Query : 2013A&A...557A..75C

2013A&A...557A..75C - Astronomy and Astrophysics, volume 557A, 75-75 (2013/9-1)

Orientation of the cores of hybrid morphology radio sources.


Abstract (from CDS):

The FRI/FRII dichotomy is a much debated issue in the astrophysics of extragalactic radio sources. Study of the properties of HYbrid MOrphology Radio Sources (HYMORS) may bring crucial information and lead to a step forward in understanding the origin of FRI/FRII dichotomy. HYMORS are a rare class of double-lobed radio sources where each of the two lobes clearly exhibits a different FR morphology. This article describes follow-up high resolution VLBA observations of the five discovered by us HYMORS. The main aim of the observations was to answer the questions of whether the unusual radio morphology is connected to the orientation of objects towards the observer. The milliarcsecond-scale structures are good probes of the galactic medium, the possible asymmetries, and orientation of the central engines of the sources. We obtained the high resolution radio maps of five hybrid radio morphology objects with the VLBA at C-band and L-band. The cores of all five sources have been detected at both radio bands. Two of them revealed milliarcsecond core-jet structures, the next two objects showed hints of parsec-scale jets, and the last one remained point-like at both frequencies. We compared properties of observed milliarcsecond structures of hybrid sources with the larger scale ones previously detected with the VLA. We find that on both scales the fluxes of their central components are similar, which may indicate the lack of additional emission in the proximity of the nucleus. This suggests that jets present on the ∼1-10kpc scale in those objects are FRII-like. When possible, the detected core-jet structures were used for estimating the core's spatial orientation. The result is that neither the FRI-like nor the FRII-like side is preferred, which may suggest that no specific spatial orientation of HYMORS is required to explain their radio morphology. Their estimated viewing angles indicate they are unbeamed objects. The 178/151MHz luminosity of observed HYMORS exceed the traditional FRI/FRII break luminosity, indicating they have radio powers similar to FRIIs.

Abstract Copyright:

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

CDS comments: Figs, Table 2: WN components of sources are not in SIMBAD

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 2E 2389 Sy1 11 04 13.8611496720 +76 58 58.194549084   15.70 15.72 15.40   ~ 521 1
2 4C 51.28 rG 11 53 46.42752 +51 17 04.1604           ~ 14 1
3 6C 120350+503428 QSO 12 06 22.40424 +50 17 44.3184           ~ 10 1
4 NVSS J121158+741904 rG 12 11 58.6937788320 +74 19 04.085299596           ~ 25 0
5 6C 131118+505755 BLL 13 13 25.7733683880 +50 42 06.192943920           ~ 6 1
6 NVSS J131437+513413 rG 13 14 38.1259416288 +51 34 13.324101780           ~ 5 1
7 [VV2006] J134751.5+283630 QSO 13 47 51.5850085032 +28 36 29.707097868   17.79 17.41     ~ 33 1
8 2E 3648 Sy1 16 20 21.8185395384 +17 36 23.952361176   16.53 16.41 20.5   ~ 401 2

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