2011A&A...525A..18B


Query : 2011A&A...525A..18B

2011A&A...525A..18B - Astronomy and Astrophysics, volume 525A, 18-18 (2011/1-1)

High-resolution mapping of the physical conditions in two nearby active galaxies based on 12CO(1-0), (2-1), and (3-2) lines.

BOONE F., GARCIA-BURILLO S., COMBES F., LIM J., HO P., BAKER A.J., MATSUSHITA S., KRIPS M., DINH V.T. and SCHINNERER E.

Abstract (from CDS):

We present a detailed analysis of high resolution observations of the three lowest CO transitions in two nearby active galaxies, NGC4569 and NGC4826. The CO(1-0) and (2-1) lines were observed with the Plateau de Bure Interferometer and the CO(3-2) line with the Submillimeter Array. Combining these data allows us to compare the emission in the three lines and to map the line ratios, R21=ICO(2–1)/ICO(1–0) and R32=ICO(3–2)/ICO(1–0) at a resolution of ∼2", i.e., a linear resolution of 160pc for NGC4569 and 40pc for NGC4826. In both galaxies the emission in the three lines is similarly distributed spatially and in velocity, and CO is less excited (R32<0.6) than in the Galactic Center or the centers of other active galaxies studied so far. According to a pseudo-LTE model the molecular gas in NGC4569 is cold and mainly optically thick in the CO(1-0) and (2-1) lines; less than 50% of the gas is optically thin in the CO(3-2) line. LVG modeling suggests the presence of an elongated ring of cold and dense gas coinciding with the inner Lindblad resonance (ILR) of the stellar bar in agreement with a previous analysis of the kinematics. More excited gas is resolved in the circumnuclear disk of NGC4826. According to our pseudo-LTE model this corresponds to warmer gas with a ∼20% of the CO(3-2) emission being optically thin. LVG modeling indicates the presence of a semicircular arc of dense and cold gas centered on the dynamical center and ∼70pc in radius. The gas temperature increases and its density decreases toward the center. A near side/far side asymmetry noticeable in the CO, R32 and Paα maps suggests that opacity effects play a role. Examining published CO maps of nearby active galaxies we find similar asymmetries suggesting that this could be a common phenomenon in active galaxies. These mainly qualitative results open new perspectives for the study of active galaxies with the future Atacama Large Millimeter/submillimeter Array.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: ISM - galaxies: individual: NGC 4569 - galaxies: individual: NGC 4826

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4373 2
2 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1263 3
3 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1458 1
4 NGC 3227 GiP 10 23 30.5765149296 +19 51 54.282206700   12.61 11.79     ~ 1625 1
5 Ton 599 QSO 11 59 31.8338889192 +29 14 43.826803116   14.80 14.41 17.652 13.39 ~ 858 1
6 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6316 0
7 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5598 1
8 M 90 Sy2 12 36 49.8009839880 +13 09 46.523813040 10.56 10.26 9.54     ~ 852 1
9 3C 279 Bla 12 56 11.1663795384 -05 47 21.528432492   18.01 17.75 15.87   ~ 2895 2
10 M 64 SyG 12 56 43.696 +21 40 57.57   9.36 8.52     ~ 884 2
11 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1381 2
12 NAME Centaurus A Sy2 13 25 27.6039817176 -43 01 09.493008456   8.18 6.84 6.66   ~ 4281 3
13 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4113 4
14 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1569 2
15 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13179 0

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2022.09.26-05:11:31

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