2011A&A...529A..45V


Query : 2011A&A...529A..45V

2011A&A...529A..45V - Astronomy and Astrophysics, volume 529A, 45-45 (2011/5-1)

Molecular gas in NUclei of GAlaxies (NUGA). XV. Molecular gas kinematics in the inner 3kpc of NGC 6951.

VAN DER LAAN T.P.R., SCHINNERER E., BOONE F., GARCIA-BURILLO S., COMBES F., HAAN S., LEON S., HUNT L. and BAKER A.J.

Abstract (from CDS):

Within the NUclei of GAlaxies (NUGA) project we have obtained IRAM PdBI and 30m 12CO(1-0) and 12CO(2-1) observations of the spiral galaxy NGC6951. Previous work shows that there is indirect evidence of gas inflow from 3kpc down to small radii: a large-scale stellar bar, a prominent starburst ring (r≃580pc) and a LINER/Seyfert 2 nucleus. In this paper we study the gas kinematics as traced by the CO line emission in detail. We quantify the influence of the large-scale stellar bar by constructing an analytical model of the evolution of gas particles in a barred potential. From this model gravitational torques and mass accumulation rates are computed. We compare our model-based gravitational torque results with previous observationally-based ones. The model also shows that the large-scale stellar bar is indeed the dominant force for driving the gas inward, to the starburst ring. Inside the ring itself a nuclear stellar oval might play an important role. Detailed analysis of the CO gas kinematics there shows that emission arises from two co-spatial, but kinematically distinct components at several locations. The main emission component can always be related to the overall bar-driven gas kinematics. The second component exhibits velocities that are larger than expected for gas on stable orbits, has a molecular gas mass of 1.8x106M, is very likely connected to the nuclear stellar oval, and is consistent with inflowing motion towards the very center. This may form the last link in the chain of gas inflow towards the active galactic nucleus in NGC6951.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 6951 - galaxies: nuclei - galaxies: ISM - galaxies: Seyfert

CDS comments: Paragraph 2.1 Calibator 0932+392 is a misprint for QSO B0923+392.

Simbad objects: 17

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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 - 2024
#notes
1 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 999 0
2 NGC 1961 LIN 05 42 04.6327819680 +69 22 42.411028872   11.73 10.99     ~ 337 3
3 NGC 2782 Sy2 09 14 05.1 +40 06 49 12.29 12.30 11.63     ~ 472 3
4 ICRF J092703.0+390220 Sy1 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1001 1
5 NGC 3147 Sy2 10 16 53.6388580752 +73 24 02.641798224   11.43 10.61     ~ 490 2
6 NGC 3718 Sy2 11 32 34.8571790688 +53 04 04.520222040   11.35 10.61     ~ 384 1
7 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5797 1
8 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 897 1
9 M 58 Sy2 12 37 43.5 +11 49 06 10.80 10.48 9.66     ~ 1077 2
10 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 939 2
11 NGC 5953 GiP 15 34 32.4 +15 11 38   13.23 12.45     ~ 369 1
12 NAME Her B Sy1 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1723 2
13 NGC 6574 GiG 18 11 51.2465713056 +14 58 54.747570108   12.5       ~ 179 0
14 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     16.06 15.11   ~ 534 2
15 4C 72.28 BLL 20 09 52.3047264984 +72 29 19.351077612   19.0   19.40   ~ 114 1
16 NGC 6951 Sy2 20 37 14.1228088488 +66 06 20.049916392   11.64 10.65     ~ 526 2
17 NGC 7217 LIN 22 07 52.3984675584 +31 21 33.632293572   12.94 11.92     ~ 494 0

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