2015A&A...576A..38B


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.06CEST00:28:38

2015A&A...576A..38B - Astronomy and Astrophysics, volume 576A, 38-38 (2015/4-1)

Pilot study of the radio-emitting AGN population: the emerging new class of FR 0 radio-galaxies.

BALDI R.D., CAPETTI A. and GIOVANNINI G.

Abstract (from CDS):

We present the results of a pilot JVLA project aimed at studying the bulk of the radio-emitting AGN population, that was unveiled by the NVSS/FIRST and SDSS surveys. The key questions are related to the origin of their radio-emission and to its connection with the properties of their hosts. We obtained A-array observations at the JVLA at 1.4, 4.5, and 7.5GHz for 12 sources, a small but representative subsample. The radio maps reveal compact unresolved or only slightly resolved radio structures on a scale of 1-3kpc, with the one exception of a hybrid FR I/FR II source extended over ∼40kpc. Thanks to either the new high-resolution maps or to the radio spectra, we isolated the radio core component in most of them. We split the sample into two groups. Four sources have low black hole (BH) masses (mostly ∼107M) and are hosted by blue galaxies, often showing evidence of a contamination from star formation to their radio emission, and are associated with radio-quiet (RQ) AGN. The second group consists in seven radio-loud (RL) AGN, which are located in red massive (∼1011M) early-type galaxies, have high BH masses (>108M), and are spectroscopically classified as low excitation galaxies (LEG). These are all characteristics typical of FR I radio galaxies. They also lie on the correlation between radio core power and [O III] line luminosity defined by FR Is. However, they are more core-dominated (by a factor of ∼30) than FR Is and show a deficit of extended radio emission. We dub these sources ``FR 0'' to emphasize their lack of prominent extended radio emission, which is their single distinguishing feature with respect to FR Is. The differences in radio properties between FR 0s and FR Is might be ascribed to an evolutionary effect, with the FR 0 sources undergoing rapid intermittency that prevents the growth of large-scale structures. However, this contrasts with the scenario in which low-luminosity radio-galaxies are fed by continuous accretion of gas from their hot coronae. In our preferred scenario the lack of extended radio emission in FR 0s is due to their lower jet Lorentz Γ factor with respect to FR Is. The slower jets in FR 0s are more subject to instabilities and entrainment, which causes their premature disruption.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: nuclei - galaxies: jets - radio continuum: galaxies

CDS comments: Table 1 objects [BKH2005b] DDD.ddddd+D.dddd.

Simbad objects: 17

goto Full paper

goto View the reference in ADS

Number of rows : 17

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 NVSS J000140+010529 rG 00 01 40.2178789803 +01 05 31.319829196           ~ 4 0
2 MCG+00-02-007 Sy2 00 20 34.691 -00 28 14.94   19.74 18.85     ~ 12 0
3 ICRF J002225.4+001456 BiC 00 22 25.4258623 +00 14 56.161217   21.1       ~ 105 1
4 IRAS 00321-0018 Sy2 00 34 43.517 -00 02 26.72   16.26 15.67     ~ 42 0
5 2MASX J00393786-0019431 Sy1 00 39 37.8380473460 -00 19 43.366958028   19.29 18.59     ~ 9 0
6 LBQS 0056-0009 Sy1 00 59 05.5145931113 +00 06 51.619894852   18.07 17.89 16.9   ~ 248 1
7 6dFGS gJ010101.1-002444 AGN 01 01 01.1161954421 -00 24 44.350934444   17.22   15.72   ~ 10 0
8 2MASX J01151577+0012483 AGN 01 15 15.781 +00 12 48.44   15.68 15.0     ~ 57 0
9 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2581 2
10 87GB 014542.0+000442 BLL 01 48 16.2556942767 +00 19 44.955370979   18.42 17.71     ~ 23 1
11 QSO J0217+0144 QSO 02 17 48.9547510 +01 44 49.698899   16.74 16.09 18.51 13.29 ~ 383 1
12 2MASX J02532956-0014052 Sy2 02 53 29.598 -00 14 05.58   18.58 17.93 16.39   ~ 16 0
13 2MASX J23322689-0112064 Sy2 23 32 26.895 -01 12 06.47   19.28 18.59     ~ 8 0
14 2MASX J23360380+0004470 Sy1 23 36 03.7443695007 +00 04 47.181047748   21.01 20.10     ~ 10 0
15 QSO B2335-027 QSO 23 37 57.33907287 -02 30 57.6292276   18.1 19.27 18.97   ~ 108 1
16 2MASX J23460911+0059086 Sy2 23 46 09.111 +00 59 08.68   19.30 18.52     ~ 7 0
17 2MASX J23574412-0010298 LIN 23 57 44.1187836805 -00 10 29.947581750   18.16 17.44     ~ 17 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2015A&A...576A..38B and select 'bookmark this link' or equivalent in the popup menu


2021.05.06-00:28:38

© Université de Strasbourg/CNRS

    • Contact