
* = denotes the reference used to determine jet bends and maximum
jet-bending angle where multiple references exist;
1 = Bondi et al. (1996A&A...308..415B 1996A&A...308..415B);
2 = Dodson et al. 2008 (cat. J/ApJS/175/314) and Scott et al. 2004
(cat. J/ApJS/155/33);
3 = Fey & Charlot (1997ApJS..111...95F 1997ApJS..111...95F);
4 = Fey & Charlot 2000 (cat. J/ApJS/128/17);
5 = Fey, Clegg & Fomalont (1996ApJS..105..299F 1996ApJS..105..299F);
6 = Fomalont et al. 2000 (cat. J/ApJS/131/95);
7 = Henstock et al. 1995 (cat. J/ApJS/100/1);
8 = Lee et al. 2008 (cat. J/AJ/136/159);
9 = Lister et al. 2009 (MOJAVE; cat. J/AJ/137/3718);
10 = Ojha et al. 2005 (cat. J/AJ/130/2529);
11 = Ojha et al. 2004 (cat. J/AJ/127/3609);
12 = Ojha et al. (2010A&A...519A..45O 2010A&A...519A..45O);
13 = Pearson & Readhead (1988ApJ...328..114P 1988ApJ...328..114P);
14 = Radio Fundamental Catalog (RFC; version "rfc_2013d"; Beasley et al.
2002 (cat. J/ApJS/141/13), Fomalont et al. 2003 (cat. J/AJ/126/2562),
Immer et al. 2011 (cat. J/ApJS/194/25), Kovalev et al. 2007
(cat. J/AJ/133/1236), Petrov et al. (2005, cat. J/AJ/129/1163; 2006,
cat. J/AJ/131/1872; 2008, cat. J/AJ/136/580; 2011, cat. J/AJ/142/35;
2011, cat. J/MNRAS/414/2528), Petrov & Taylor 2011 (cat. J/AJ/142/89),
Petrov (2011, cat. J/AJ/142/105; 2012, cat. J/MNRAS/419/1097; 2013,
cat. J/AJ/146/5));
15 = Shen et al. (1998AJ....115.1357S 1998AJ....115.1357S);
16 = Taylor et al. 1994 (cat. J/ApJS/95/345);
17 = Taylor et al. (1996ApJS..107...37T 1996ApJS..107...37T);
18 = Tingay, Murphy & Edwards (Paper I; 1998ApJ...500..673T 1998ApJ...500..673T);
19 = Tingay et al. (2002ApJS..141..311T 2002ApJS..141..311T);
20 = Xu et al. 1995 (cat. J/ApJS/99/297).
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History:
From electronic version of the journal
References:
Tingay et al., Paper I, 1998ApJ...500..673T 1998ApJ...500..673T
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 01-Aug-2016