Abstract
Following the discovery of a new radio component right before the GeV γ-ray detection since 2008 August by the Fermi Gamma-ray Space Telescope, we present a detailed study of the kinematics and light curve on the central sub-parsec scale of 3C 84 using the archival Very Long Baseline Array 43GHz data covering the period between 2002 January and 2008 November. We find that the new component "C3," previously reported by the observations with the Very Long Baseline Interferometer Exploration of Radio Astrometry, was already formed in 2003. The flux density of C3 increases moderately until 2008, and then it becomes brighter rapidly after 2008. The radio core, C1, also shows a similar trend. The apparent speed of C3 with reference to the core C1 shows moderate acceleration from 0.10c to 0.47c between 2003 November and 2008 November, but is still sub-relativistic. We further try to fit the observed broadband spectrum by the one-zone synchrotron self-Compton model using the measured apparent speed of C3. The fit can reproduce the observed γ-ray emission, but does not agree with the observed radio spectral index between 22 and 43GHz.
| Original language | English |
|---|---|
| Article number | 140 |
| Journal | Astrophysical Journal |
| Volume | 746 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2012 Feb 20 |
Fingerprint
Keywords
- galaxies: active
- galaxies: individual (NGC 1275, Perseus A, 3C 84)
- galaxies: jets
- gamma rays: galaxies
ASJC Scopus subject areas
- Space and Planetary Science
- Astronomy and Astrophysics
Cite this
Exploring the central sub-parsec region of the γ-ray bright radio galaxy 3C 84 with VLBA at 43GHz in the period of 20022008. / Suzuki, Kenta; Nagai, Hiroshi; Kino, Motoki; Kataoka, Jun; Asada, Keiichi; Doi, Akihiro; Inoue, Makoto; Orienti, Monica; Giovannini, Gabriele; Giroletti, Marcello; Lähteenmäki, Anne; Tornikoski, Merja; León-Tavares, Jonathan; Bach, Uwe; Kameno, Seiji; Kobayashi, Hideyuki.
In: Astrophysical Journal, Vol. 746, No. 2, 140, 20.02.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Exploring the central sub-parsec region of the γ-ray bright radio galaxy 3C 84 with VLBA at 43GHz in the period of 20022008
AU - Suzuki, Kenta
AU - Nagai, Hiroshi
AU - Kino, Motoki
AU - Kataoka, Jun
AU - Asada, Keiichi
AU - Doi, Akihiro
AU - Inoue, Makoto
AU - Orienti, Monica
AU - Giovannini, Gabriele
AU - Giroletti, Marcello
AU - Lähteenmäki, Anne
AU - Tornikoski, Merja
AU - León-Tavares, Jonathan
AU - Bach, Uwe
AU - Kameno, Seiji
AU - Kobayashi, Hideyuki
PY - 2012/2/20
Y1 - 2012/2/20
N2 - Following the discovery of a new radio component right before the GeV γ-ray detection since 2008 August by the Fermi Gamma-ray Space Telescope, we present a detailed study of the kinematics and light curve on the central sub-parsec scale of 3C 84 using the archival Very Long Baseline Array 43GHz data covering the period between 2002 January and 2008 November. We find that the new component "C3," previously reported by the observations with the Very Long Baseline Interferometer Exploration of Radio Astrometry, was already formed in 2003. The flux density of C3 increases moderately until 2008, and then it becomes brighter rapidly after 2008. The radio core, C1, also shows a similar trend. The apparent speed of C3 with reference to the core C1 shows moderate acceleration from 0.10c to 0.47c between 2003 November and 2008 November, but is still sub-relativistic. We further try to fit the observed broadband spectrum by the one-zone synchrotron self-Compton model using the measured apparent speed of C3. The fit can reproduce the observed γ-ray emission, but does not agree with the observed radio spectral index between 22 and 43GHz.
AB - Following the discovery of a new radio component right before the GeV γ-ray detection since 2008 August by the Fermi Gamma-ray Space Telescope, we present a detailed study of the kinematics and light curve on the central sub-parsec scale of 3C 84 using the archival Very Long Baseline Array 43GHz data covering the period between 2002 January and 2008 November. We find that the new component "C3," previously reported by the observations with the Very Long Baseline Interferometer Exploration of Radio Astrometry, was already formed in 2003. The flux density of C3 increases moderately until 2008, and then it becomes brighter rapidly after 2008. The radio core, C1, also shows a similar trend. The apparent speed of C3 with reference to the core C1 shows moderate acceleration from 0.10c to 0.47c between 2003 November and 2008 November, but is still sub-relativistic. We further try to fit the observed broadband spectrum by the one-zone synchrotron self-Compton model using the measured apparent speed of C3. The fit can reproduce the observed γ-ray emission, but does not agree with the observed radio spectral index between 22 and 43GHz.
KW - galaxies: active
KW - galaxies: individual (NGC 1275, Perseus A, 3C 84)
KW - galaxies: jets
KW - gamma rays: galaxies
UR - http://www.scopus.com/inward/record.url?scp=84863142457&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863142457&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/746/2/140
DO - 10.1088/0004-637X/746/2/140
M3 - Article
AN - SCOPUS:84863142457
VL - 746
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 140
ER -