J/ApJ/722/L7 Fermi/LAT detected MOJAVE AGNs (Pushkarev+, 2010)
Radio/Gamma-ray time delay in the parsec-scale cores of active galactic nuclei.
Pushkarev A.B., Kovalev Y.Y., Lister M.L.
<Astrophys. J., 722, L7-L11 (2010)>
=2010ApJ...722L...7P 2010ApJ...722L...7P
ADC_Keywords: Active gal. nuclei ; Gamma rays ; Radio continuum ; Redshifts
Keywords: galaxies: active - galaxies: jets - gamma rays: galaxies -
radio continuum: galaxies
Abstract:
We report the detection of a non-zero time delay between radio
emission measured by the VLBA at 15.4GHz and γ-ray radiation
(γ-ray leads radio) registered by the Large Area Telescope (LAT)
on board the Fermi Gamma-Ray Space Telescope for a sample of 183 radio
and γ-ray bright active galactic nuclei. For the correlation
analysis, we used 0.1-100GeV γ-ray photon fluxes, taken from
monthly binned measurements from the first Fermi LAT catalog (1FGL;
Abdo et al. 2010, Cat. J/ApJS/188/405), and 15.4GHz radio flux
densities from the MOJAVE VLBA program (Lister et al. 2009, Cat.
J/AJ/137/3718). The correlation is most pronounced if the core flux
density is used, strongly indicating that the γ-ray emission is
generated within the compact region of the 15GHz VLBA core.
Determining the Pearson's r and Kendall's τ correlation
coefficients for different time lags, we find that for the majority of
sources the radio/γ-ray delay ranges from 1 to 8 months in the
observer's frame and peaks at approximately 1.2 months in the source's
frame. We interpret the primary source of the time delay to be
synchrotron opacity in the nuclear region.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 101 182 LAT-detected MOJAVE AGNs
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
J/ApJ/715/429 : First Fermi-LAT AGN catalog (1LAC) (Abdo+, 2010)
J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010)
J/ApJ/700/597 : FERMI LAT detected blazars (Abdo+, 2009)
J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)
J/ApJ/707/L56 : VLBI and bright Fermi/LAT sources (Kovalev, 2009)
J/ApJS/175/97 : CGRaBS: γ-ray blazar candidates (Healey+, 2008)
http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=72 : 9th European VLBI
Symposium
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- VLBI IAU name (HHMM-DDd; B1950) of VLBI association
( or in Simbad)
10- 23 A14 --- AName Alternative name
25- 28 A4 --- --- [1FGL]
30- 41 A12 --- 1FGL First Fermi LAT catalog name (JHHMM.m+DDMM)
43- 47 F5.3 --- z ? Redshift
49- 67 A19 --- Auth Redshift author's reference
69- 87 A19 --- r_z Redshift bibcode's reference
89-101 A13 --- Cat Redshift catalog's reference
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 12-Jul-2012