TY - JOUR
T1 - VLBI and single-dish monitoring of 3C 84 for the period 2009-2011
AU - Nagai, H.
AU - Orienti, M.
AU - Kino, M.
AU - Suzuki, K.
AU - Giovannini, G.
AU - Doi, A.
AU - Asada, K.
AU - Giroletti, M.
AU - Kataoka, J.
AU - D'Ammando, F.
AU - Inoue, M.
AU - Lähteenmäki, A.
AU - Tornikoski, M.
AU - Léon-Tavares, J.
AU - Kameno, S.
AU - Bach, U.
PY - 2012/6
Y1 - 2012/6
N2 - The radio galaxy 3C 84 is a representative of γ -ray-bright misaligned active galactic nuclei (AGNs) and one of the best laboratories to study the radio properties of the subparsec jet in connection with the γ -ray emission. In order to identify possible radio counterparts of γ -ray emissions in 3C 84, we study the change in structure within the central 1 pc and the light curve of subparsec-sized components C1, C2 and C3. We search for any correlation between changes in the radio components and the γ -ray flares by making use of the Very Long Baseline Interferometry (VLBI) and single-dish data. Throughout the radio monitoring spanning over two GeV γ -ray flares detected by the Fermi Large Area Telescope and theMAGIC Cherenkov Telescope during 2009 April-May and 2010 June-August, the total flux density in the radio band increases on average. This flux increase mostly originates in C3. Although γ -ray flares span the time-scale of days to weeks, no clear correlation with the radio light curve on this time-scale is found. No new prominent components and change in morphology associated with the γ -ray flares are found on VLBI images.
AB - The radio galaxy 3C 84 is a representative of γ -ray-bright misaligned active galactic nuclei (AGNs) and one of the best laboratories to study the radio properties of the subparsec jet in connection with the γ -ray emission. In order to identify possible radio counterparts of γ -ray emissions in 3C 84, we study the change in structure within the central 1 pc and the light curve of subparsec-sized components C1, C2 and C3. We search for any correlation between changes in the radio components and the γ -ray flares by making use of the Very Long Baseline Interferometry (VLBI) and single-dish data. Throughout the radio monitoring spanning over two GeV γ -ray flares detected by the Fermi Large Area Telescope and theMAGIC Cherenkov Telescope during 2009 April-May and 2010 June-August, the total flux density in the radio band increases on average. This flux increase mostly originates in C3. Although γ -ray flares span the time-scale of days to weeks, no clear correlation with the radio light curve on this time-scale is found. No new prominent components and change in morphology associated with the γ -ray flares are found on VLBI images.
KW - Galaxies: active
KW - Galaxies: individual: 3C 84
KW - Galaxies: individual: NGC 1275
KW - Galaxies: jets
KW - Radio Continuum: galaxies
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U2 - 10.1111/j.1745-3933.2012.01269.x
DO - 10.1111/j.1745-3933.2012.01269.x
M3 - Article
AN - SCOPUS:84867877751
SN - 1745-3933
VL - 423
SP - L122-L126
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 1
ER -