Query : 2003A&A...407..515V

2003A&A...407..515V - Astronomy and Astrophysics, volume 407, 515-526 (2003/8-4)

The line-of-sight distribution of the gas in the inner 60 pc of the Galaxy.


Abstract (from CDS):

2MASS KS band data of the inner 60pc of the Galaxy are used to reconstruct the line-of-sight distances of the giant molecular clouds located in this region. Using the 2MASS H band image of the same region, two different populations of point sources are identified according to their flux ratio in the two bands. The population of blue point sources forms a homogeneous foreground that has to be subtracted before analyzing the KS band image. The reconstruction is made using two basic assumptions: (i) an axis-symmetric stellar distribution in the region of interest and (ii) optically thick clouds with an area filling factor of ∼1 that block all light of stars located behind them. Due to the reconstruction method, the relative distance between the different cloud complexes is a robust result, whereas it is not excluded that the absolute distance with respect to Sgr A* of structures located more than 10pc in front of Sgr A* are understimated by up to a factor of 2. It is shown that all structures observed in the 1.2 mm continuum and in the CS(2-1) line are present in absorption. We place the 50km/s cloud complex close to, but in front of, Sgr A*. The 20km/s cloud complex is located in front of the 50km/s cloud complex and has a large LOS distance gradient along the direction of the galactic longitude. The bulk of the Circumnuclear Disk is not seen in absorption. This leads to an upper limit of the cloud sizes within the Circumnuclear Disk of ∼0.06 pc.

Abstract Copyright:

Journal keyword(s): Galaxy: center - ISM: clouds

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 GCM -0.13 -0.08 MoC 17 45 25.2 -29 05 30           ~ 118 1
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13539 0
3 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4086 3
4 GCM -0.02 -0.07 MoC 17 45 50.4 -28 59 06           ~ 158 0

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