2020A&A...641A.152A


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.28CET20:57:28

2020A&A...641A.152A - Astronomy and Astrophysics, volume 641A, 152-152 (2020/9-1)

γ-ray emission in radio galaxies under the VLBI scope. II. The relationship between γ-ray emission and parsec-scale jets in radio galaxies.

ANGIONI R., ROS E., KADLER M., OJHA R., MULLER C., EDWARDS P.G., BURD P.R., CARPENTER B., DUTKA M.S., GULYAEV S., HASE H., HORIUCHI S., KRAUSS F., LOVELL J.E.J., NATUSCH T., PHILLIPS C., PLOTZ C., QUICK J.F.H., ROSCH F., SCHULZ R., STEVENS J., TZIOUMIS A.K., WESTON S., WILMS J. and ZENSUS J.A.

Abstract (from CDS):


Aims. This is the second paper in our series studying the evolution of parsec-scale radio emission in radio galaxies in the Southern Hemisphere. Following our study of the radio and high-energy properties of γ-ray-emitting sources, here we investigate the kinematic and spectral properties of the parsec-scale jets of radio galaxies that have not yet been detected by the Fermi Large Area Telescope (Fermi-LAT) instrument on board NASA's Fermi Gamma-ray Space Telescope. For many sources, these results represent the first milliarcsecond resolution information in the literature. These studies were conducted within the framework of the Tracking Active Nuclei with Austral Milliarcsecond Interferometry (TANAMI) monitoring program and in the context of high-energy γ-ray observations from Fermi-LAT.
Methods. We took advantage of the regular 8.4 GHz and 22.3 GHz Very Long Baseline Interferometry (VLBI) observations provided by the TANAMI monitoring program, and explored the kinematic properties of six γ-ray-faint radio galaxies. We complemented this with ∼8.5 years of Fermi-LAT data, deriving updated upper limits on the γ-ray emission from this subsample of TANAMI radio galaxies. We included publicly available VLBI kinematics of γ-ray-quiet radio galaxies monitored by the MOJAVE program and performed a consistent Fermi-LAT analysis. We combined these results with those from our previous paper to construct the largest sample of radio galaxies with combined VLBI and γ-ray measurements to date. The connection between parsec-scale jet emission and high-energy properties in the misaligned jets of radio galaxies was explored.
Results. For the first time, we report evidence of superluminal motion up to βapp=3.6 in the jet of the γ-ray-faint radio galaxy PKS 2153-69. We find a clear trend of higher apparent speed as a function of distance from the jet core, which indicates that the jet is still being accelerated on scales of tens of parsecs, or ∼105Rs, corresponding to the end of the collimation and acceleration zone in nearby radio galaxies. We find evidence of subluminal apparent motion in the jets of PKS 1258-321 and IC 4296, and no measurable apparent motion for PKS 1549-79, PKS 1733-565, and PKS 2027-308. For all these sources, TANAMI provides the first multi-epoch kinematic analysis on parsec scales. We then compare the VLBI properties of γ-ray-detected and undetected radio galaxies, and find that the two populations show a significantly different distribution of median core flux density, and, possibly, of median core brightness temperature. In terms of correlation between VLBI and γ-ray properties, we find a significant correlation between median core flux density and γ-ray flux, but no correlation with typical Doppler boosting indicators such as median core brightness temperature and core dominance .
Conclusions. Our study suggests that high-energy emission from radio galaxies is related to parsec-scale radio emission from the inner jet, but is not driven by Doppler boosting effects, in contrast to the situation in their blazar counterparts. This implies that γ-ray loudness does not necessarily reflect a higher prevalence of boosting effects.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: active - galaxies: nuclei - gamma rays: galaxies - galaxies: jets

VizieR on-line data: <Available at CDS (J/A+A/641/A152): list.dat fits/*>

Status at CDS : Examining the need for a new acronym.

Simbad objects: 33

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Number of rows : 33

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Mrk 1501 Sy1 00 10 31.0058529490 +10 58 29.505989476   15.96 15.40 12.22   ~ 651 0
2 ICRF J002914.2+345632 AGN 00 29 14.24246572 +34 56 32.2471186   20.2       ~ 119 1
3 QSO B0108+388 Bla 01 11 37.31680 +39 06 28.1039     22 22.000   ~ 238 1
4 NAME Pic A Sy1 05 19 49.7230919028 -45 46 43.855209977   15.73 15.77 14.85   ~ 569 1
5 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 726 2
6 QSO B0625-354 BLL 06 27 06.7294147 -35 29 15.339649   14.93       ~ 157 1
7 QSO B0710+439 QSO 07 13 38.16412910 +43 49 17.2071530   20.7       ~ 230 0
8 3FGL J1259.5-3231 Bla 12 59 33 -32 31.1           ~ 5 0
9 NAME PS J1259.7-3223 ? 12 59.7 -32 23           ~ 1 0
10 NAME PS J1259.8-3224 ? 12 59.8 -32 24           ~ 1 0
11 6dFGS gJ125949.8-322329 G 12 59 49.81 -32 23 28.9       19.05   ~ 4 0
12 QSO J1301-3226 Bla 13 01 00.795 -32 26 28.97   13.06 13 11.50   ~ 90 2
13 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4041 3
14 IC 4296 AGN 13 36 39.03275288 -33 57 57.0783023   11.52 12.99 10.00   ~ 448 2
15 NAME Cen B QSO 13 46 49.04327124 -60 24 29.3552337         15.74 ~ 127 0
16 ICRF J134733.3+121724 Sy2 13 47 33.36161542 +12 17 24.2402572   19.28 18.44 15.718   ~ 531 3
17 ICRF J151141.2+051809 Sy1 15 11 41.2664270 +05 18 09.259581   18.49 17.80 13.95   ~ 87 0
18 QSO B1549-790 QSO 15 56 58.86989203 -79 14 04.2815029   18.80 18.800 17.84   ~ 182 1
19 PMN J1603-4904 QSO 16 03 50.690 -49 04 05.49   20.67       ~ 54 0
20 ICRF J160913.3+264129 Sy2 16 09 13.32076181 +26 41 29.0362080   19       ~ 207 0
21 NGC 6328 QSO 17 23 41.02938963 -65 00 36.6113150   13.17 13.2 11.45 12.2 ~ 211 1
22 ICRF J173735.7-563403 Sy1 17 37 35.7723807511 -56 34 03.134800219   17.0       ~ 84 0
23 ICRF J181935.0-634548 Sy2 18 19 35.00241 -63 45 48.1926   16.80   13.4   ~ 134 1
24 ICRF J184208.9+794617 Sy1 18 42 08.9910523393 +79 46 17.129210139   16.06 15.38     ~ 1221 0
25 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2136 2
26 ICRF J202206.6+613658 Sy2 20 22 06.68174818 +61 36 58.8047862     19.5 17.58   ~ 300 1
27 ICRF J203057.9-303924 Bla 20 30 57.9339343 -30 39 24.349197       19.90   ~ 14 0
28 ICRF J213032.8+050217 G 21 30 32.87739291 +05 02 17.4741657     23.4     ~ 143 1
29 NAME PS J2152.0-6956 ? 21 52.0 -69 56           ~ 1 0
30 QSO B2153-699 BLL 21 57 05.9778792381 -69 41 23.684746870   14.23 13.79 12.94   ~ 242 1
31 2FGL J2200.1-6931 Bla 22 00 06 -69 30.2           ~ 14 0
32 NAME PS J2200.5-6929 ? 22 00.5 -69 29           ~ 1 0
33 4FGL J2201.0-6928 gam 22 01 01.7 -69 28 26           ~ 1 0

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2020.11.28-20:57:28

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