2016A&A...592A..94F


Query : 2016A&A...592A..94F

2016A&A...592A..94F - Astronomy and Astrophysics, volume 592A, 94-94 (2016/8-1)

A rare example of low surface-brightness radio lobes in a gas-rich early-type galaxy: the story of NGC 3998.

FRANK B.S., MORGANTI R., OOSTERLOO T., NYLAND K. and SERRA P.

Abstract (from CDS):

We study the nearby lenticular galaxy NGC 3998. This galaxy is known to host a low-power radio AGN with a kpc-size one-sided jet and a large, nearly polar HI disc.It is therefore a good system to study to understand the relation between the availability of cold-gas and the triggering of AGNs in galaxies. Our new WSRT data reveal two faint, S-shaped radio lobes extending out to ∼10kpc from the galaxy centre. Remarkably, we find that the inner HI disc warps back towards the stellar mid-plane in a way that mirrors the warping of the radio lobes. We suggest that the polar HI disc was accreted through a minor merger, and that the torques causing it to warp in the inner regions are also responsible for feeding the AGN. The "S" shape of the radio lobes would then be due to the radio jets adapting to the changing angular momentum of the accreted gas. The extended radio jets are likely poorly collimated, which would explain their quick fading and, therefore, their rarity in galaxies similar to NGC 3998. The fuelling of the central super-massive black hole is likely occurring via "discrete events", suggested by the observed variability of the radio core and the extremely high core dominance, which we attribute to the formation and ejection of a new jet resulting from a recent fuelling event.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: active - galaxies: individual: NGC 3998 - ISM: jets and outflows - radio continuum: galaxies - radio lines: galaxies - history and philosophy of astronomy

VizieR on-line data: <Available at CDS (J/A+A/592/A94): list.dat fits/*>

Simbad objects: 25

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Number of rows : 25
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 NGC 326 rG 00 58 22.637 +26 51 58.61   14.9 13     ~ 169 2
2 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2609 2
3 NGC 660 Sy2 01 43 02.350 +13 38 44.45   12.02 11.16     ~ 527 2
4 NGC 1167 LIN 03 01 42.358 +35 12 20.34   13.84 12.77     ~ 313 2
5 NGC 1266 AGN 03 16 00.749 -02 25 38.53   14   12.46   ~ 265 1
6 NGC 1433 GiG 03 42 01.553 -47 13 19.49   10.84 9.99 9.61 10.2 ~ 317 0
7 MCG+05-16-010 AGN 06 52 02.497 +27 27 39.81   14.9       ~ 78 1
8 IC 450 Sy1 06 52 12.32333 +74 25 37.2376   15.16 14.19     ~ 522 1
9 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4081 5
10 NAME UMa Region reg 11 00 +50.0           ~ 318 0
11 NGC 3665 rG 11 24 43.630 +38 45 46.05 13.71 13.26 11.62     ~ 313 1
12 NGC 3801 LIN 11 40 16.897 +17 43 40.48   13.3       ~ 189 1
13 NGC 3972 GiP 11 55 45.09048 +55 19 14.6460   13.14   11.94   ~ 186 1
14 NGC 3982 Sy1 11 56 28.13808 +55 07 30.8424   12.20 11.70 11.18   ~ 506 1
15 UGC 6919 G 11 56 37.49496 +55 37 59.5884   15.19   13.85   ~ 41 0
16 NGC 3990 GiP 11 57 35.592 +55 27 31.81   13.57   12.10   ~ 104 0
17 NGC 3998 SyG 11 57 56.1333561013 +55 27 12.925850484   11.64 12.10 10.09   ~ 593 2
18 UGC 6988 G 11 59 51.894 +55 39 55.12   16.5       ~ 13 0
19 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1676 2
20 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4123 3
21 NGC 5322 SyG 13 49 15.24 +60 11 25.8   11.3       ~ 386 2
22 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 397 0
23 NGC 6328 QSO 17 23 41.02938963 -65 00 36.6113150   13.17 13.2 11.45 12.2 ~ 212 1
24 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2189 2
25 IC 5063 Sy2 20 52 02.329 -57 04 07.60   12.92 13.60 11.30   ~ 572 1

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2021.09.28-03:26:40

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