2004MNRAS.349.1167S


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST02:33:10

2004MNRAS.349.1167S - Mon. Not. R. Astron. Soc., 349, 1167-1178 (2004/April-3)

A molecular face-on view of the Galactic Centre region.

SAWADA T., HASEGAWA T., HANDA T. and COHEN R.J.

Abstract (from CDS):

We present a method to derive positions of molecular clouds along the lines of sight from a quantitative comparison between 2.6-mm CO emission lines and 18-cm OH absorption lines, and apply it to the central kiloparsecs of the Milky Way. With some simple but justifiable assumptions, we derive a face-on distribution of the CO brightness and corresponding radial velocity in the Galactic Centre without any help of kinematical models. The derived face-on distribution of the gas is elongated and inclined so that the Galactic-eastern (positive longitude) side is closer to us. The gas distribution is dominated by a bar-like central condensation, whose apparent size is 500x200 pc. A ridge feature is seen to stretch from one end of the central condensation, though its elongated morphology might be artificial. The velocity field shows clear signs of non-circular motion in the central condensation. The `expanding molecular ring' feature corresponds to the peripheral region surrounding the central condensation, with the Galactic-eastern end being closer to us. These characteristics agree with a picture in which the kinematics of the gas in the central kiloparsec of the Galaxy is under the strong influence of a barred potential. The face-on distribution of the in situ pressure of the molecular gas is derived from the CO multiline analysis. The derived pressure is found to be highest in the central 100 pc. In this region, the gas is accumulating and is forming stars.

Abstract Copyright: 2004 RAS

Journal keyword(s): ISM: molecules - Galaxy: centre - Galaxy: kinematics and dynamics - radio lines: ISM

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1178 3
2 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1531 2
3 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1389 1
4 NGC 1530 G 04 23 27.102 +75 17 44.05   13.40       ~ 252 1
5 M 61 Sy2 12 21 54.9275149050 +04 28 25.588335799 10.07 10.18 9.65     ~ 873 2
6 NGC 5005 GiP 13 10 56.312 +37 03 32.19   14.67 13.67     ~ 498 2
7 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2233 2
8 NGC 5383 GiG 13 57 04.975 +41 50 46.60   12.5   10.95   ~ 311 0
9 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2552 2
10 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 308 0
11 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 916 0
12 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11613 0
13 NAME Sgr B1 MoC 17 47 02.0 -28 31 57           ~ 124 0
14 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 189 0
15 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1920 1
16 NGC 6951 Sy2 20 37 14.1181441937 +66 06 20.078027288   11.64 10.65     ~ 498 2

    Equat.    Gal    SGal    Ecl

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2020.08.09-02:33:10

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