2005A&A...442..479K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET03:30:36

2005A&A...442..479K - Astronomy and Astrophysics, volume 442, 479-493 (2005/11-1)

Molecular gas in NUclei of GAlaxies (NUGA). III. The warped LINER NGC 3718.

KRIPS M., ECKART A., NERI R., POTT J.-U., LEON S., COMBES F., GARCIA-BURILLO S., HUNT L.K., BAKER A.J., TACCONI L.J., ENGLMAIER P., SCHINNERER E. and BOONE F.

Abstract (from CDS):

We present the first interferometric observations of CO(1-0) and CO(2-1) line emission from the warped LINER NGC 3718, obtained with the IRAM Plateau de Bure Interferometer (PdBI). This L1.9 galaxy has a prominent dust lane and on kiloparsec scales, a strongly warped atomic and molecular gas disk. The molecular gas is closely associated with the dust lane across the nucleus and its kinematic center is consistent with the millimeter continuum AGN. A comparison of our interferometric mosaic data, which fully cover the ∼9kpc warped disk, with a previously obtained IRAM 30m single dish CO(1-0) map shows that the molecular gas distribution in the disk is heavily resolved by the PdBI map. On the nucleus the interferometric maps alone contain less than one half of the single dish line flux, and the overall mosaic accounts for about a tenth of the total molecular gas mass of ∼2.4x108M. After applying a short-spacing correction with the IRAM 30m data to recover the missing extended flux, we find in total six main source components within the dust lane: one associated with the nucleus, four symmetrically positioned on either side at galactocentric distances of about 1.3kpc and 4.0kpc from the center, and a sixth on the western side at ∼3kpc with only a very weak eastern counterpart. In the framework of a kinematic model using tilted rings, we interpret the five symmetric source components as locations of strong orbital crowding. We further find indications that the warp appears not only on kpc scales, but continues down to ∼250pc. Besides the sixth feature on the western side, the lower flux (a factor of ∼2) of the eastern components compared to the western ones indicates an intrinsic large scale asymmetry in NGC 3718 that cannot be explained by the warp. Indications for a small scale asymmetry are also seen in the central 600pc. These asymmetries might be evidence for a tidal interaction with a companion galaxy (large scales) and gas accretion onto the nucleus (small scales). Our study of NGC 3718 is part of the NUclei of GAlaxies (NUGA) project that aims at investigating the different processes of gas accretion onto Active Galactic Nuclei (AGN).

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 3718 - galaxies: active - Galaxy: kinematics and dynamics

CDS comments: Table 2: CO(1-0) components not in SIMBAD

Simbad objects: 9

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Number of rows : 9

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 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3618 3
2 RAFGL 618 pA* 04 42 53.6245215366 +36 06 53.397219192   16.32   12.59   C-rich 962 0
3 ICRF J092703.0+390220 Sy1 09 27 03.0139516273 +39 02 20.847968628   17.17 17.00 16.486   ~ 937 1
4 NGC 3718 GiP 11 32 34.8527469396 +53 04 04.494313634   11.35 10.61     ~ 351 1
5 NGC 3729 GiP 11 33 49.321 +53 07 31.79   12.2       ~ 179 1
6 LB 2136 QSO 11 53 24.46663282 +49 31 08.8301947   17.94 17.66     ~ 434 1
7 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5404 1
8 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 390 2
9 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 720 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-03:30:36

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