2009A&A...496...85G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET06:45:42

2009A&A...496...85G - Astronomy and Astrophysics, volume 496, 85-105 (2009/3-2)

Molecular gas in NUclei of GAlaxies (NUGA). XI. A complete gravity torque map of NGC 4579: new clues to bar evolution.

GARCIA-BURILLO S., FERNANDEZ-GARCIA S., COMBES F., HUNT L.K., HAAN S., SCHINNERER E., BOONE F., KRIPS M. and MARQUEZ I.

Abstract (from CDS):

In this paper we create a complete gravity torque map of the disk of the LINER/Seyfert 1.9 galaxy NGC 4579. We quantify the efficiency of angular momentum transport and search for signatures of secular evolution in the fueling process from r∼15kpc down to the inner r∼50pc around the active galactic nucleus (AGN). We use both the 1-0 and 2-1 line maps of 12CO obtained with the Plateau de Bure Interferometer (PdBI) as part of the NUclei of Galaxies-(NUGA)-project. The CO(1-0) and CO(2-1) PdBI maps at 2.0"x1.3" and 1.0"x0.6" resolution, respectively, include the short spacing correction provided by IRAM-30 m data. We derive the stellar potential from an NIR (K band) wide field image of the galaxy. The K-band image, which reveals a large-scale stellar bar and a weak nuclear oval, together with a high-resolution Hi map of NGC4579 obtained with the Very Large Array (VLA), allow us to extend the gravity torque analysis to the outer r≥2kpc disk. The bulk of the gas response traced by the new CO PdBI+30m maps of NGC4579 presented here follows the expected gas flow pattern induced by the bar potential in the presence of two inner Lindblad resonances (ILR) at r∼500pc and r∼1.3kpc. The morphology of the outer disk traced by HI suggests that the neutral gas is currently piling up in a pseudo-ring formed by two winding spiral arms that are morphologically decoupled from the bar structure. The pseudo-ring is located inside the bar corotation (rCR∼6kpc) and close to the predicted position of the ultra harmonic resonance (UHR) (rUHR∼3.8kpc). The derived gravity torque budget in NGC 4579 shows that inward gas flow is occurring on different spatial scales in the disk. In the outer disk, the decoupling of the spiral allows the gas to efficiently populate the UHR region, and thus produce net gas inflow on intermediate scales. The corotation barrier seems to be overcome by secular evolution processes. The gas in the inner disk (r≤2kpc) is efficiently funneled by gravity torques down to r∼300pc. Closer to the AGN (r<200pc), gas feels negative torques due to the combined action of the large-scale bar and the inner oval. The two m=2 modes act in concert to produce net gas inflow down to r∼50pc, providing clear smoking gun evidence of inward gas transport on short dynamical timescales (∼1-3 rotation periods).

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4579 - galaxies: ISM - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: Seyfert - radio lines: galaxies

Simbad objects: 11

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Number of rows : 11

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 2782 Sy2 09 14 05.120 +40 06 49.68 12.29 12.30 11.63     ~ 436 3
2 NGC 3147 Sy2 10 16 53.632 +73 24 02.34   11.43 10.61     ~ 432 2
3 NGC 3718 GiP 11 32 34.8527469396 +53 04 04.494313634   11.35 10.61     ~ 351 1
4 Ton 599 QSO 11 59 31.83390975 +29 14 43.8268741   14.80 14.41 17.652 13.39 ~ 813 1
5 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5980 0
6 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5404 1
7 M 90 Sy2 12 36 49.816 +13 09 46.33 10.56 10.26 9.54     ~ 810 1
8 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 985 2
9 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 834 2
10 NGC 6574 GiG 18 11 51.2462161679 +14 58 54.740459628   12.5       ~ 170 0
11 NGC 7217 LIN 22 07 52.368 +31 21 33.32   12.94 11.92     ~ 468 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-06:45:42

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