2000A&A...363...93H


Query : 2000A&A...363...93H

2000A&A...363...93H - Astronomy and Astrophysics, volume 363, 93-107 (2000/11-1)

Changing molecular gas properties in the bar and center of NGC 7479.

HUETTEMEISTER S., AALTO S., DAS M. and WALL W.F.

Abstract (from CDS):

We present sensitive interferometric 12CO, 13CO and HCN observations of the barred spiral galaxy NGC 7479, one of the few barred galaxies known to have a continuous gas-filled bar. We focus on the investigation and interpretation of 12CO/13CO line intensity ratios R12/13, which is facilitated by having more than 90% of the flux in our interferometer maps. The global (9kpc by 2.5kpc) value of R12/13 is high at 20-40. On smaller scales (∼750pc), R12/13 is found to vary dramatically, reaching values >30 in large parts of the bar, but dropping to values ∼5, typical for galactic disks, at a 13CO condensation in the southern part of the bar. We interpret these changes in terms of the relative importance of the contribution of a diffuse molecular component, characterized by unbound gas that has a moderate optical depth in the 12CO(1-0) transition. This component dominates the 12CO along the bar and is also likely to play an important role in the center of NGC 7479. In the center, the 12CO and the HCN intensity peaks coincide, while the 13CO peak is slightly offset. This can be explained in terms of high gas temperature at the 12CO peak position. Along the bar, the relation between the distribution of 12CO, 13CO, dust lanes and velocity gradient is complex. A southern 13CO condensation is found offset from the 12CO ridge that generally coincides with the most prominent dust lanes. It is possible that strong 13CO detections along the bar indicate quiescent conditions, downstream from the major bar shock. Still, these condensations are found close to high velocity gradients. In the central region, the velocity gradient is traced much more closely by 13CO than by 12CO.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 7479 - galaxies: ISM - galaxies: starburst - radio lines: galaxies

CDS comments: p.94, 3C 454.5 misprint for 3C 454.3 ?

Simbad objects: 20

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Number of rows : 20
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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3123 2
2 NGC 759 GiG 01 57 50.3401939560 +36 20 35.083687128   13.7       ~ 95 1
3 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1592 2
4 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1451 1
5 UGC 2855 H2G 03 48 20.731 +70 07 58.37   14.6       ~ 130 2
6 NGC 1530 G 04 23 27.102 +75 17 44.05   13.40       ~ 265 1
7 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 682 3
8 NGC 2623 LIN 08 38 24.016 +25 45 16.29 14.10 13.99 13.36     ~ 468 1
9 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1050 3
10 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1262 4
11 IC 694 G 11 28 27.312 +58 34 42.29   18.2       ~ 245 2
12 NAME NGC 3690 West GiP 11 28 30.69 +58 33 33.4   11.8       ~ 622 4
13 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 931 4
14 NAME NGC 3690 East AGN 11 28 33.07 +58 33 54.2   11.8       ~ 625 4
15 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1739 2
16 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1894 3
17 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2385 2
18 3C 345 QSO 16 42 58.8102993888 +39 48 37.002763188   16.81 16.59 16.84   ~ 1615 2
19 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1556 2
20 NGC 7479 Sy2 23 04 56.6432243448 +12 19 22.357387020 11.74 11.60 10.85 10.47 9.66 ~ 704 2

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2022.05.20-12:02:44

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