2004A&A...413..505L


Query : 2004A&A...413..505L

2004A&A...413..505L - Astronomy and Astrophysics, volume 413, 505-523 (2004/1-2)

Molecular gas in the galaxy M83. I. The molecular gas distribution.

LUNDGREN A.A., WIKLIND T., OLOFSSON H. and RYDBECK G.

Abstract (from CDS):

We present 12CO J=1-0 and J=2-1 Swedish-ESO Submillimetre Telescope (SEST) observations of the barred spiral galaxy M83 (NGC5236). The size of the CO maps is 10'x10' and they cover the entire optical disk. The grid spacing is 11" for CO(J=1-0) and 11" or 7" for CO(J=2-1) depending on the position in the galaxy. In total we have obtained spectra in 1900 and 2574 positions in the CO(J=1-0) and CO(J=2-1) lines, respectively. The CO emission is strongly peaked toward the nucleus, which breaks up into two separate components in the CO(J=2-1) data due to the higher spatial resolution. Emission from the bar is strong, in particular on the leading edges of the bar. The molecular gas arms are clearly resolved and can be traced for more than 360°. Emission in the inter-arm regions is detected. The average CO (J=2-1)/(J=1-0) line ratio is 0.77. The ratio is lower than this on the spiral arms and higher in the inter-arm regions. The arms show regularly spaced concentrations of molecular gas, Giant Molecular Associations (GMA's), whose masses are of the order 107M. The total molecular gas mass is estimated to be 3.9x109M. This mass is comparable to the total HI mass, but H2 dominates in the optical disk. In the disk, H2 and HI show very similar distributions, including small scale clumping. We compare the molecular gas distribution with those of other star formation tracers, such as B and Hα images.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M83, NGC5236 - galaxies: spiral - galaxies: structure - galaxies: ISM - lines: galaxies - galaxies: abundances radio

Simbad objects: 7

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Number of rows : 7
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 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3039 2
2 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1421 1
3 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3947 4
4 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2310 2
5 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1288 4
6 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2631 2
7 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2319 2

    Equat.    Gal    SGal    Ecl

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2021.07.29-17:46:13

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